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Honda UMK422 User's Manual

1. 11 SEQ CHE 11 lonion SWOR iie sosta cil bbs FRI HER PERLE DR LIUC ainis 11 Operator Presence Lever 11 Throttle SERERE E ITE 11 Throttle Set Button eese nemen 12 BUD e c 12 Recoil Starter Grip suse eren r rona Dirt we si 12 EQUIPMENT 13 Shoulder Harness 13 Safety Glasses 13 OWS 14 Physical and Mental Readiness 14 Protective Clothing 14 IS YOUR WORKING AREA READY 14 IS YOUR TRIMMER READY TO 0 15 Safety Inspection m 15 Cutting Attachment Inspection 15 Maintenance Inspection 15 ARE YOUR SHOULDER HARNESS AND TRIMMER CORRECTLY ADJUSTED 16 Adjusting the Harness 16 Balancing the Trimmer on the Shoulder Harness 16 OPERATION SAFE OPERATING PRECAUTIONS 17 STARTING THE ENGINE 1f STOPPING THE ENGINE
2. ENGINE OPERATING PROBLEMS Low Power or Engine Possible Cause Correction Speed Won t Increase Check air filter Filter dirty or clogged Check clean or replace air filter Check fuel filter Filter dirty or clogged Replace fuel filter Check throttle cable Out of adjustment broken or Adjust cable or replace if bent necessary Check spark arrester screen clogged 44 TAKING CARE OF UNEXPECTED PROBLEMS CUTTING HEAD PROBLEMS Blade or Cutting line Possible Cause Correction head won t stop turning when throttle is at SLOW position Check throttle control and Fault in throttle control or cable Check throttle control parts adjust cable throttle cable out of adjustment or replace cable if necessary bent Idle speed is too fast Adjust idle speed Check clutch Clutch springs broken or worn or Replace clutch springs or replace or clutch system faulty repair other clutch system parts Blade or d Possible Won t Turn Check clutch drive shaft or broken clutch broken Replace or repair faulty and gearbox shaft worn or broken gearbox components as needed parts Excessive Vibration Possible Cause Cormection Check cutting line head or Cutting line head or blade nut Tighten cutting line head or blade blade nut loose nut securely Check blade Blade damaged Replace blade 45 TECHNICAL amp CONSUMER INF
3. 19 TRIMMER HARNESS QUICK DISCONNECTION 19 TRIMMER 19 Operating Position eclesie nnn 19 Throttle Operation 20 Using a Nylon Cutting Line Head 20 Usna 2 c 21 SAFE OPERATING PRACTICES 21 Thrown DoDriS 21 Blade Thrust Kickback 22 OPERATING TIPS Pau vu C deis 22 eee TD 22 OPERATION continued Trimming and Edging 23 Brush Clearing e 23 Operation on Slopes eene annee neenon nans 23 MAINTENANCE SAFETY _ 24 MAINTENANCE SCHEDULE 25 conto A AAEE 26 Engine Oil Level Check eere 26 Engine CHANGE E 26 Engine Oil Recommendations 27 Filter 27 Air Filter Cleaning Me 27 Spark Plug Service 28 Spark Arrester Service eese eene 29 Cooling Fin Inspection 30 Throttle Cable Inspection 30 Throttle Cable Adjustment
4. p e O Manual feed Medie f o e o e e _ Semiautomatic Saw blade optional requires optional requires optional Barrier Kit optional Barrier Kit DIMENSIONS installed Length Manual feed head 6 15 feet 1 875 m Semiautomatic feed head 6 18 feet 1 885 m U type 6 27 feet 1 91 m 13 6 in 345 mm U type 10 4 in 265 mm f 8in 4dfmm 9 Ib 6 3 kg Dry weight 13 9 Ib 6 3 kg 15 0 Ib 6 8 kg Uype O 15 7 Ib 7 1 kg with saw blade installed 23 8 in 605 mm 90 TECHNICAL amp CONSUMEH INFORMATION wem 0 a oa 4 stroke overhead valve single cylinder 0 8 Ibf ft 1 09 Nem 0 11 kgfm at 1 23 Ibf ft 1 64 Nem 0 17 kgf m at 4 500 rpm 4 500 rpm Transistorized magneto Unleaded gasoline 86 octane or higher Lo UMK2XMi UMK431K1 Two motion trigger style 1 02 in 26 mm 0 08 in 2 0 mm solid 0 28 in 7 mm 7 1 33 Tuneup MAINTENANCE ITEM SPECIFICATION Spark plug gap 0 024 0 028 in Refer to page 28 0 60 0 70 mm Valve clearance cold Intake 0 12 0 02 mm your authorized Exhaust 0 15 0 02 mm Honda dealer Other specifications No other adjustments needed 51 TECHNICAL amp CONSUMER INFORMATION CONSUMER INFORMATION Honda Publications Two other documents are available from your Honda
5. Running the engine with too little or too much oil can cause engine damage 4 Screw in the filler cap dipstick securely Engine Oil Change Drain the used oil while the engine is warm Warm oil drains quickly and completely 1 Place a suitable container below the engine to catch the used oil then remove the filler cap dipstick and drain the used oil through the filler opening Allow the used oil to drain completely Improper disposal of engine oil can be harmful to the environment If you change your own oil please dispose of the used oil properly Put it in a sealed container and take it to a recycling center Do not discard it in a trash bin or dump it on the ground SAN A DPX VAN ey 3 With the engine in an upright position fill to the edge of the oil filler hole with the recommended oil see pag Engine oil capacity 0 11 US qt 3 38 fl oz 0 1 9 4 Screw in the filler cap dipstick securely 26 SERVICING YOUR HONDA TRIMMER Engine Oil Recommendations Oil is a major factor affecting performance and service life Use 4 stroke automotive detergent oil SAE 10W 30 is recommended for all temperatures within the recommended operating range for these trimmers The recommended operating range extends from 23 F 5 C to 104 F 40 The SAE oil viscosity and service classification are in the API label on the oil container Honda recommends that you use SERVICE category SJ
6. eeeeeeeeeneneee 30 FUEL SYSTEM 31 xiii TRUE 31 Fuel Recommendations 31 Fuel Filter and Fuel Tank Cleaning 32 CUTTING 33 Cutting Line Heads eere eene nennen 33 FOS acs ees A 39 STORAGE STORAGE PREPARATION 41 IB ARTI DEF ternis Ue 41 go M 9 94 41 me 42 Carburetor amp Air 42 gt 42 Engine VIMO gc 42 STORAGE PRECAUTIONS 42 REMOVAL FROM STORAGE 42 TRANSPORTING TAKING CARE OF UNEXPECTED PROBLEMS 44 STARTING PROBLEMS 44 ENGINE OPERATING 5 44 CUTTING HEAD PROBLEMS 45 TECHNICAL amp CONSUMER INFORMATION 46 TECHNICAL INFORMATION 46 Serial Number Locations 46 Carburetor Modification for High Altitude Opera
7. Before you ask anyone to operate this trimmer brush cutter you need to determine whether the person is old enough large enough and strong enough to safely handle and control the trimmer brush cutter If you decide he or she is make sure the employee reads and understands all instructions and warnings in this manual and on the labels before operating the trimmer brush cutter Allow adequate time for hands on training by a qualified instructor and personally supervise practice sessions until you feel sure the employee is ready to operate the trimmer brush cutter Also be sure employees wear proper clothing eye and hearing protection and any other gear that may be required by local ordinances or your insurance company Hemember too that you are responsible for keeping the trimmer brush cutter properly maintained and in safe operating condition Your commitment to safety on the job can help prevent accidents and result in longer and more productive years of service TRIMMER SAFETY SAFETY LABEL LOCATIONS The labels shown here contain important safety information Please read them carefully These labels are considered permanent parts of your trimmer brush cutter If a label comes off or becomes hard to read contact an authorized Honda servicing dealer for a replacement READ AND FOLLOW OWNER S MANUAL Failure to do so can result in serious injury to the operator and bystanders OBJECTS THROWN BY C
8. UWI er s Manual TRIMMER BRUSH CUTTER UMK422 UMK431 PN FAA FER SS _ TTS M BRE hee KS 2 I K 1 20 SS Z NE J Qe pm m LET E i A WARNING A The engine exhaust from this product contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm Keep this owner s manual handy so you can refer to it at any time This owner s manual is considered a permanent part of the trimmer brush cutter and should remain with the trimmer brush cutter if resold The information and specifications included in this publication were in effect at the time of approval for printing Honda Motor Co Ltd reserves the right however to discontinue or change specifications or design at any time without notice and without incurring any obligation whatever No part of this publication may be reproduced without written permission INTRODUCTION Congratulations on your selection of a Honda trimmer brush cutter We are certain you will be pleased with your purchase of one of the finest trimmers brush cutters on the market We want to help you get the best results from your new trimmer brush cutter and to operate it safely This manual contains the information on how to do that please read it carefully As you read this manual you will find information preceded by a NOTICE symbol That information is intended to hel
9. 1 1 TI pas I 59 Nuts bolts fasteners Check Retighten if necessary TOTTI 22 NO E Replace Spark arrester Clean Fuel filter Check Fuel tank Clean Fuel tubes Check Every 2 years Replace if necessary 2 Y T E gt ejeje jef f o 2 amp zi i e Emission related items 1 2 eee Service more frequently when used in dusty areas bod These items should be serviced by your servicing dealer unless you have the proper tools and are mechanically proficient Refer to the Honda shop manual for service procedures 3 nri Log hours of operation to determine proper maintenance intervals 2 SERVICING YOUR HONDA TRIMMER ENGINE Engine Oil Level Check FILLER OPENING Check the engine oil level before each use or every 10 hours if operated continuously Rest the trimmer on a level surface with the engine stopped and in an upright position 1 Remove the filler cap dipstick and wipe it clean 2 Insert and remove the dipstick without screwing it into the filler opening Check the oil level shown on the dipstick FILLER CAP DIPSTICK 3 If the oil level is low fill to the edge of the oil filler hole with the recommended oil see page 27 To avoid overfilling or underfilling be sure the engine is in a level position as shown OIL LEVEL
