Homelite UT10570 User's Manual
Contents
1. FLAT FILE Fig 65 Page 28 od RESTORE ORIGINAL SHAPE BY ROUNDING THE FRONT SENS MAINTAINING THE GUIDE BAR See Figure 67 A CAUTION Make sure the chain has stopped before you do any work on the saw Every week of use reverse the guide bar on the saw to distribute the wear for maximum bar life The bar should be cleaned every day of use and checked for wear and damage Feathering or burring of the bar rails is a normal process of bar wear Such faults should be smoothed with a file as Soon as they occur A bar with any of the following faults should be replaced E Wear inside the bar rails that permits the chain to lay over sideways B Bent guide bar Cracked or broken rails B Spread rails In addition lubricate guide bars with a sprocket at their tip weekly Using a grease syringe lubricate weekly in the lubricating hole Turn the guide bar and check that the lubrication holes and chain groove are free from impurities LUBRICATING HOLE MAINTAINING THE SAFE T TIP NOSE GUARD See Figures 68 and 69 A CAUTION Make sure the chain has stopped before you do any work on the saw A WARNING Although the guide bar comes with a SAFE T TIP anti kickback device already installed you need to check the tightness of the mounting screw before each use Tighten the mounting screw of the nose guard as in2. The saw can become pinched or hung in the log if you make the first cut deeper than 1 3 of the diameter of the log Give special attention to logs under stress to prevent the bar and chain from pinching OVERBUCKING See Figure 38 Begin on the top side of the log with the bottom of the saw against the log exert light pressure downward Note that the saw will tend to pull away from you UNDERBUCKING See Figure 38 Begin on the under side of the log with the top of the saw LOG SUPPORTED AT ONE END FINISHING CUT LOAD 1ST CUT 1 3 DIA LOG SUPPORTED AT BOTH ENDS against the log exert light pressure upward During 1ST CUT 1 3 DIA underbucking the saw will tend to push back at you Be prepared for this reaction and hold the saw firmly to LOAD maintain control ye FINISHING CUT OVERBUCKING Page 20 OPERATION LIMBING AND PRUNING See Figure 39 SECOND CUT E Work slowly keeping both hands on the saw with a firm grip Maintain secure footing and balance E Keep the tree between you and the chain while limbing Do not cut from a ladder this is extremely dangerous Leave this operation for professionals E Do not cut above chest height as a saw held higher is FIRST CUT difficult to control against kickback 1 3 DIAMETER A WARNING FINISHING CUT jj Never climb into a tree to limb or prune Do not stand on ladders platforms a log or in any position which can cause you to lose your ba
3. 16 in diameter round file and holder Do all of your filing at the midpoint of the bar Keep the file level with the top plate of the tooth Do not let the file dip or rock See Figure 60 Using light but firm pressure Stroke towards the front corner of the tooth Lift the file away from the steel on each return stroke Put a few firm strokes on every tooth File all left hand cutters in one direction Then move to the other side and file the right hand cutters in the opposite direction Remove filings from the file with a wire brush CUTTING CORNER TOP PLATE 4 SIDE PLATE RIVET HOLE a 2S f HEEL v DEPTH GAUGE RAKER DEPTH GAUGE CLEARANCE Fig 58 MAINTENANCE LEFT HAND CUTTERS RIGHT HAND CUTTERS A CAUTION A dull or improperly sharpened chain can cause excessive engine speed during cutting which may result in severe engine damage A WARNING Improper chain sharpening increases the potential of kickback A WARNING Failure to replace or repair a damaged chain can cause serious injury A WARNING The saw chain is very sharp Always wear protective gloves when performing maintenance to the chain Page 27 MAINTENANCE TOP PLATE FILING ANGLE See Figure 62 SIDE PLATE FILING ANGLE B CORRECT 30 file holders are marked with guide 80 marks to align file properly to produce correct top plate angle B LESS THAN 30 for cross cutting MORE T
4. Bar Part Number Chain Part Number 16 in PS06132 PS06136 18 in PS06131 PS06135 UT10570 Length of Bar Guide Bar Part Number Chain Part Number 20 in PS06301 PS06134 TROUBLESHOOTING PROBLEM POSSIBLE CAUSE SOLUTION Engine will not start 1 No spark 1 Check spark Remove air filter cover Remove Make sure Ignition spark plug from cylinder Reattach the spark plug Switch is in start wire and lay spark plug on top of cylinder with the position I metal part of plug touching the cylinder Pull the starter rope and watch for spark at spark plug tip If 2 Flooded engine there is no spark repeat test with a new spark plug 2 With the Ignition Switch off remove spark plug Move choke lever to run position pushed in com pletely and pull starter cord 15 to 20 times This will clear excess fuel from engine Clean and reinstall spark plug Set Ignition Switch to run 1 position Push and fully release primer bulb 7 times Pull starter three times with choke lever at run If engine does not start move choke lever to choke and repeat normal starting procedure If engine still fails to start repeat procedure with a new spark plug Engine starts but will Carburetor requires L Low jet Contact a Homelite Service Center for carburetor not accelerate properly adjustment adjustment Engine starts but will Carburetor requires High jet Contact a Homelite Service Center for carburetor not run properly at high adjustme
5. S OBLIGATION UNDER THIS WARRANTY IS STRICTLY AND EXCLUSIVELY LIMITED TO THE REPAIR OR REPLACEMENT OF DEFECTIVE PARTS AND HOMELITE DOES NOT ASSUME OR AUTHORIZE ANYONE TO ASSUME FOR THEM ANY OTHER OBLIGATION SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU HOMELITE ASSUMES NO RESPONSIBILITY FORINCIDENTAL CONSEQUENTIAL OR OTHER DAMAGES INCLUDING BUT NOT LIMITED TO EXPENSE OF RETURNING THE HOMELITE PRODUCT TO AN AUTHORIZED SERVICE DEALER AND EXPENSE OF DELIVERING IT BACK TO THE OWNER MECHANIC S TRAVEL TIME TELEPHONE OR TELEGRAM CHARGES RENTAL OF ALIKE PRODUCT DURING THE TIME WARRANTY SERVICE IS BEING PERFORMED TRAVEL LOSS OR DAMAGE TO PERSONAL PROPERLY LOSS OF REVENUE LOSS OF USE OF THE PRODUCT LOSS OF TIME OR INCONVENIENCE SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights any you may also have other rights which vary from state to state This warranty applies to all HOMELITE products manufactured by HOMELITE and sold in the United States and Canada To locate your nearest service dealer dial 1 800 242 4672 or log on to our website at www homelite com CALIFORNIA EMISSION CONTROL LIMITED WARRANTY STATEMENT YOUR WARRANTY RIGHTS AND OBLIGATIONS HOMELITE CONSUMER PRODUCTS INC The U S Environmental Protectio