10. bolts securely Torque the bolts to Vy 5 mm 2 5 3 4 Nem 0 34 kgf m RO OM WASHERS 0 4 DEFLECTOR V7 DEFLECTOR PLATE PLATE 5 mm WASHERS 4 Wy EA 5 DEFLECTOR AN SPACER WON DEFLECTOR NS x SPACER 5 40 6 gi amp BRUSH WOOD BLADE DEBRIS SHIELD CUTTING LINE GREATER BLADE DEBRIS SHIELD STORAGE STORAGE PREPARATION Proper storage preparation is essential for keeping your trimmer troublefree and looking good The following steps will help to keep rust and corrosion from impairing your trimmer s function and appearance and will make the engine easier to start when you use the trimmer again Cleaning Wash the trimmer including the area around the trimmer head Wash the engine by hand and be careful to prevent water from entering the air cleaner Using a garden hose or pressure washing equipment can force water into the air cleaner Water in the air cleaner will soak the filters and can enter the carburetor or engine causing damage Water on a hot engine can cause damage If the engine has been running allow it to cool for at least 1 2 hour before washing If using a garden hose or pressure washing equipment to clean the trimmer be careful to avoid getting water into controls and cable or anywhere near the engine air cleaner or muffler opening Before washing the trimmer head area disconnect the spark plug cap After washing the trimmer wipe dry all acc
11. or loose string away from the drive bolt and the gear case 5 Separate the two halves drum and spool of the trimmer head then remove any remaining nylon line from the spool 6 Measure about 12 feet 3 7 meters of new line then thread one end through the eyelet on the spool Pull the line until the two lengths are equal 7 Hold the spool in your hand by the manual feed grip Wind both lines together around the spool turning the spool in the direction shown by the arrow 8 When winding it is important not to allow the two lines to cross over each other Position a finger between the lines as you turn the spool to prevent the lines from becoming crossed 34 DRUM THREE SIDED KNOB TENSION SPRING NYLON LINE EYELET Rotate spool to wind line la YX NYLON LINE 10 11 12 13 SERVICING YOUR HONDA TRIMMER When you have about 6 inches 150 mm of line remaining press the lines into the two notches on the bottom of the spool as shown This will hold the line on the spool for reassembly Guide the ends of the lines through the metal eyelets on the drum Push the spool into the drum but be careful not to let any line get trapped outside the edges of the spool Hold the drum and spool firmly then pull each NYLON LINE line until you hear it snap out of the notch It is METAL EYELET okay if one line is longer than the other Once each line has snapped out press th
12. cutting lines can cause serious abrasions and cuts and blades can cut deeply e Keep away from the cutting lines or blade whenever the engine is running e Always stop the engine and be sure the cutting line head or blade has stopped turning before inspecting or handling the cutting lines or blade Thrown Debris The trimmer will throw debris in the direction of blade movement at the point of contact The cutting line head or blade on Honda UMK422 and UMK431 trimmers rotates counterclockwise as viewed from the operator s position so tilting the cutting line head to the right will throw debris away from you and tilting to the left will throw debris toward you DEBRIS il Cut with the right side to throw debris away from you If the cutting line head or blade is held parallel to the ground debris will scatter in all directions and there will be greater friction which will wear out the cutting line or blade sooner When operating the trimmer near a hard surface such as a wall work from an angle where debris that strikes the hard surface will ricochet away from you Gravel loose stones etc can be picked up by the nylon cutting lines or blade and thrown many feet with enough force to cause serious personal injury and or property damage Before crossing graveled areas release the throttle trigger to stop the cutting line head or blade 21 OPERATION Blade Thrust Kickback Blade t
13. dealer There is a Shop Manual which covers complete maintenance and overhaul procedures It is intended to be used by a skilled technician There is also a Parts Catalog that provides a complete illustrated parts lists Warranty Service Information Honda Power Equipment dealership personnel are trained professionals They should be able to answer any question you may have If you encounter a problem that your dealer does not solve to your satisfaction please discuss it with the dealership s management The Service Manager or General Manager can help Almost all problems are solved in this way If you are dissatisfied with the decision made by the dealership s management contact the Honda Power Equipment Customer Relations Office You can write American Honda Motor Co Inc Power Equipment Division Customer Relations Office 4900 Marconi Drive Alpharetta Georgia 30005 8847 Or telephone 770 497 6400 When you write or call please give us this information Model and serial numbers see page 46 Name of the dealer who sold the trimmer to you Name and address of the dealer who services your trimmer Date of purchase Your name address and telephone number A detailed description of the problem 52 QUICK REFERENCE SECTION Fuel Unleaded gasoline with pump octane rating of 86 or higher 0 48 US qt 15 2 fl oz 0 45 0 0 69 US 22 0 fl oz 0 65 Engine oil SAE 10W 30 5 page 27 0 11 US qu3 38 fl oz 0
14. oil Air Filter Inspection Press the air cleaner latch tab and remove the air cleaner cover Check the filter to be sure it is clean and in good condition If the filter is dirty clean it as described under Air Filter Cleaning Replace the filter if it is damaged Reinstall the filter and air cleaner cover Operating the engine without an air filter or with a damaged air filter will allow dirt to enter the engine causing rapid engine wear This type of damage is not covered by the Distributor s Limited Warranty Air Filter Cleaning A dirty air filter will restrict air flow to the carburetor reducing engine performance If you operate the engine in very dusty areas clean the air filter more often than specified in the MAINTENANCE SCHEDULE FILTER 1 Clean the air filter in warm soapy water rinse and allow to dry thoroughly Or clean in nonflammable solvent and allow to dry 2 Dip the air filter in clean engine oil then squeeze out all excess oil The engine will smoke when started if too much oil is left in the filter 3 Wipe dirt from the air cleaner base and cover using a moist rag Be careful to prevent dirt from entering the carburetor RETAINING TABS AIR CLEANER COVER 27 SERVICING YOUR HONDA TRIMMER Spark Plug Service Recommended Spark plugs CR5HSB NGK U16FSR UB DENSO Incorrect spark plugs can cause engine damage SPARK PLUG 1 Disconnect the spark plug cap and remove any
15. operated other trimmers take time to become familiar with the operation of this trimmer s controls and handling For your safety avoid starting or operating the engine in an enclosed area such as a garage Your engine s exhaust contains poisonous carbon monoxide gas which can collect rapidly in an enclosed area and cause illness or death If the trimmer starts to shake or vibrate stop the engine immediately After the cutting head has completely stopped inspect it to determine the cause of the vibration Sudden vibration is a sign of a hazardous problem such as a loose or damaged cutting attachment Do not operate the trimmer until the problem is corrected Prolonged exposure to vibration may cause vibration syndrome Raynaud s disease Symptoms include loss of skin color in the hands and numbness or a painful tingling sensation in the fingers hands and arms Regular users of any power equipment may feel the numbness or pain spontaneously at any time not just after using the equipment If any of the symptoms occurs see a physician immediately STARTING THE ENGINE FUEL RETURN TUBE CHOKE LEVER clear plastic tube 1 To start a cold engine move the choke lever to the CLOSED position To restart a warm engine leave the choke lever in the OPEN position 2 Press the priming bulb repeatedly until fuel can be seen in the clear plastic fuel return tube 3 Set the throttle trigger in the starting position using the throttle se
16. plug cap from the spark 5 x 18 mm BOLTS plug Pull the spark plug wire and the ignition switch wire out of the retainers in the top cover RETAINERS SST a TN ne 3 Remove the two 5 x 22 mm bolts from the top JS cover and remove the top cover ee P 4 K GAS X 4 Remove the three 5 mm screws from the CA J muffler cover and remove the muffler cover p WIRE IGNITION 5 Remove the 4 mm screw from the spark SWITCH arrester and remove the spark arrester WIRE 6 Use a brush to remove carbon deposits from the spark arrester screen Be careful to avoid damaging the screen The spark arrester must be free of breaks and holes Replace the spark arrester if it is damaged 7 Install the spark arrester muffler cover top cover and recoil starter in the reverse order of disassembly SPARK ARRESTER SCREEN MUFFLER 5 x 16 mm SCREW SPARK ARRESTER MUFFLER COVER 5 x 10 mm SCREW 4 mm SCREW 5 x 10 mm SCREW 29 SERVICING YOUR HONDA TRIMMER Cooling Fin Inspection ENGINE COOLING FINS Inspect the engine cooling fins and clean out dirt and debris if they are clogged If itis necessary to remove the top cover for better access to the cooling fins follow disassembly steps 1 through 3 on Throttle Cable Inspection Verify that the throttle trigger operates smoothly and the throttle cable is undamaged If there is visible damage or if the throttle trigger does not oper
17. the service life of your equipment it is very important to take a few moments before you operate the trimmer to check its condition Be sure to take care of any problem you find or have your servicing dealer correct it before you operate the trimmer AWARNING Improperly maintaining this trimmer or failing to correct a problem before operation could cause a malfunction in which you could be seriously injured Always perform a preoperation inspection before each operation and correct any problem Safety Inspection e Look around the engine for signs of oil or gasoline leaks Wipe up any spills before starting the engine e Replace any damaged parts e Check that all fasteners are in place and secure Tighten as necessary Cutting Attachment Inspection Look for signs of damage to the cutting attachment ei rerom and 89 Replace any cutting attachment and parts that are worn out bent cracked chipped or damaged in any way If using a metal blade be sure it is sharp A dull blade is more likely to snag and thrust If using a metal blade on a trimmer equipped with a loop handle be sure the barrier bar optional part is installed beneath the loop handle Make sure the cutting attachment is properly installed and securely fastened see and 40 40 Check that the debris shield is the correct shield for the cutting attachment 9 and that it is securely installed and in good condit
18. 0 105 inch diameter nylon line Do not use any kind of metal wire or Cutting Line Heads wire rope line on the trimmer Use only genuine Honda replacement nylon trimmer line or the All Honda trimmers come with either a manual or semiautomatic cutting head Read this section to learn how to inspect install new line and remove and install a cutting head from the trimmer equivalent inspection Make sure the nylon line is only sticking out of the metal eyelets on the head If any of the line has come off the spool follow the Installing Replacement Nylon Line instructions in this section to disassemble the spool and replace the line Examine the entire head area including the debris shield and clear or clean it free from dirt debris loose string wire or any other foreign materials For the manual feed head make sure the three sided knob is correctly tightened page 35 For the semiautomatic head veri e spool cover is locked in place For both head styles check for any cracks in the plastic and replace any damaged parts 33 SERVICING YOUR HONDA TRIMMER Manual Feed Cutting Line Head 1 Clean any mud dirt debris etc from the area around the trimmer head otherwise it will make it more difficult to service 2 Remove the three sided knob it has a left hand thread so turn it clockwise to remove Hemove the tension spring 3 Remove the trimmer head from the drive bolt 4 Clean any debris dirt
19. 1 2 Spark plug Type NGK CR5HSB DENSO U16FSR UB Electrode gap 0 024 0 028 in 0 60 0 70 mm Carburetor Idle speed 3 100 200 rpm Maintenance Before each use Check engine oil 26 Check air filter page 27 Check throttle cable page 30 Check cutting attachment pages 33 and 39 Check debris shield pages 33 and 39 Check nuts bolts fasteners Check shoulder harness quick release page 19 First 10 hours Change engine oil Subsequent Refer to the Maintenance Schedule on page 25 1188 n 488 0 0 4 6 ir BENEEEEEEEEEEEEEEENE BENEEEEEEEEEEEEEEENE IEEE 1 1 SEER FEE EEE EEE EE EE EE EEE EE EEE EE EEE 14 17 EE 0 BEREEEEEEREEEREREESEEESEEEESEEEEEEEEERL E
20. ASE LATCH SAFETY GLASSES ANSI Z87 1 13 BEFORE OPERATION ARE YOU READY TO OPERATE THE TRIMMER Your safety is your responsibility A little time spent in preparation will significantly reduce your risk of injury Knowledge Read and understand this manual Know what the controls do and how to operate them Familiarize yourself with the trimmer and its operation before you begin to use it Know what to do in case of emergencies Physical and Mental Readiness You must be alert and in good physical condition to operate the trimmer Do not operate the trimmer if you are tired ill or under the influence of alcohol medication or any substance that might impair your vision dexterity or judgment If you have any physical problem that may be aggravated by strenuous work consult your physician before operating the trimmer Protective Clothing Wearing protective clothing will reduce your risk of injury Do not wear loose clothing jewelry short pants sandals or go barefoot Secure hair SO it is above shoulder level Eye Face and Head Protection Always wear safety glasses or goggles that comply with ANSI standard Z87 1 to protect your eyes from thrown objects Prescription glasses may be worn under the safety glasses or goggles A helmet with a face shield is recommended for further protection However safety glasses or goggles should always be worn under the face shield Do not rely on a face shield alo
21. Cleaning 1 Remove the fuel tank cap and empty the fuel tank into an approved gasoline container Use a funnel to avoid spilling gasoline 2 Pull the fuel filter out through the fuel filler neck by hooking the black fuel supply tube with a piece of wire such as a partly straightened paper clip 3 Inspect the fuel filter If the fuel filter is dirty wash it with nonflammable solvent Be careful to avoid damaging the filter Replace the filter if it is damaged or excessively dirty 4 Rinse sediment from the fuel tank with nonflammable solvent 5 Insert the fuel filter in the fuel tank and install the fuel tank cap FUEL SUPPLY TUBE black 32 SERVICING YOUR HONDA TRIMMER CUTTING ATTACHMENTS installing Replacement Nylon Line There are several cutting attachments for your First determine which cutting line head style is on trimmer Use the following section to inspect your trimmer A manual feed trimmer head has a remove service and install a standard factory three sided knob on the bottom of the head while installed cutting attachment the semiautomatic head has a spring loaded round button on the bottom of the head Always turn the engine switch to the OFF position and disconnect the spark plug cap Use only the line size specified for the trimmer before performing any inspection adjustment or head For original factory installed Honda cutting maintenance on the trimmer line heads use 0 095 or
22. GER You WILL be KILLED or SERIOUSLY HURT if you don t follow instructions WARNING You CAN be KILLED or SERIOUSLY HURT if you don t follow instructions mee You CAN be HURT if you don t follow instructions e Safety Headings such as IMPORTANT SAFETY INFORMATION e Safety Section such as TRIMMER SAFETY e Instructions how to use this trimmer brush cutter correctly and safely This entire book is filled with important safety information please read it carefully CONTENTS TITO TT 5 PAOCITICATIONS enri 5 IMPORTANT MESSAGE TO EMPLOYERS 5 SAFETY LABEL LOCATIONS eene 6 RECOMMENDED CUTTING ATTACHMENTS 7 CUTTING LINE HEADS AND SHIELD 7 Manual Feed Cutting Line Head 7 Semiautomatic bump feed Cutting Line Head 7 BLADES AND SHIELD cerne 8 Grass Weed Blades 8 Weedj Brush 5 8 Brush Wood Blades sis cicssaiecsssvidsavsesssacesseastncesoseseet atasioncecdorsse 8 Brush Wood Blade Cover Installation and Removal 9 CUTTING ATTACHMENT APPLICATIONS 9 CONTROLS amp EQUIPMENT COMPONENT amp CONTROL LOCATIONS 10 e cm
23. ORMATION TECHNICAL INFORMATION This section contains important information about serial number locations operation at high altitudes oxygenated fuels and emissions control systems Serial Number Locations There are two serial numbers one for the trimmer and another for the engine Record these numbers in the space provided You ll need to have these numbers available when ordering parts or making technical or warranty inquires page 52 Frame serial number Engine serial number IN ENGINE SERIAL NUMBER 46 Carburetor Modifications for High Altitude Operation At high altitude the standard carburetor air fuel mixture will be too rich Performance will decrease and fuel consumption will increase A very rich mixture will also foul the spark plug and cause hard starting High altitude performance can be improved by specific modifications to the carburetor If you always operate your trimmer at altitudes above 5 000 feet 1 500 meters have your servicing dealer perform this carburetor modification Even with carburetor modification engine horsepower will decrease about 3 5 for each 1 000 foot 300 meter increase in altitude The effect of altitude on horsepower will be greater than this if no carburetor modification is made When the carburetor has been modified for high altitude operation the air fuel mixture will be too lean for low altitude use Operation at altitudes below 5 000 feet 1 500 me
24. UIPMENT Throttle Set Button The throttle set button is used to hold the throttle trigger at the fast idle position for starting Do not allow the cutting line or blade to contact any obstruction when starting the engine with the throttle button engaged To engage the throttle set button press the operator presence lever by gripping the control handle pull the throttle trigger then press and hold the throttle set button while releasing the throttle trigger To disengage the throttle set button simply pull the throttle trigger The throttle set button automatically disengages when the throttle trigger is pulled Do not use the throttle set button while operating the trimmer The trimmer will not return to idle and the cutting line head or blade will continue to spin until the set button is disengaged and the throttle trigger is released Priming Bulb Pressing the priming bulb pumps fuel from the fuel tank to the carburetor This procedure is necessary for starting the engine To ensure that fuel has reached the carburetor press the priming bulb repeatedly until fuel can be seen in the clear plastic fuel return tube Recoil Starter Grip Pulling the starter grip operates the recoil starter to turn the engine for starting 12 THROTTLE SET BUTTON THROTTLE TRIGGER OPERATOR PRESENCE LEVER FUEL RETURN TUBE clear plastic tube CONTROLS amp EQUIPMENT EQUIPMENT Honda UMK422 and UMK431 trimme