6. See Figures 9 and 10 Use HOMELITE Bar and Chain Oil It is designed for chains and chain oilers and is formulated to perform over a wide temperature range with no dilution required Chain saw should use approximately one tank of oil per tank of fuel Note Do not use dirty used or otherwise contaminated oils Damage may occur to the oil pump bar or chain 1 Carefully pour the bar and chain oil into the tank 2 Fill the oil tank every time you fuel the engine OPERATING THE CHAIN BRAKE See Figures 10 11 and 12 Refer to Safety earlier in this manual for additional information Check the operating condition of the chain brake prior to each use 1 Using the back of your left hand engage the chain brake by pushing the chain brake lever hand guard toward the bar while the chain is rotating rapidly 2 Reset the chain brake back into the RUN position by grasping the top of the chain brake lever hand guard and pull toward the front handle until you hear a click A WARNING If the chain brake does not stop the chain immediately take the saw to a Homelite Service Center for repair prior to use BRAKE POSITION Page 11 OPERATION STARTING THE ENGINE See Figures 13 through 19 A WARNING Keep your body to the left of the chain line Never straddle the saw or chain or lean over past the chain line 1 Place the chain saw on level ground and ensure that no objects or obstructions are in the immedi
7. Yard Broom Trimlite and Bandit Two years for all other Homelite products if the product is used for personal family or household use 90 days if any of the above products are used for any other purpose such as commercial or rental This warranty extends to the original retail purchaser only and commences on the date of the original retail purchase Any part of the HOMELITE product manufactured or supplied by HOMELITE and found in the reasonable judgment of HOMELITE to be defective in material or workmanship will be repaired or replaced by an authorized HOMELITE service dealer without charge for parts and labor The HOMELITE product including any defective part must be returned to an authorized service dealer within the warranty period The expense of delivering the HOMELITE product to the dealer for warranty work and the expense of returning it back to the owner after repair or replacement will be paid by the owner HOMELITE S responsibility in respect to claims is limited to making the required repairs or replacements and no claim of breach of warranty shall be cause for cancellation or rescission of the contract of sale of any HOMELITE product Proof of purchase will be required by the dealer to substantiate any warranty claim All warranty work must be performed by an authorized HOMELITE service dealer This warranty is limited to ninety 90 days from the date of original retail purchase for any HOMELITE product that is used f
8. binding Page 24 MAINTENANCE ADJUSTING THE CHAIN TENSION See Figures 52 53 and 54 A WARNING Never touch or adjust the chain while the motor is running The saw chain is very sharp Always wear protective gloves when performing maintenance on the chain 1 Stop the engine before setting the chain tension 2 Make sure the guide bar mounting nuts are loosened to finger tight turn the chain tensioner clockwise to tension the chain Note A cold chain is correctly tensioned when there is no slack on the underside of the guide bar the chain is snug and it can be turned by hand without binding 3 Retension the chain whenever the flats on the drive links hang out of the bar groove Note During normal saw operation the temperature of the chain increases The drive links of a correctly tensioned warm chain will hang approximately 050 in 1 25 mm out of the bar groove To help determine the correct warm chain tension use the tip of the combina tion wrench as a guide Note New chain tends to stretch check the chain tension frequently and tension as required A CAUTION A chain tensioned while warm may be too tight upon cooling Check the cold tension before next use FLATS ON DRIVE LINKS 050 1 25 mm 050 1 25 mm 4 CHAIN MAINTENANCE See Figures 55 and 56 A CAUTION Check that the Ignition Switch is in the OFF O position before you work on the saw Use
9. so that your body is to the left A WARNING of the chain line CHAIN LINE DO NOT operate the throttle trigger with your left hand and hold the front handle with your right hand Never allow any part of your body to be in the chain line while operating a saw A WARNING Never use a left handed cross handed grip or any stance that would place your body or arm across the chain line PROPER CUTTING STANCE See Figure 24 Bi Maintain a proper grip on the saw whenever the engine Balance your weight with both feet on solid ground is running The fingers should encircle the handle and E Keep left arm with elbow locked in a straight arm the thumb is wrapped under the handlebar This grip is position to withstand any kickback force least likely to be broken by a kickback or other sudden reaction of the saw Any grip in which the thumb and fingers are on the same side of the handle is dangerous because a slight kick of the saw can cause loss of did STRAIGHT THUMB ON CHAIN LINE ARM UNDERSIDE OF HANDLE BAR E Keep your body to the left of the chain line Keep your thumb on underside of handlebar Page 14 OPERATION BASIC OPERATING CUTTING PROCEDURES Practice cutting a few small logs using the following technique to get the feel of using your saw before you begin a major sawing operation 1 T Take the proper stance in front of the wood with the saw idling Accelerate the engine to full th