25. UTTING ATTACHMENTS CAN CAUSE SERIOUS INJURY E Always wear eye protection that meets ANSI 287 1 B Always wear hearing protection and protective clothing B Keep bystanders at least 50 feet 15m away B Do not operate without shield WARNING CONTACT WITH ROTATING CUTTING ATTACHMENT CAN CAUSE SERIOUS INJURY E Keep away from rotating cutting attachment E Be aware of possible kickback when using blades See Owner s Manual for special operating precautions E Install proper shield handle and harness for cutting attachment E Use only Honda recommended cutting attachments __ TYPES EQUIPPED WITH U TYPE HANDLEBAR TYPES EQUIPPED WITH LOOP HANDLE RECOMMENDED CUTTING ATTACHMENTS CUTTING LINE HEADS AND SHIELD A cutting line head containing nylon monofilament line and a debris shield with cutoff knife is standard equipment The shield s cutoff knife automatically removes any excess line that is released from the cutting head Honda UMK431UNBA trimmers are supplied with two different debris shields Use the debris shield with the cutoff knife when the cutting line head is installed Nylon monofilament line is suitable for cutting grass and ordinary weeds but not brush and woody growth Manual Feed Cutting Line Head Line is released from the cutting head by manually pulling and turning the spool with the trimmer stopped Semiautomatic bump feed Cutting Line Head Line is relea
26. WITH CUTOFF KNIFE 10 CONTROLS amp EQUIPMENT CONTROLS Choke Lever The choke lever opens and closes the choke valve The CLOSED position enriches the fuel mixture for starting a cold engine The OPEN position provides the correct fuel mixture for operation after starting and for restarting a warm engine Ignition Switch The ignition switch controls the ignition system The ignition switch button must be in the ON 1 position for the engine to start and run Moving the ignition switch button to the OFF O position stops the engine Operator Presence Lever The operator presence lever blocks the throttle trigger This safety feature prevents unintentional throttle operation if the trimmer is bumped while the operator s hand is not on the control handle When the operator presses the presence lever by gripping the control handle the trigger moves freely Throttle Trigger The throttle trigger controls engine speed Pulling the throttle trigger toward the grip increases engine speed The trimmer will have the greatest cutting force at maximum engine speed Releasing the throttle trigger reduces engine speed At idle the cutting line head or blade should coast to a stop CHOKE LEVER U type handle Loop handle IGNITION SWITCH BUTTON THROTTLE TRIGGER OPERATOR PRESENCE LEVER IDLE cutting attachment stops FAST cutting attachment rotates 11 CONTROLS amp EQ
27. aler has cutting attachments that have been designed and approved for your trimmer and are covered by a warranty Non Honda attachments are usually designed for universal applications Although aftermarket attachments may fit on your trimmer they many not meet factory specifications and could make your trimmer unsafe 39 SERVICING YOUR HONDA TRIMMER 1 Install the protective plastic cover that came with the blade on the blade Insert the tip of the 4 mm hexagon wrench supplied with your trimmer fully into the hole on the gear case 4 mm HEXAGON WRENCH 3 Turn the blade until you feel the tool drop into DRIVE BOLT ponen the hole in the internal locking ring Verify the blade does not turn The drive bolt and blade ROME ME nut use left handed threads Make sure the universal tool remains in the hole then loosen turn clockwise the blade nut Pay attention to the order and orientation of the parts as they LOCK RING are removed ALL BLADE 4 Installation is the reverse of removal Make sure GLIDE CUP you install the blade with the cutting edges in the direction of rotation Be sure to align the hole in the blade with the shoulder on the BLADE NUT spacer Torque the blade nut to 14 Serie 19 Nem 2 0 Changing the Debris Shield 5 x 30 mm 5 x 30 mm Refer to the applicable illustration for removing BOLTS 4 BOLTS 4 and installing the debris shields 39 Tighten
28. also damage metal rubber and plastic parts of your fuel system If you notice any undesirable operating symptoms try another service station or switch to another brand of gasoline Fuel system damage or performance problems resulting from the use of an oxygenated fuel containing more than the percentages of oxygenates mentioned above are not covered under warranty 47 TECHNICAL amp CONSUMER INFORMATION Emissions Control System Information Source of Emissions The combustion process produces carbon monoxide oxides of nitrogen and hydrocarbons Control of hydrocarbons and oxides of nitrogen is very important because under certain conditions they react to form photochemical smog when subjected to sunlight Carbon monoxide does not react in the same way but it is toxic Honda utilizes lean carburetor settings and other systems to reduce the emissions of carbon monoxide oxides of nitrogen and hydrocarbons The U S and California Clean Air Acts EPA and California regulations require all manufacturers to furnish written instructions describing the operation and maintenance of emissions control systems The following instructions and procedures must be followed in order to keep the emissions from your Honda engine within the emissions standards Tampering and Altering Tampering with or altering the emissions control system may increase emissions beyond the legal limit Among those acts that constitute tampering a
29. ate smoothly have your Honda servicing dealer replace the throttle cable Check the free play at the end of the throttle cable Free play should be 1 16 1 8 in 1 0 3 0 mm If adjustment is needed use the following cable adjustment procedure 6 1 16 1 8 in 1 0 3 0 mm Throttle Cable Adjustment ADJUSTING NUT 1 Loosen the lock nut with a 10 mm wrench and turn the adjusting nut to obtain the specified free play 2 Tighten the lock nut and recheck cable free play 30 SERVICING YOUR HONDA TRIMMER FUEL SYSTEM Refueling Fuel tank capacities UMK422 0 48 US qt 15 2 fl oz 0 45 2 UMKA31 0 69 US qt 22 0 fl oz 0 65 2 Check the fuel level by looking through the translucent fuel tank If the fuel level is low refuel in a well ventilated area with the engine stopped If the engine has been running allow it to first To refuel rest the trimmer on the ground with the fuel tank cap facing up as shown Remove the fuel tank cap and fill the tank with gasoline to the bottom of the filler neck Refuel carefully to avoid spilling fuel Do not overfill There should be no fuel in the filler neck After refueling tighten the fuel tank cap securely AWARNING Gasoline is highly flammable and explosive You can be burned or seriously injured when handling fuel e Stop the engine and keep heat sparks and flame away e Handle fuel only outdo
30. carefully inspect the area and remove all broken glass pieces of wire and other loose objects Keep the Trimmer Properly Maintained e The cutting attachment should be examined for looseness cracks broken parts or excessive wear Tighten or replace as needed before operating the trimmer e Do not operate the trimmer without a debris shield properly installed Make sure you have the right shield installed for your cutting attachment For more information see page 7 TRIMMER SAFETY ATTACHMENTS amp MODIFICATIONS Modifying your trimmer brush cutter or installing non Honda attachments can make your trimmer unsafe Before you make any modifications or install any attachments be sure to read the following information Attachments Your Honda trimmer servicing dealer has cutting attachments debris shields barrier kits and shoulder harnesses that have been designed and approved for your trimmer and are covered by warranty Non Honda attachments are usually designed for universal applications Although aftermarket attachments may fit on your trimmer they may not meet factory specifications and could make your trimmer unsafe Modifications Do not remove the debris shield or modify your trimmer in any way that would alter its design or operation This could make your trimmer unsafe IMPORTANT MESSAGE TO EMPLOYERS As an employer you have special responsibilities to the people who work for you
31. dirt from around the spark plug area 2 Remove the spark plug with a 5 8 inch spark plug wrench 3 Inspect the spark plug Replace it if the electrodes are worn or if the insulator is cracked or chipped Clean the spark plug with a wire brush if you are going to reuse it SPARK PLUG CAP 4 Measure the spark plug electrode gap with a suitable gauge The gap should be 0 024 0 028 in 0 60 0 70 mm Correct the gap if necessary by carefully bending the side electrode SIDE ELECTRODE 5 Install the spark plug carefully by hand to avoid cross threading 6 After the spark plug seats tighten with a 5 8 co cdm io inch spark plug wrench to compress the washer If reinstalling the used spark plug tighten 1 8 1 4 turn after the spark plug seats If installing a new spark plug tighten 1 2 turn after the spark plug seats A loose spark plug can overheat and damage the engine Overtightening the spark plug can damage the threads in the cylinder head 7 Attach the spark plug cap 28 SERVICING YOUR HONDA TRIMMER RECOIL STARTER Spark Arrester Service The spark arrester must be serviced every 100 hours to keep it functioning as designed If the engine has been running the muffler will be very hot Allow the muffler to cool before servicing the spark arrester 1 Remove the four 5 x 18 mm bolts from the recoil starter and remove the recoil starter 2 Disconnect the spark
32. e dangerous projectiles A dull blade is more likely to snag and thrust kickback Inspect the blade regularly and do not operate the trimmer with a dull worn or damaged blade cu om CRACKED A dull blade can be sharpened but a blade that is worn out bent cracked chipped or otherwise damaged must be replaced When a blade needs sharpening or replacement take the trimmer to a Honda trimmer servicing dealer Or if you have a torque wrench you can remove and install a blade yourself Blade Removal amp Installation UMK431UNBA only For models other than the UMK431UNBA a special Barrier Kit must be installed before a blade can be used Refer to the instructions provided with that kit for blades installed on other loop handle models Always wear gloves when working around the blade Always install the blade cover on the blade A torque wrench is required to install a blade if you do not have one have a Honda trimmer servicing dealer tighten the blade nut for you If the blade nut is tightened too much the blade bolt can break If is not tightened enough the blade could come off In either case it would be possible for the blade to fly off while you are operating the trimmer BLADE SHARPENING To avoid weakening the blade or causing imbalance or poor cutting the blade should be sharpened by trained staff at a Honda trimmer servicing dealer BLADE REPLACEMENT Your Honda trimmer servicing de