10. thread the new spark plug turning it clockwise Note Be careful not to cross thread the spark plug Cross threading will seriously damage the product FUEL FILTER Fig 76 Note Depending on the type of fuel used the type and amount of oil used and or your operating conditions the exhaust port and muffler may become blocked with carbon deposits If you notice a power loss with your gas powered tool you may need to remove these deposits to restore performance We highly recommended that only qualified service technicians perform this service Page 31 MAINTENANCE CLEANING THE SPARK ARRESTING MUFFLER See Figure 78 The muffler is equipped with a spark arrestor screen A faulty spark arrestor screen can create a fire hazard Through normal use the screen can become dirty and should be inspected weekly and cleaned as required Always keep the muffler and spark arrestor on your saw in good condition A WARNING Muffler surfaces are very hot during and after operation of the chain saw keep all body parts away from the muffler Serious burns may occur if contact is made with the muffler 1 Allow the muffler to cool 2 The spark arrestor screen is retained by the deflector Remove the nuts and screen retainer to access the spark arrestor screen 3 Replace the spark arrestor screen if it is cracked or otherwise deteriorated SPARK ARRESTOR SCREEN MUFFLER CHAIN BRAKE See Figures 79 and 80 Rem
11. CTION See Figure 35 Bucking is the term used for cutting a fallen tree to the HORIZONTAL desired log length M CUT Cut only one log at a time Support small logs on a saw horse or another log while bucking Fig 34 E Keep a clear cutting area Make sure that no objects can contact the guide bar nose and chain during KICKBACK cutting this can cause kickback To avoid the danger keep the SAFE T TIP anti kickback device attached while cutting Refer to Specific Safety Rules Kick back earlier in this manual BI During bucking operations stand on the uphill side so that the cut off section of the log cannot roll over you Sometimes it is impossible to avoid pinching with just standard cutting techniques or difficult to predict which way a log will settle when cut BUCKING WITH A WEDGE See Figure 36 If the wood diameter is large enough for you to insert a soft bucking wedge without touching the chain you should use the wedge to hold the cut open to prevent pinching Note When bucking or felling with a wedge you may need to remove the SAFE T TIP anti kickback device to allow the bar to be drawn through the cut After you complete reinstall the tip Page 19 OPERATION BUCKING LOGS UNDER STRESS See Figure 37 Make the first bucking cut 1 3 of the way through the log and finish with a 2 3 cut on the opposite side As you cut the log it will tend to bend
12. ES SAFE T TIP ANTI KICKBACK NOSE GUARD See Figure 3 The SAFE T TIP prevents kickback because it covers the tip of the bar where rotational kickback is generated Inexperienced persons should never attempt to cut when the SAFE T TIP has been removed from the bar tip SAFE T TIP Users such as professional loggers who need to draw the tip through the cut make boring cuts or cut logs bigger than the bar length should reinstall the SAFE T TIP as soon as those cuts are complete When cutting without the SAFE T TIP the user must use proper techniques as shown in the manual to avoid kickback Note Refer to Maintenance later in this manual for instructions on reinstalling the SAFE T TIP nose guard LOW KICKBACK SAW CHAIN The rakers depth gauges ahead of each cutter can minimize the force of a kickback reaction by preventing the cutters from digging in too deeply at the kickback zone Only use replacement chain that is equivalent to the original chain or has been certified as a low kickback chain As saw chains are sharpened they lose some of the low kickback qualities and extra caution is required GUIDE BARS Generally guide bars with small radius tips have some what lower kickback potentials When making a replacement be sure to order one of the Homelite bars listed for your saw in this operator s manual The proper size SAFE T TIP nose guard comes installed on the bar Use only guide bars that have
13. HAN 30 feathered edge dulls quickly SIDE PLATE ANGLE See Figure 63 CORRECT 80 Produced automatically if you use the correct diameter file in the file holder HOOK Grabs and dulls quickly increases the potential of KICKBACK Results from using a file with a diameter too small or a file held too low INCORRECT BACKWARD SLOPE Needs too much feed pressure causes excessive wear to the bar and chain MAINTAINING DEPTH GAUGE CLEARANCE See Figure 64 65 and 66 Results from using a file with a diameter too large or file CORRECT BACKWARD SLOPE held too high B Maintain the depth gauge at a clearance of 025 in 0 6 mm Use a depth gauge tool for checking the TOP PLATE FILING ANGLE depth gauge clearances 30 E Every time the chain is filed check the depth gauge dii clearance E Use a flat file and a depth gauge jointer to lower all C A gauges uniformly Use a 025 in 0 6mm depth gauge jointer After lowering each depth gauge restore original CORRECT shape by rounding the front Be careful not to damage adjoining drive links with the edge of the file LESS THAN 30 MORE THAN 30 E Depth gauges must be adjusted with the flat file in the same direction the adjoining cutter was filed with the round file Use care not to contact cutter face with flat file when adjusting depth gauges DEPTH GAUGE INCORRECT DEPTH GAUGE JOINTER
14. Homelite OPERATOR S MANUAL UT10560 16 in 406 mm 38cc Chain Saw UT10550 18 in 457 mm 45cc Chain Saw UT10570 20 in 508 mm 45cc Chain Saw Your new chain saw has been engineered and manufactured to Homelite s high standard for dependability ease of operation and operator safety Properly cared for it will give you years of rugged trouble free performance Thank you for buying a Homelite chain saw SAVE THIS MANUAL FOR FUTURE REFERENCE TABLE OF CONTENTS e General Safety Rules 3 4 B Specific Safety Rules eme frate la iba ferte sut E A 4 5 6 7 T Operation e ie 9 21 22 32 B Bar and Chain Combinations oae Ene HARE RE aC SX AREA XXE RR KR DA SER RR RA eae 33 TrOUDIESHOOUING mE 33 34 VA ALY ase soe es besten 35 E Parts Ordering S6rvice ies 36 INTRODUCTION IMPORTANT Servicing requires extreme care and knowledge and A WARNING should be performed only by a
15. S OF YOUR BODY away from the saw chain when the engine is running ALWAYS CARRY THE CHAIN SAW WITH THE ENGINE STOPPED AND THE BRAKE ENGAGED the guide bar and saw chain to the rear and the muffler away from your body When transporting the chain saw use the appropriate guide bar scabbard DO NOT OPERATE A CHAIN SAW THAT IS DAMAGED improperly adjusted or not completely and securely assembled Be sure that the saw chain stops moving when the throttle control trigger is released SHUT OFF THE ENGINE before setting the chain saw down DO NOT leave the engine running unattended As an additional safety precaution apply the chain brake prior to setting down the saw USE EXTREME CAUTION when cutting small size brush and saplings because slender material may catch the saw chain and be whipped toward you or pull you off balance WHEN CUTTING A LIMB that is under tension be alert for springback so that you will not be struck when the tension in the wood fibers is released KEEP THE HANDLES dry clean and free of oil or fuel mixture OPERATE THE CHAIN SAW ONLY in well ventilated areas DO NOT OPERATE A CHAIN SAW IN ATREE unless you have been specifically trained to do so GENERAL SAFETY RULES ALL CHAIN SAW SERVICE other than the items listed in the instruction manual and all maintenance should be performed by competent chain saw service personnel For example if improper tools are used to remove the flywheel or if an improper to
16. a provision for mounting the SAFE T TIP CHAIN BRAKE See Figures 4 and 5 Chain brakes are designed to quickly stop the chain from rotating When the chain brake lever hand guard is pushed toward the bar the chain should stop immedi ately A chain brake does not prevent kickback The chain brake should be cleaned and tested before each use Refer to Operation Operating the Chain Brake later in this manual for additional information A WARNING Even with daily cleaning of the mechanism the dependability of a chain brake to perform under field conditions cannot be certified Keep the SAFE T TIP nose guard on your saw s guide bar and use proper cutting techniques RUN POSITION POSITION A WARNING KICKBACK occurs when the moving chain contacts an object at the upper portion of the tip of the guide bar or when the wood closes in and pinches the saw chain in the cut Contact at the upper portion of the tip of the guide bar can cause the chain to dig into the object and stop the chain for an instant The result is a lightning fast reverse reaction which kicks the guide bar up and back toward the operator If the saw chain is pinched along the top of the guide bar the guide bar can be driven rapidly back toward the operator Either of these reactions can cause loss of saw control which can result in serious injury Do not rely exclusively upon the safety devices built into your saw As a chain saw user you s
17. acity 19 4 oz 575 ml Chain gauge 050 in 1 25 mm Oil tank 11 8 oz 350 ml UT10560 Weight No bar chain fuel or oil 9 7 Ibs 4 4 kg Drive 7 tooth Fuel tank volume 19 4 oz 575 ml Engine displacement 2 75 cu in 45cc Chain oil tank volume 11 8 oz 350 ml Maximum engine power 2 5HP 1 9KW 9 000 RPM Bar length TET 16 in 406 mm Idle engine speed 2 600 3 400 RPM Chain pitch senes 0 325 in 8 3 mm Fuel tank capacity 19 4 oz 575 ml Chain gauge 050 in 1 25 mm Oil tank 11 8 oz 350 ml Page 7 FEATURES TRIGGER RELEASE CHAIN OIL FRONT HAND CAP GUARD CHAIN BRAKE FRONT HANDLE CYLINDER BAR MOUNTING NUTS CHOKE LEVER PRIMER BULB STARTER GRIP STARTER FAN HOUSING REAR SWITCH o FUEL CAP THROTTLE TRIGGER Page 8 OPERATION A WARNING The warnings and instructions in this section of the operator s manual are for your safety and to prevent serious personal injury UNDERSTANDING YOUR CHAIN SAW SAFETY DEVIC
18. and 2 cycle oil Pre mix unleaded gasoline and 2 cycle engine oil in a clean container approved for gasoline This engine is certified to operate on unleaded gasoline intended for automotive use with an octane rating of 87 2 or higher E Do not use any type of pre mixed gasoline oil from fuel service stations this includes the pre mixed gasoline oil intended for use in mopeds motorcycles etc Use a high quality 2 cycle self mixing oil for air cooled engines DO NOT use automotive oil or 2 cycle out board oil Mix 2 oil into the gasoline This is a 50 1 ratio Mix the fuel thoroughly and each time before fueling Mix in small quantities Do not mix quantities larger than usable in a 30 day period A 2 cycle oil containing a fuel stabilizer is recommended N 50 1 Mei FUEL MIX iN FILLING THE TANK See Figure 8 Refer to Specific Safety Rules Refueling earlier in this manual for additional safety information 1 Clean the surface around fuel cap to prevent contamina tion 2 Loosen the fuel cap slowly 3 Carefully pour the fuel mixture into the tank Avoid spillage 4 Prior to replacing the fuel cap clean and inspect the gasket 5 Immediately replace the fuel cap and hand tighten Wipe up any fuel spillage Note It is normal for the engine to emit smoke during and after the first use Ny 50 1 Mo m FUEL mix J Page 10 OPERATION ADDING OIL
19. at could be hit while you are operating the saw 4 Cut at high engine speeds Always cut with the a engine running at full speed Fully squeeze the throttle trigger and maintain a steady cutting speed 5 Do not overreach or cut above chest height 6 Follow the manufacturer s sharpening and maintenance instructions for the saw chain a 7 Only use replacement bars and chains specified by the manufacturer or the equivalent Page 3 DO NOT OPERATE A CHAIN SAW WITH ONE HAND Serious injury to the operator helpers bystanders or any combination of these persons may result from one handed operation A chain saw is intended for two handed use DO NOT OPERATE A CHAIN SAW WHEN YOU ARE FATIGUED Never operate a chain saw when you are tired or under the influence of medication drugs or alcohol USE SAFETY FOOTWEAR Wear snug fitting clothing protective gloves and eye hearing and head protection devices DO NOT STAND ON ANY UNSTABLE SURFACE while using your chain saw that includes ladders scaffolds trees etc USE CAUTION WHEN HANDLING FUEL Move the chain saw at least 30 feet 9 m from the fueling point before starting the engine DO NOT ALLOW OTHER PERSONS to be near the chain saw when starting or cutting with the chain saw Keep bystanders and animals out of the work area DO NOT START CUTTING until you have a clear work area secure footing and a planned retreat path from the falling tree KEEP ALL PART