33. e spool all the way into the drum If you re not sure the line snapped out of the notch carefully pull the spool away from the drum and inspect the line Slide the drum spool assembly back on to the the drive bolt then install the spring Hand tighten the three sided knob as tight as you can METAL EYELET 35 SERVICING YOUR HONDA TRIMMER Semiautomatic Bump Feed Cutting Line Head 1 Clean any mud dirt debris etc from the area around the trimmer head otherwise it will make it more difficult to service 2 Locate the square shaped PUSH AND TWIST button on the side of the trimmer PUSH AND TWIST head 3 Hold the drum section of the trimmer head Emo ni firmly then press the PUSH AND TWIST button in slightly then turn the spool cover slightly to line up the triangle index marks The spool cover and the semiautomatic button will come loose from the drum 4 Remove the spool and spring from the drum DEL anes Remove any remaining nylon line from the spool SPOOL 5 Measure about 12 feet 3 7 meters of new line then thread one end through the eyelet on the spool Pull the line until the two lengths are equal 6 Hold the spool in your hand with the spring side facing away Wind both lines together around the spool turning the spool in the direction shown by the arrow 7 When winding it is important not to allow the NYLON LINE two lines to cross over each other Positi
34. e trimmer on the transport vehicle A hot engine and exhaust system can burn you and can ignite some materials Always turn the ignition switch to the OFF position Make sure the fuel cap is securely tightened LOADING The trimmer may be secured by suitable clamps hangers or straps Secure the trimmer by at least two points along the drive shaft tube Avoid securing the trimmer by the engine cutting head gearbox or handle area The trimmer should be secured in a horizontal position with the engine upright as shown Don t hang the trimmer by the gearbox or cutting head or they may be damaged 43 TAKING CARE OF UNEXPECTED PROBLEMS STARTING PROBLEMS Engine Will Not Start Possible Cause Correction Check control positions Ignition switch OFF Turn ignition switch ON Choke not in CLOSED cold Move choke to the CLOSED engine position Out of fuel Add fuel Fuel not reaching carburetor Press priming bulb repeatedly Bad fuel trimmer stored without Drain fuel tank and carburetor treating or draining gasoline refuel with fresh gasoline refueled with bad gasoline Remove spark plug Spark plug faulty fouled or has Clean gap or replace the spark incorrect gap plug Take trimmer to an Fuel filter clogged carburetor Replace or repair faulty authorized Honda malfunction ignition malfunction components as needed servicing dealer or refer valves stuck etc to shop manual Check fuel
35. e used for edging ee against solid surfaces Weed Brush Blades WEED BRUSH BLADE These metal blades have chisel shaped teeth that are used for cutting tough field grass thick weeds and light brush They are not designed for sawing woody material The teeth must be sharp for good results Brush Wood Blades BRUSH WOOD BLADE These metal saw tooth blades are used for sawing through saplings shrubs and woody brush The teeth must be sharp for good results Brush wood blades will also cut grass and weeds but they are not efficient for that purpose 8 RECOMMENDED CUTTING ATTACHMENTS Brush Wood Blade Cover Installation and BLAD Removal DEBRIS SHIELD 1 Place the blade cover on the blade halfway starting with end A To prevent the posts on end from interfering with the debris shield remove end A from the blade and place it beside the blade as shown BLADE COVER 2 Turn the blade slowly until end A is clear of the debris shield 3 Replace end A on the blade 4 With the blade cover fully seated on the blade fasten the tab at end B on the post at end A Remove the blade cover in the reverse order of installation CUTTING ATTACHMENT APPLICATIONS GRASS AND LIGHT WEEDS f OS MIS Mw c fs Se 7 s v F Mu TEN IT f d AND e Te P e ies Sg vM 3 P PME s pM 2 z oe LUV 4 Bie fh D
36. ease more line pull spool and turn 4 counterclockwise SEMIAUTOMATIC bump feed CUTTING LINE HEAD OPERATION Using Blades Refer to the chart on page 9 for appropriate blade applications If using a blade on a Honda trimmer equipped with a loop handle also install the Honda conversion kit that includes a full shoulder harness a barrier bar and a debris shield for blades Follow the installation instructions and safety information that come with the kit Metal blades supplied with UNBA models are supplied with a cover surrounding the edge of the blade For your safety and to protect the blade the cover should be installed whenever the trimmer is not in use Be sure to remove the blade cover before starting the engine Otherwise the blade cover may fly off at high speed If the trimmer starts to vibrate after the blade strikes an object stop the engine immediately and check the blade for damage A damaged blade may break and pieces of a broken blade can become dangerous projectiles Replace the blade if it is broken cracked bent or damaged in any way SAFE OPERATING PRACTICES Be very careful when operating the trimmer over uneven or rough ground and when the ground is wet and slippery Watch out for hidden obstacles that could cause you to stumble Operate the trimmer only under conditions with good visibility Do not operate the trimmer where you cannot see what it is cutting AWARNING Rotating
37. essible surfaces Start the engine outdoors and let it run until it reaches normal operating temperature to evaporate any water remaining on the engine Stop the engine and allow it to cool After the trimmer is clean and dry touch up any damaged paint and coat other areas that may rust with a light film of oil Lubricate the control cable cores with a silicone spray lubricant Fuel Gasoline will oxidize and deteriorate in storage Old gasoline will cause hard starting and it leaves gum deposits that clog the fuel system If the gasoline in your trimmer deteriorates during storage you may need to have the carburetor and other fuel system components serviced or replaced The length of time that gasoline can be left in your fuel tank and carburetor without causing functional problems will vary with such factors as gasoline blend your storage temperatures and whether the fuel tank is partially or completely filled The air in a partially filled fuel tank promotes fuel deterioration Very warm storage temperatures accelerate fuel deterioration Fuel deterioration problems may occur within a few months or even less if the gasoline was not fresh when you filled the fuel tank The Distributors Limited Warranty does not cover fuel system damage or engine performance problems resulting from neglected storage preparation You can extend fuel storage life by adding a gasoline stabilizer that is formulated for that purpose or y
38. g an area to shorten stumps Short lengths of shrub and sapling stumps may tear off and be thrown at high speed Sawing heavy brush and saplings with the left side of the blade will reduce the risk of kickback Accelerate the engine to maximum speed before starting the cut and saw through with uniform pressure If shrubs or saplings bind the blade stop the engine and while supporting the weight of the trimmer push the shrub or sapling away to free the blade Do not use the blade as a lever SAWING Operation on Slopes Start on the low side of a slope and work upward This will reduce your risk of slipping and falling and it will give you a cutting angle that will better enable you to direct debris away from you Do not let the cutting line or blade dig into the slope because that can cause stones and dirt to be thrown at you Do not raise the cutting attachment above waist level during operation because that would increase the risk of thrown objects striking your face Avoid steep slopes that would require holding the cutting attachment above waist level Avoid slippery slopes that might cause you to lose your balance 23 SERVICING YOUR HONDA TRIMMER THE IMPORTANCE OF MAINTENANCE Good maintenance is essential for safe economical and trouble free operation It will also help reduce air pollution AWARNING Improperly maintaining this trimmer or failure to correct a problem before operation can cause a ma
39. hrust kickback is the sudden forceful and uncontrolled movement of a blade equipped trimmer that may occur if the blade binds in the cut or strikes a solid object BLADE THRUST Blade thrust kickback throws the trimmer in the direction opposite blade rotation at the point of contact and the jolt received by the operator can aN result in further loss of control dE To reduce the risk of loss of control use blades SA on trimmers equipped with a U type handlebar or f lA AN AD AN install the barrier bar optional trimmers equipped with a loop handle Replace or resharpen dull blades Dull blades are more likely to bind in the cut and cause blade thrust Watch out for hidden obstacles such as rocks stumps roots etc that could cause the blade to kick back if struck Blade thrust is more likely to occur in areas where it is difficult to see what is being cut Understand the reaction forces of the blade When using a brush blade to saw through heavy brush and small saplings saw with the side of the brush blade that is moving toward you and tends to pull the trimmer away from you Blades on Honda UMK422 and UMK431 trimmers rotate counterclockwise as viewed from the operator s position Therefore the left side of the blade is moving toward you With these trimmers sawing with the left side of a brush blade will give you better control and less risk of kickback though it will throw the sawdus
40. i t A iro i a 7 1 4 TEE Ne sot Bie nu etae us sab mo ut Tie ED ndi mu INS 2 4 e l c je t LESE wir o LN Your Honda trimmer servicing dealer has cutting attachments have been designed and approved for your trimmer and are covered by warranty Non Honda attachments are usually designed for universal applications Although aftermarket attachments may fit on your trimmer they may not meet factory specifications and could make your trimmer unsafe CONTROLS amp EQUIPMENT COMPONENT amp CONTROL LOCATIONS CHOKE LEVER SPARK PLUG CAP AIR CLEANER COVER N SPARK ARRESTER UMK422LNA UMK422LTA UMK431LNA UMK431LTA FUEL RETURN TUBE clear px FUEL SUPPLY TUBE Sa ex black STARTER GRIP CUTTING LINE HEAD GEAR CASE LOOP HANDLE OIL FILLER CAP HARNESS HANGER THROTTLE SET BUTTON OPERATOR PRESENCE LEVER DEBRIS SHIELD WITH CUTOFF KNIFE DRIVE SHAFT HOUSING IGNITION SWITCH THROTTLE TRIGGER UMK431UNBA GEAR CASE supplied with two SLADE IGNITION SWITCH cutting attachments and debris shields THROTTLE THR Unis BUTTON 7 A PRESENCE DEBRIS SHIELD WN 7 LEVER FOR BRUSH WOOD BLADE NOS 22 4 Ni A HARNESS HANGER DRIVE SHAFT NN CUTTING LINE HEAD HOUSING U TYPE HANDLEBAR DEBRIS SHIELD
41. intenance Only you can decide whether or not you should perform a given task AWARNING Failure to properly follow maintenance instructions and precautions can cause you to be seriously hurt or killed Always follow the procedures and precautions in the owner s manual Safety Precautions e Make sure the engine is off before you begin any maintenance or repairs This will eliminate several potential hazards Carbon monoxide poisoning from engine exhaust Be sure there is adequate ventilation whenever you operate the engine Burns from hot parts Let the engine and exhaust system cool before touching Injury from moving parts Do not run the engine unless instructed to do so e Read the instructions before you begin and make sure you have the tools and skills required e reduce the possibility of fire or explosion be careful when working around gasoline Use only a nonflammable solvent not gasoline to clean parts Keep cigarettes sparks and flames away from all fuel related parts SERVICING YOUR HONDA TRIMMER MAINTENANCE SCHEDULE REGULAR SERVICE PERIOD 3 Refer to page number ITEM Perform at every indicated month or operating hour interval whichever comes first Idle speed Check Valve clearance Check 19 Combustion chamber Clean Gear case Lubricate Clutch shoes and drum Check Spark plug Check Geo o
42. ion Maintenance Inspection e Check the oil level see page 26 Running the engine with a low oil level can cause engine damage Check the air filter see page 27 A dirty air filter will restrict air flow to the carburetor reducing engine and trimmer performance Check throttle cable free play see page 30 The cable must be correctly adjusted and operate smoothly for good throttle control Check the fuel level see 31 Starting with a full tank will help to eliminate or reduce operating interruptions for refueling 15 BEFORE OPERATION ARE YOUR SHOULDER HARNESS AND TRIMMER CORRECTLY ADJUSTED Adjusting the Harness Adjust the harness so the quick release latch is at your right hip as shown QUICK RELEASE LATCH QUICK RELEASE LATCH SINGLE STRAP SHOULDER HARNESS 16 Balancing the Trimmer on the Shoulder Harness Hang the trimmer on the harness hook and see how it balances Adjust the shoulder harness the hanger clamp on the trimmer shaft and the loop handle or U type handlebar so the handle or handlebars are in a comfortable operating position and the trimmer hangs with its cutting attachment a few inches above the ground see A few inches above the ground GROUND 1 OPERATION SAFE OPERATING PRECAUTIONS Before operating the trimmer for the first time please review the IMPORTANT SAFETY INFORMATION on eye the chapter titled BEFORE OPERATION Even if you have
43. is felt then return the starter grip gently This closes the valves so moisture cannot enter 42 STORAGE PRECAUTIONS If your trimmer will be stored with gasoline in the fuel tank and carburetor it is important to reduce the hazard of gasoline vapor ignition Select a well ventilated storage area away from any appliance that operates with a flame such as a furnace water heater or clothes dryer Also avoid any area with a spark producing electric motor or where power tools are operated If possible avoid storage areas with high humidity because that promotes rust and corrosion With the engine and exhaust system cool cover the trimmer to keep out dust A hot engine and exhaust system can ignite or melt some materials Do not use sheet plastic as a dust cover A non porous cover will trap moisture promoting rust and corrosion REMOVAL FROM STORAGE Check your trimmer as described in the BEFORE OPERATION chapter of this manual If the fuel was drained during storage preparation fill the tank with fresh gasoline If you keep a container of gasoline for refueling be sure that it contains only fresh gasoline Gasoline oxidizes and deteriorates over time causing hard starting If the cylinder was coated with oil during storage preparation the engine will smoke briefly at startup This is normal TRANSPORTING BEFORE LOADING If the engine has been running allow it to cool for at least 15 minutes before loading th
44. lfunction in which you can be seriously hurt or killed Always follow the inspection and maintenance recommendations and schedules in this owner s manual To help you properly care for your trimmer the following pages include a maintenance schedule routine inspection procedures and simple maintenance procedures using basic hand tools Other service tasks that are more difficult or require special tools are best handled by professionals and are normally performed by a Honda technician or other qualified mechanic The maintenance schedule applies to normal operating conditions If you operate your trimmer under severe conditions such as sustained high load or high temperature operation or use it in unusually wet or dusty conditions consult your servicing dealer for recommendations applicable to your individual needs and use Remember that your servicing dealer knows your trimmer best and is fully equipped to maintain and repair it To ensure the best quality and reliability use only new genuine Honda parts or their equivalents for repair and replacement Maintenance replacement or repair of the emission control devices and systems may be performed by any engine repair establishment or individual using parts that are certified to EPA standards 24 MAINTENANCE SAFETY Some of the most important safety precautions follow However we cannot warn you of every conceivable hazard that can arise in performing ma
45. ne head or blade should not rotate with the engine idling If there is rotation at idle adjust the idle speed correctly before using the trimmer For idle adjustment consult your servicing dealer 18 OPERATION STOPPING THE ENGINE 1 Release the throttle lever 2 Move the ignition switch button to the OFF O position Wait for the cutting line head or blade to stop before allowing the end of the trimmer to contact anything A WARNING The blade will continue to spin briefly after the engine has stopped or the throttle trigger is released coasting blade can cause injury Maintain proper control of the trimmer until the blade has completely stopped rotating TRIMMER HARNESS QUICK DISCONNECTION To quickly detach the trimmer from the harness pull the quick release latch tab upward Insert the latch tongue in the slot of the quick release latch to reattach the trimmer to the harness TRIMMER OPERATION Operating Position Hold the trimmer firmly with both hands with your fingers and thumbs encircling the handles as shown This will help you to keep the trimmer under control at all times e Keep firm footing and balance e Do not overreach e Keep the cutting attachment below waist level e Keep all parts of your body away from the rotating cutting attachment and hot surfaces IGNITION THROTTLE TRIGGER OPERATION Throttle Operation Pull the throttle trigger toward the g
46. ne to protect your eyes Wearing a dust mask will help to reduce the amount of pollens and dust inhaled 14 Hearing Protection Hearing protectors will help to protect your ears from noise Earmuff style hearing protectors can also protect your ears from thrown objects Hand and Body Protection Wear gloves a long sleeved shirt and long pants made of heavy material Clothing should fit closely but allow freedom of movement and should have no strings straps etc that could catch on brush or the trimmer Keep clothing fastened Foot Protection Wear sturdy work boots with good toe protection and nonslip soles IS YOUR WORKING AREA READY Objects thrown by the trimmer can cause serious injury Before operating the trimmer carefully inspect the area and remove all objects that could be thrown by or entangled in the cutting attachment such as rocks broken glass nails wire or string Clear the area of children bystanders and pets Keep all children bystanders and pets at least 50 feet 15 meters away from where the trimmer is being operated Even outside a 50 foot 15 meter radius of the trimmer there may be a risk of injury from thrown objects so bystanders should be encouraged to wear eye protection If anyone approaches you while you are operating the trimmer release the throttle trigger and stop the engine BEFORE OPERATION IS YOUR TRIMMER READY TO GO For your safety and to maximize