20. ate vicinity that could come in contact with the bar and chain 2 Hold the front handle firmly with the left hand and put your right foot onto the base of the rear handle STARTER IGNITION SWITCH IN THE RUN POSITION 3 Set the Ignition Switch to the RUN 1 position 4 Make sure the chain brake is in the RUN position by pulling back on the lever hand guard See Figure 15 5 Fully press and release the PRIMER BULB 7 times 6 Pull CHOKE lever all the way OUT to full position The partial throttle position is automatically set when the choke lever is set at full choke RUN POSITION CHOKE LEVER Page 12 OPERATION CHOKE LEVER 7 When the temperature is above 50 F pull the STARTER GRIP until the engine attempts to start but no more than 3 times When the temperature is below 50 F pull the STARTER GRIP until the engine attempts to start but no more than 5 times 8 Push CHOKE lever all the way IN See Figure 18 9 Pull the STARTER GRIP until engine runs Note Allow the saw to run in this position 15 30 seconds depending upon the temperature 10 SQUEEZE and release the throttle trigger to return the engine to idle A CAUTION Failure to release partial throttle when chain brake lever is in the brake position will result in serious damage to the unit Never squeeze and hold the throttle trigger while the chain brake is in the brake position TRIGGER RELEASE THROTTLE TRIGGER Now yo
21. e your grip and to protect your hands Page 4 Do not operate a chain saw in a tree Do not cut from a ladder this is extremely dangerous Keep bystanders and animals out of the work area Do not allow other persons to be nearby during starting or cutting with the chain saw Note The size of the work area depends on the job being performed as well as the size tree or workpiece involved For example felling a tree requires a larger work area than making other cuts i e bucking cuts etc SPECIFIC SAFETY RULES PUSH AND PULL See Figure 1 The reaction force is always opposite to the direction the chain is moving Thus the operator must be ready to control the PULL when cutting on the bottom edge of the bar and the PUSH when cutting along the top edge Note Your chain saw has been fully factory tested It is normal to find some slight oil residue on the saw MAINTENANCE PRECAUTIONS Never operate a chain saw that is damaged improperly adjusted or is not completely and securely assembled Be sure that the saw chain stops moving when the throttle control trigger is released If the saw chain moves at idle speed the carburetor may need adjusting Refer to Operation later in this manual If the saw chain still moves at idle speed after adjustment has been made contact a Homelite Service Center for adjustment and discontinue use until the repair is made A WARNING All chain saw service other than items in the op
22. erator s manual maintenance instructions should be performed by competent chain saw service personnel If improper tools are used to remove the flywheel or clutch or if an improper tool is used to hold the flywheel in order to remove the clutch structural damage to the flywheel could occur which could subsequently cause the flywheel to burst and serious injury could result KICKBACK Kickback is a dangerous reaction that can lead to serious injury Do not rely only on the safety devices provided with your saw As a chain saw user you must take special safety precautions to help keep your cutting jobs free from accident or injury Note See the Operation section later in this manual for added information on kickback and how to avoid serious personal injury Page 5 SYMBOLS Important Some ofthe following symbols may be used on yourtool Please study them and learn their meaning Proper interpretation of these symbols will allow you to operate the tool better and safer SYMBOL NAME EXPLANATION Indicates danger warning or caution It means A attention Your safety is involved Your manual contains special messages to bring attention to potential safety concerns machine damage Read Your Operators Manual as well as helpful operating and servicing information Please read all the information carefully to avoid injury and machine damage Wear eye hearing and head protection when operating Eye Hearing a
23. erator s manual carefully Learn the saw s applications and limitations as well as the specific potential hazards related to this tool a KICKBACK MAY OCCUR WHEN THE NOSE OR OF THE GUIDE BAR touches an object or when the wood closes in and pinches the saw chain in the cut a Tip contact in some cases may cause a lightning fast reverse reaction kicking the guide bar up and back toward the operator Pinching the saw chain along the H top of the guide bar may push the guide bar rapidly back toward the operator Either of these reactions may cause you to lose control of the saw which could result in serious personal injury DO NOT rely exclusively upon the safety devices built into your saw As a chain saw user you should take several steps to keep your E cutting jobs free from accident or injury 1 With a basic understanding of kickback you can reduce or eliminate the element of surprise Sudden surprise contributes to accidents 2 Keep a good firm grip on the saw with both hands when the engine is running Place your right hand on the rear handle and your left hand on the front handle with your thumbs and fingers encircling the chain saw handles A firm grip together with a stiff E left arm will help you maintain control of the saw if kickback occurs 3 Make sure that the area in which you are cutting is free from obstructions DO NOT let the nose of the E guide bar contact a log branch fence or any other obstruction th
24. formed at an authorized dealer parts and labor Page 35 ite OPERATOR S MANUAL UT10560 16 in A06 mm 38cc Chain Saw UT10550 18 in 457 mm 45cc Chain Saw UT10570 20 in 508 mm 45cc Chain Saw WARNING The engine exhaust from this product contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm CALIFORNIA PROPOSITION 65 For product information technical help dealer locations or parts ordering information visit our website at www homelite com HOMELITE CONSUMER PRODUCTS INC 1428 Pearman Dairy Road Anderson SC 29625 Post Office Box 1207 Anderson SC 29622 Phone 1 800 chainsaw 1 800 242 4672 www homelite com 983000 420