47. o remove and install either style trimmer head from your trimmer 1 Insert the tip of the 4 mm hexagon wrench supplied with your trimmer fully into the hole on the gear case Turn the trimmer head until you feel the tool drop into the hole in the internal locking ring Verify the trimmer head does not turn All drive bolts use left hand threads Make sure the tool remains in the hole then grasp the trimmer head and turn it clockwise as viewed from the bottom of the trimmer head to remove Remove the remaining parts Spacer cover plate and lock ring from the drive bolt Note the order and orientation of each part as you remove them Installation is the reverse of removal Always clean debris dirt loose string etc from the trimmer head and drive bolt before installation Tighten the trimmer head securely 38 TRIMMER HEAD 4mm HEXAGON WRENCH GEAR CASE SPACER DRIVE BOLT COVER PLATE 25 LOCK RING TRIMMER HEAD SERVICING YOUR HONDA TRIMMER Blades Blade Inspection Always wear gloves when working around the blade Before each use check the blade for wear and damage and check the tightness of the blade nut Examine the entire head area including the debris shield and clear or clean it free from dirt debris loose string wire or any other foreign materials worn damaged cracked blade can break and pieces of the damaged blade can becom
48. oise damage e Wearing protective clothing also reduces the risk and severity of injury from thrown debris or contact with the cutting attachment Wear the trimmer harness gloves a long sleeved shirt long pants and sturdy boots with nonslip soles 14 for more information Keep Away From Cutting Lines and Blades e A spinning cutting attachment can cut through your clothes and skin just as easily as it cuts through grass and brush Keep all parts of your body away from a spinning cutting attachment e Even after the engine has stopped the cutting attachment will spin for several seconds Do not touch it until it has stopped spinning or you may get cut Turn the Engine Off When Not Trimming e f you stop trimming or cutting for any reason even to clean off the cutting attachment always shut off the engine Keep People Away From Your Working Area e prevent injury to others keep people at least 50 feet 15 meters away from the working area during operation Always Wear the Harness When Trimming e The harness keeps the trimmer away from your body lowering your chances of being cut by the trimmer s blade or cutting line Read This Manual Before Using the Trimmer e Read the manual before operating the trimmer Understand how to use all the controls and obey all warnings Clear the Working Area First e Objects thrown by the trimmer can cause serious injury Before operating the trimmer
49. on a finger between the lines as you turn the spool Rotate spool this direction to wind line to prevent the lines from becoming crossed 36 SERVICING YOUR HONDA TRIMMER 10 11 When you have about 6 inches 150 of line remaining press the lines into the two notches on the bottom of the spool This will hold the line on the spool for reassembly Guide the ends of the lines through the metal eyelets on the drum Push the spool into the drum be careful not to let any loose line get trapped outside the edges of the spool Hold the spool inside the drum then place the semiautomatic button and spool cover on top of the spool Hold the spool cover semiautomatic button and drum together firmly then pull each line until you hear it snap out of the notch It is okay if one line is longer than the other If you re not sure if either line snapped out of the notch carefully lift the spool cover away from the upper section and inspect the line Locate the index triangle mark on the drum and line it up with the other triangle mark on the PUSH AND TWIST button on the spool cover Press the cover against the drum then slightly turn the cover counter clockwise until it clicks in place It is not necessary to press the PUSH AND TWIST button during reassembly NYLON SPOOL LINE SPRING METAL EYELET 37 SERVICING YOUR HONDA TRIMMER Removal amp Installation This section shows you how t
50. ors e Wipe up spills immediately Never refuel the engine inside a building where gasoline fumes may reach flames or sparks Keep gasoline away from appliance pilot lights barbecues electric appliances power tools etc Spilled fuel is not only a fire hazard it causes environmental damage Wipe up spills immediately Move at least 10 feet 3 meters away from the fueling source and site before starting the engine FUEL TANK CAP Fuel Recommendations Use unleaded gasoline with a pump octane rating of 86 or higher These engines are certified to operate on unleaded gasoline Unleaded gasoline produces fewer engine and spark plug deposits and extends exhaust system life Never use stale or contaminated gasoline or an oil gasoline mixture Avoid getting dirt or water in the fuel tank Occasionally you may hear light spark knock or pinging metallic rapping noise while operating under heavy loads This is no cause for concern If spark knock or pinging occurs at a steady engine speed under normal load change brands of gasoline If spark knock or pinging persists see an authorized Honda servicing dealer Running the engine with persistent spark knock or pinging can cause engine damage Running the engine with persistent spark knock or pinging is misuse and the Distributor s Limited Warranty does not cover parts damaged by misuse 31 SERVICING YOUR HONDA TRIMMER Fuel Filter and Fuel Tank
51. ou can avoid fuel deterioration problems by draining the fuel tank and carburetor 41 STORAGE Adding Fuel Stabilizer to Extend Fuel Storage Life When adding a fuel stabilizer fill the fuel tank with fresh gasoline If only partially filled air in the tank will promote fuel deterioration during storage If you keep a container of gasoline for refueling be sure that it contains only fresh gasoline Add fuel stabilizer following the manufacturer s instructions After adding a fuel stabilizer run the engine outdoors for 10 minutes to be sure that treated gasoline has replaced the untreated gasoline in the carburetor Draining the Fuel Tank and Carburetor Disconnect the spark plug cap Make sure the engine switch is in the STOP position Drain the fuel from the fuel tank to a suitable container Press the priming bulb a few times to draw any remaining fuel out of the carburetor then drain this fuel from the tank Engine Oil Change the engine oil see page 26 Carburetor amp Air Cleaner Clean the air filter see page 27 and move the choke lever to the CLOSED position Blade If a blade is installed put the blade cover on the blade Engine Cylinder Remove the spark plug see page 28 Pour a 1 4 tablespoon 1 3 cc of clean engine oil into the cylinder Pull the starter rope several times to distribute the oil in the cylinder Reinstall the spark plug Pull the starter rope slowly until resistance
52. p you avoid damage to your trimmer other property or the environment We suggest you read the warranty policy to fully understand its coverage and your responsibilities of ownership The warranty policy is a separate document that should have been given to you by your dealer When your trimmer brush cutter needs scheduled maintenance keep in mind that your Honda servicing dealer is specially trained in servicing Honda trimmers brush cutters Your Honda servicing dealer is dedicated to your satisfaction and will be pleased to answer your questions and concerns Best Wishes Honda Motor Co Ltd INTRODUCTION A FEW WORDS ABOUT SAFETY Your safety and the safety of others are very important And using this trimmer brush cutter safely is an important responsibility To help you make informed decisions about safety we have provided operating procedures and other information on labels and in this manual This information alerts you to potential hazards that could hurt you or others Of course it is not practical or possible to warn you about all the hazards associated with operating or maintaining a trimmer brush cutter You must use your own good judgment You will find important safety information in a variety of forms including e Safety Labels on the trimmer brush cutter e Safety Messages preceded by a safety alert symbol Z and one of three signal words DANGER WARNING or CAUTION These signal words mean DAN
53. ption that your machine will be used for its designed purpose Sustained high load or high temperature operation or use in unusually wet or dusty conditions will require more frequent service TECHNICAL amp CONSUMER INFORMATION Air Index An Air Index Information hang tag label was applied to this engine in accordance with the requirements of the California Air Resources Board The bar graph is intended to provide you our customer the ability to compare the emissions performance of available engines The lower the Air Index the less pollution The durability description is intended to provide you with information relating to the engine s emission durability period The descriptive term indicates the useful life period for the engine s emission control system See your Emission Control Warranty for additional information Applicable to Emissions Durability Period Moderate hours 0 65 cc 125 hours greater than 65 cc Intermediate 125 hours 0 65 cc 250 hours greater than 65 cc Extended 300 hours 0 65 cc 500 hours greater than 65 cc The Air index Information hang tag must remain on the trimmer brush cutter until it is sold Remove the hang tag before operating the trimmer brush cutter 49 TECHNICAL amp CONSUMER INFORMATION Specifications FEATURES UMK422LNA UMK422LTA UMK431LNA UMK431LTA UMK431UNBA Gime GX3315hp Loophande e e e e U type hande
54. re Removal or alteration of any part of the intake fuel or exhaust systems Altering or defeating the speed adjusting mechanism to cause the engine to operate outside its design parameters 48 Problems that may Affect Emissions If you are aware of any of the following symptoms have your engine inspected and repaired by your servicing dealer Hard starting or stalling after starting Rough idle Misfiring or backfiring under load Afterburning backfiring Black exhaust smoke or high fuel consumption Heplacement Parts The emissions control systems on your new Honda engine were designed built and certified to conform with EPA and California emissions regulations We recommend the use of genuine Honda parts whenever you have maintenance done These original design replacement parts are manufactured to the same standards as the original parts so you can be confident of their performance The use of replacement parts that are not of the original design and quality may impair the effectiveness of your emissions control system A manufacturer of an aftermarket part assumes the responsibility that the part will not adversely affect emissions performance The manufacturer or rebuilder of the part must certify that use of the part will not result in a failure of the engine to comply with emissions regulations Maintenance Follow the maintenance schedule page 25 Remember this schedule is based on the assum
55. rip to increase engine speed and start cutting attachment rotation The trimmer has the greatest cutting force at maximum engine speed Release the throttle trigger to reduce engine speed At idle the cutting attachment should coast to a stop Using a Nylon Cutting Line Head As the ends of the line wear away more line must be released from the cutting line head Your trimmer is factory equipped with either a manual feed or semiautomatic bump feed cutting line head which have different procedures for releasing line The debris shield is equipped with a cutoff knife which automatically removes any excess line that is released Manual Feed Cutting Line Head Line must be released with the cutting line head stopped 1 Stop the engine and wait for the cutting line head to coast to a complete stop 2 Hold the drum pull the spool out about a quarter of an inch then turn the spool counterclockwise until it snaps into the drum again The spool will snap into the drum every sixth of a turn which releases 1 to 1 1 2 inches of line Semiautomatic bump feed Cutting Line Head Line must be released with the cutting line head spinning rapidly With the engine running at full speed tap the cutting line head on hard bare ground Each tap releases about 2 inches of line 20 THROTTLE TRIGGER IDLE cutting attachment FAST stops cutting attachment rotates MANUAL FEED CUTTING LINE HEAD To rel
56. rs brush cutters are supplied with a shoulder harness and safety glasses Refer to page 14 a description of other equipment and protective clothing you will need Shoulder Harness A full shoulder harness must be worn by the operator of these Honda trimmers brush cutters when equipped with a blade and debris shield If the trimmer is equipped with a cutting line head and shield with cutoff knife the operator may wear a single strap harness suitable shoulder harness is supplied with each new Honda UMK422 and UMK431 trimmer brush cutter Replacement shoulder harnesses may be purchased through any authorized Honda trimmer brush cutter servicing dealer Before operation adjust your shoulder harness as described on Quick Release Latch The shoulder harnesses supplied with these trimmers are equipped with a quick release latch Pull the latch tab upward to detach the trimmer from the harness Insert the latch tongue in the slot of the quick release latch to reattach the trimmer to the harness Safety Glasses Safety glasses or goggles that comply with ANSI standard Z87 1 must be worn by the operator of any Honda trimmer brush cutter The safety glasses supplied with each new Honda UMK422 and 431 trimmer brush comply with the ANSI standard FULL SHOULDER HARNESS QUICK RELEASE LATCH SINGLE STRAP SHOULDER HARNESS QUICK RELEASE LATCH LATCH TAB ON t SS PZ QUICK RELE
57. sed from the cutting head by bumping the spool on hard ground during operation CUTTING LINE HEAD NYLON MONOFILAMENT LINE CUTOFF KNIFE Inside debris shield DEBRIS SHIELD MANUAL FEED CUTTING LINE HEAD To release more line pull spool and turn counterclockwise SEMIAUTOMATIC bump feed CUTTING LINE HEAD RECOMMENDED CUTTING ATTACHMENTS BLADES AND SHIELD BLADE DEBRIS SHIELD CUTTING LINE DEBRIS SHIELD A variety of blades are available from your Honda trimmer servicing dealer Always use a debris S ices E shield designed for use with a blade when WEED BRUSH BLADE attaching a blade to your trimmer This type of debris shield does not have a cutoff knife DEBRIS SHIELD FOR BRUSH WOOD BLADE Honda UMK431UNBA trimmers are supplied with a blade cover surrounding the edge of the blade For safety and to protect the blade the cover should be installed whenever the trimmer is not in DEBRIS use SHIELD If installing a metal blade on a Honda trimmer equipped with a loop handle also install the optional barrier kit that includes a full shoulder harness a barrier bar and a debris shield for metal blades Follow the installation instructions and safety information that come with the kit Grass Weed Blades GRASS WEED BLADE Grass weed blades which may be plastic or metal are used as an alternative to nylon monofilament line for cutting grass and ordinary weeds However blades should never b
58. t button To set the throttle trigger for starting press the operator presence lever by gripping the control handle pull the throttle trigger then press and hold the throttle set button while releasing the ON 1 throttle trigger THROTTLE 4 Move the ignition switch button to the ON 1 SET BUTTON pose L OPERATOR PRESENCE LEVER 17 OPERATION 5 Set the trimmer on the ground resting on the debris shield and the fuel tank guard Do not allow the cutting line or blade to contact any obstruction Always rest the trimmer on the ground for starting rather than holding it in the operating position That prevents the end of the trimmer from swinging into something as you start the engine 6 With your left hand hold the drive shaft housing just ahead of the engine With your right hand pull the starter grip lightly until you feel resistance then pull briskly Return the starter grip gently 7 If the choke lever was moved to the CLOSED position to start the engine gradually move it to the OPEN position as the engine warms up Allow the engine to warm up for a few minutes after a cold start When the engine is warm enough to idle well pull and release the throttle trigger to disengage the throttle set button 8 With the engine idling hook the trimmer to your shoulder harness Be careful to avoid contact with the cutting line head or blade while handling the trimmer with the engine running The cutting li
59. t toward you Cut from the side of saplings that will cause them to fall away from the trimmer This will help to prevent the blade from binding in the cut and kicking back Accelerate the engine to maximum speed before starting the cut and saw through with uniform pressure OPERATING TIPS Scything Swing the trimmer in a level arc by rotating your body with a smooth easy motion rather than moving the trimmer with your arms Do not chop at tough weeds and brush let the cutting line or blade work through tough growths gradually SCYTHING t d MILL et HOM Eom Pd LA 1 4 voi 7 Jh if uU et To direct thrown debris away from you tilt the cutting attachment to the right side scythe from left to right then return without cutting 22 OPERATION Trimming and Edging Use nylon line for cutting against a hard surface Work from an angle where debris that strikes the hard surface will ricochet away from you Avoid contact with wires wire fences metal rods etc Overlapping a wire will cause the nylon line to wrap around the wire and break off Brush Clearing Clearing brush with a brush blade may require both scything and sawing TRIMMING Scything with the right side of the blade will direct thrown debris away from you Be especially careful to direct debris away from you if recuttin
60. ters with a modified carburetor may cause the engine to overheat and result in serious engine damage For use at low altitudes have your servicing dealer return the carburetor to original factory specifications TECHNICAL amp CONSUMER INFORMATION Oxygenated Fuels Some conventional gasolines are being blended with alcohol or an ether compound These gasolines are collectively referred to as oxygenated fuels To meet clean air standards some areas of the USA and Canada use oxygenated fuels to help reduce emissions If you use an oxygenated fuel be sure it is unleaded and meets the minimum octane rating requirement Before using an oxygenated fuel try to confirm the fuel s contents Some states provinces require this information to be posted on the pump The following are the EPA approved percentages of oxygenates ETHANOL ethyl or grain alcohol 1096 by volume You may use gasoline containing up to 1096 ethanol by volume Gasoline containing ethanol may be marketed under the name Gasohol MTBE Methyl Tertiary Butyl Ether 1596 by volume You may use gasoline containing up to 1596 MTBE by volume METHANOL methyl or wood alcohol 596 by volume You may use gasoline containing up to 596 methanol by volume as long as it also contains cosolvents and corrosion inhibitors to protect the fuel system Gasoline containing more than 596 methanol by volume may cause starting and or performance problems It may
61. tion 46 Oxygenated Fuels 47 Emission Control System Information 48 PAU NOON T 49 sre jje jie T P 50 CONSUMER INFORMATION 52 Honda Publications sissonssaverscdnndenaasssruasancsancnonsveasautroniacdundeewse 52 Warranty Service Information eese 52 QUICK REFERENCE INFORMATION TRIMMER SAFETY IMPORTANT SAFETY INFORMATION Honda UMK422 and 431 trimmers brush cutters are designed to cut grass weeds brush and or wood if equipped with an appropriate cutting attachment Other uses can result in injury to the operator or damage to the trimmer and other property These Honda trimmers are intended for use by gardening professionals Never allow children to operate the trimmer Most accidents can be prevented if you follow all instructions in this manual and on the trimmer The most common hazards are discussed below along with the best way to protect yourself and others Always Wear Eye Protection and Protective Clothing e The most frequent injuries associated with string trimmers are eye injuries caused by thrown debris Always wear safety glasses or goggles that meet the ANSI Z87 1 rating whenever you use the trimmer e The operator must wear hearing protectors when using this trimmer Hearing protectors will protect the operator s ears from n

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