25. hould take several steps to keep your cutting jobs free from accident or injury Page 9 OPERATION KICKBACK PRECAUTIONS See Figures 6 and 7 Rotational kickback occurs when the moving chain con tacts an object at the Kickback Danger Zone of the guide bar The result is a lightning fast reverse reaction which kicks the guide bar up and back towards the operator This reaction can cause loss of control which can result in serious injury KICKBACK DANGER ROTATIONAL KICKBACK A WARNING Always shut off engine before fueling Never add fuel to a machine with a running or hot engine Move at least 30 ft 9 m from refueling site before starting the engine DO NOT SMOKE Failure to heed this warning can result in possible personal injury FUEL AND REFUELING HANDLING THE FUEL SAFELY See Figure 8 A WARNING Check for fuel leaks if any are found correct them before using the saw to prevent fire or burn injury Always handle fuel with care it is highly flammable Always refuel outdoors and do not inhale fuel vapors E Do not let gasoline or oil come in contact with skin E Keep gasoline and oil away from the eyes If gasoline or oil comes in contact with the eyes wash them immediately with clean water If irritation is still present see a doctor immediately BI Clean up spilled fuel immediately MIXING THE FUEL Bi This product is powered by a 2 cycle engine and requires pre mixing gasoline
26. ides of filter A CAUTION Never run the engine without the air filter serious damage could result Make sure the air filter is correctly placed in the air filter cover before reassembly CYLINDER COVER AIR FILTER RETAINING FAN HOUSING BAFFLE PRE FILTER STARTER ASSEMBLY Page 30 MAINTENANCE CLEANING THE STARTER UNIT See Figure 73 Use a brush or compressed air to keep the cooling vents of the starter assembly free and clean of debris CLEAN FLYWHEEL FINS CHECKING THE FUEL FILTER See Figure 76 Check the fuel filter periodically Replace it if contaminated or damaged CLEANING THE ENGINE See Figures 74 and 75 Clean the cylinder fins and flywheel fins with compressed air or a brush periodically Dangerous overheating of the engine may occur due to impurities on the cylinder A WARNING Never run the saw without all the parts including the drivecase cover and starter housing securely in place Because parts can fracture and pose a danger of thrown objects leave repairs of the flywheel and clutch to trained Homelite Service Center personnel REPLACING THE SPARK PLUG See Figure 77 This engine uses a Champion RCJ 4 with 025 in 0 63 mm electrode gap Use an exact replacement and replace every six months or more frequently if necessary 1 Loosen the spark plug by turning it counterclockwise z with a wrench TA WM 2 Remove the spark plug CYLINDER FINS as 3 Hand
27. is made A WARNING THE SAW CHAIN SHOULD NEVER TURN AT IDLE Turn the idle speed screw T counterclockwise to reduce the idle RPM and stop the chain or contact a Homelite Service Center for adjustment and discontinue use until the repair is made Serious personal injury may result from the saw chain turning at idle A WARNING Weather conditions and altitude may affect carburetion Do not allow bystanders close to the chain saw while adjusting the carburetor FELLING TREES HAZARDOUS CONDITIONS A WARNING Do not fell trees during periods of high wind or heavy precipitation Wait until the hazardous weather has ended When felling a tree it is important that you heed the following warnings to prevent possible serious injury E Do not cut down trees having an extreme lean or large trees with rotten limbs loose bark or hollow trunks Have these trees pushed or dragged down with heavy equipment then cut them up E Do not cut trees near electrical wires or buildings Check the tree for damaged or dead branches that could fall and hit you during felling E Periodically glance at the top of the tree during the backcut to assure the tree is going to fall in the desired direction E f the tree starts to fall in the wrong direction or if the saw gets caught or hung up during the fall leave the saw and save yourself Page 16 OPERATION PROPER PROCEDURE FOR TREE FELLING See Figures 30 31 32 a
28. lance or control of the saw SPRINGPOLE E When pruning trees it is important not to make the flush cut next to the main limb or trunk until you have cut off the limb further out to reduce the weight This prevents stripping the bark from the main member See Figure 39 1 Underbuck the branch 1 3 through for your first cut 2 Overbuck the branch to drop it 3 Finish by cutting smoothly and neatly against the main member so the bark will grow back to seal the wound A WARNING Springpoles are dangerous and could strike the A WARNING If the limbs to be pruned are above chest height hire a operator causing the operator to lose control of the professional to perform the pruning chain saw This could result in severe or fatal injury to the operator CUTTING SPRINGPOLES See Figure 40 A springpole is any log branch rooted stump or sapling which is bent under tension by other wood so that it springs back if the wood holding it is cut or removed On a fallen tree a rooted stump has a high potential of spring ing back to the upright position during the bucking cut to separate the log from the stump Watch out for spring poles they are dangerous Page 21 MAINTENANCE ASSEMBLING THE BAR AND CHAIN See Figures 41 through 51 A DANGER Never start the engine before installing the guide bar chain drivecase cover and clutch drum Without all these parts in place the clutch can fly off
29. n Agency EPA the California Air Resources Board CARB and Homelite Consumer Products Inc are pleased to explain the Emission Control System Warranty on your utility lawn garden equipment engine The California new 1995 and later utility lawn garden equipment engines must be designed built and equipped to meet the state s stringent anti smog standards In other states new 1997 and later model year utility lawn garden equipment engines must be designed built and equipped at the time of sale to meet the U S EPA regulations for small non road engines The equipment engine must be free from defects in material and workmanship which cause it to fail to conform with U S EPA standards for the first two years of engine use from the date of sale to the ultimate purchaser Homelite Consumer Products Inc must warranty the emission control system on your utility lawn garden equipment engine for the period of time listed above provided there has been no abuse neglect or improper maintenance of your utility lawn garden equipment engine Your emission control system may include parts such as the carburetor or fuel injection system the ignition system the catalytic converter Also included may be hoses belts and connectors and other emission related assemblies Where a warrantable condition exists Homelite Consumer Products Inc will repair your utility lawn garden equipment engine at no cost to you including diagnosis if the diagnostic work is per
30. nd 33 OF 1 Pick your escape route or routes in case the in tended route is blocked Clear the immediate area around the tree and make sure there are no obstruc tions in your planned path of retreat Clear the path of safe retreat approximately 135 from the planned line of fall 2 Consider the force and direction of the wind the lean and balance of the tree and the location of large limbs These things influence the direction in which the tree will fall Do not try to fell a tree along a line different from its natural line of fall 3 Cut a notch about 1 3 the diameter of the trunk in the 135 FROM PLANNED LINE side of the tree Make the notch cuts so they intersect OF FALL at a right angle to the line of fall This notch should be PATH OF SAFE cleaned out to leave a straight line To keep the weight RETREAT of the wood off the saw always make the lower cut of the notch before the upper cut 4 Make the backcut level and horizontal and at a mini mum of 2 inches 5 cm above the horizontal cut of the notch PLANNED 135 PATH OF SAFE LINE OF FALL RETREAT 90 gt N HINGE 2 5 CN 1 DIA NOTCH APPROX 1 3 DIAMETER OF BACK CUT 2 5 CN Page 17 OPERATION Note Never cut through to the notch Always leave a band of wood between the notch and back cut approxi mately 2 inches 5 cm or 1 10 the diameter of the tree This is called hinge or hingewood It con
31. nd Head Protection this equipment The SAFE T TIP nose guard on the guide bar helps prevent kickback No Smoking No smoking sparks or open flame Diagonal line across a symbol means this is prohibited or should be avoided SAFE T TIP Nose Guard Prohibited Symbol Operate with Two Hands Hold and operate the saw properly with both hands One Handed Do not operate the saw using only one hand Engines produce carbon monoxide which is an odorless deadly poison Do not operate in an enclosed area Kickback Danger beware of kickback Bar Nose Contact Avoid bar nose contact Page 6 Carbon Monoxide SYMBOLS The purpose of safety symbols is to attract your attention to possible dangers The safety symbols and the explanations with them deserve your careful attention and understanding The safety warnings do not by themselves eliminate any danger The instructions or warnings they give are not substitutes for proper accident prevention measures Symbol Meaning A DANGER Indicates an imminently hazardous situation which if not avoided will result in death or serious injury Y WARNING Indicates a potentially hazardous situation which if not avoided could result in death or serious injury A CAUTION Indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may also be used to alert against unsafe practices that may cause property damage Note Advi
32. not fell trees near electrical wires or buildings Leave this operation for professionals Cut only when visibility and light are adequate for you to see clearly ADJUSTING THE CARBURETOR See Figures 26 and 27 Before adjusting the carburetor clean the air filter and the starter cover vents Allow the engine to warm up prior to carburetor adjustment Refer to Maintenance later in this manual AIR FILTER STARTER COVER VENTS The carburetor is factory set and should not require adjusting The carburetor will permit only limited adjust ment of the L Low Jet and H High Jet needles Any adjustment should be done by a Homelite Service Center Under no circumstances should the L Low Jet and H High Jet needles be forced outside the range of adjust ment A CAUTION Serious damage can occur to the engine if improper adjustments are made to the L and H needles Do not force the L and H needles outside the adjustment range Page 15 OPERATION ADJUSTING IDLE SPEED See Figure 28 B lf the engine starts runs and accelerates but will not idle turn the idle speed screw T clockwise to increase idle speed E If the chain turns at idle turn the idle speed screw counterclockwise to reduce the idle RPM and stop the chain movement If the saw chain still moves at idle speed contact a Homelite Service Center for adjust ment and discontinue use until the repair
33. nt adjustment speed Engine does not reach 1 Oil Fuel mixture is incorrect 1 Use fresh fuel and the correct 2 cycle oil mix ratio full speed and or emits 2 Air filter is dirty 2 Clean air filter Refer to Maintenance Cleaning excessive smoke the Air Filter earlier in this manual 3 Spark arrester screen is dirty 3 Clean spark arrestor screen Refer to Maintenance Cleaning the Spark Arresting Muffler earlier in this manual 4 Carburetor requires H High 4 Contact a Homelite Service Center for carburetor jet adjustment adjustment Page 33 TROUBLESHOOTING PROBLEM POSSIBLE CAUSE SOLUTION Engine starts runs and Carburetor requires adjustment Turn idle speed screw T clockwise to increase idle accelerates but will not speed See Figure 81 idle Chain turns at idle Carburetor requires adjustment Turn idle speed screw counterclockwise to decrease speed See Figure 81 1 Chain oil tank empty 1 Oil tank should be filled every time that fuel tank is Bar and chain running filled hot and smoking 2 Chain tension is too tight 2 Tension chain per instructions in Maintenance Adjusting the Chain Tension earlier in this manual 3 Oiler is not functioning 3 Run at half throttle 30 to 45 seconds Stop saw and check for oil dripping from SAFE T TIP and guide bar If oil is present the chain may be dull or bar may be damaged If no oil is on the SAFE T TIP contact a Homelite Service Ce
34. nter 1 Chain brake is engaged 1 Release chain brake refer to Operation Operat Engine starts and runs ing Chain Brake earlier in this manual but chain is not rotating 2 Chain tension is too tight 2 Tension chain per instructions in Maintenance Adjusting the Chain Tension earlier in this manual 3 Guide bar and chain as 3 Refer to Maintenance Assembling the Bar and sembled incorrectly Chain earlier in this manual 4 Guide bar and or chain are 4 Inspect guide bar and chain for damage damaged Note The carburetor adjustment needle s are equipped with plastic cap s that prevent counterclockwise rotation from the original factory adjustment If your product exhibits specific performance problem s where the Troubleshooting Section recommends a counterclockwise needle adjustment and you have made no adjustments since the original purchase take the product to a factory authorized service center for repair In most cases the needed adjustment is a simple task for the factory trained service representative Page 34 WARRANTY LIMITED WARRANTY STATEMENT Homelite Consumer Products Inc warrants to the original retail purchaser that this HOMELITE product is free from defect in material and workmanship and agrees to repair or replace at Homelite Consumer Products Inc s discretion any defective product free of charge within these time periods from the date of purchase One year for the following units
35. ol is used to hold the flywheel in order to remove the clutch structural damage to the flywheel could occur and subsequently could cause the flywheel to burst KEEP SAFE T TIP ANTI KICKBACK NOSE GUARD properly mounted on the guide bar to prevent rotational kickback FOLLOW THE SHARPENING and maintenance instructions for the saw chain USE ONLY THE REPLACEMENT GUIDE BARS and low kickback chains specified for your saw DO NOT adapt your powerhead to a bow guide or use it to power any attachments or devices not listed for your Saw SAVE THESE INSTRUCTIONS Refer to them fre quently and use to instruct other users If you loan someone this tool loan them these instructions also SPECIFIC SAFETY RULES A WARNING The warnings labels and instructions found in this section of the operator s manual are for your safety Failure to follow all instructions may result in serious personal injury GENERAL PRECAUTIONS DO NOT CUT VINES and or small underbrush less than 3 in 76 mm in diameter MUFFLER SURFACES ARE VERY HOT during and after operation of the chain saw keep all body parts away from the muffler Serious burns may occur if contact is made with the muffler Always hold the chain saw with both hands when the engine is running Use a firm grip with thumbs and fingers encircling the chain saw handles Never let anyone use your chain saw who has not received adequate instructions in its proper use This applies
36. only a low kickback chain on this saw This fast cutting chain provides kickback reduction when properly main tained For smooth and fast cutting maintain the chain properly The chain requires sharpening when the wood chips are small and powdery the chain must be forced through the wood during cutting or the chain cuts to one side During maintenance of the chain consider the following E Improper filing angle of the side plate can increase the risk of a severe kickback Page 25 MAINTENANCE SHARPENING THE CUTTERS See Figures 57 58 59 60 and 61 Be careful to file all cutters to the specified angles and to the same length as fast cutting can only be obtained when all cutters are uniform WB Raker depth gauge clearance 1 Too low increases the potential for kickback 2 Not low enough decreases cutting ability Wi f the cutter teeth hit hard objects such as nails and stones or are abraded by mud or sand on the wood have the Homelite Service Center sharpen the chain Note Inspect the drive sprocket for wear or damage when replacing the chain If signs of wear or damage are present in the areas indicated have the drive sprocket replaced by a Homelite Service Center Y RAKER CLEARANCE INSPECT DRIVE SPROCKET 1 2 Page 26 Wear gloves for protection Tension the chain prior to sharpening Note Refer to Maintenance Adjusting the Chain Tension earlier in this manual Use a 3
37. or 1 For access to the air filter and carburetor area loosen the three screws holding the cylinder cover 2 Activate chain brake 3 Lift the front of the cylinder cover past chain brake lever 4 Lift the back of the cylinder cover past the handle 5 Before removing the air filter from the carburetor blow or brush as much loose dirt and sawdust from around the carburetor and chamber as possible Note Make sure to pull the choke lever out to keep the carburetor from being contaminated 6 Remove the screw securing the air filter 7 Position a flat screw driver between the tabs and twist 8 Lift the air filter off the air filter base Choose one of the following cleaning options 9 To lightly clean tap the filter against a smooth flat surface to dislodge most saw dust and dirt particles 10 For a more thorough cleaning clean in warm soapy water rinse and let dry completely Note An alternate method is to clean the filter with compressed air always wear eye protection to avoid eye injury 11 Reinstall the air filter making sure that the tabs on the air filter are located in channels on the air filter bottom before tightening filter retainer screw Clean the pre filter every 25 tanks of fuel or sooner if required Remove the cylinder cover starter assembly and the fan housing baffle for access to the pre filter in the engine housing Note If you use an air hose for drying blow through both s
38. or rental or commercial purposes or any other income producing purpose This warranty does not cover any HOMELITE product that has been subject to misuse neglect negligence or accident or that has been operated in any way contrary to the operating instructions as specified in the HOMELITE operator s manual This warranty does not apply to any damage to the HOMELITE product that is the result of improper maintenance or to any HOMELITE product that has been altered or modified The warranty does not extend to repairs made necessary by normal wear or by the use of parts or accessories which are either INCOMPATIBLE WITH THE HOMELITE product or adversely affect its operation performance or durability In addition this warranty does not cover A Tune ups Spark Plugs Carburetor Carburetor Adjustments Ignition Filters B Wearitems Bump Knobs Spool Retainers Outer Spools Cutting Lines Inner Reels Starter Pulley Starter Ropes Drive Belts HOMELITE reserves the right to change or improve the design of any HOMELITE product without assuming any obligation to modify any product previously manufactured ALL IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE STATED WARRANTY PERIOD ACCORDINGLY ANY SUCHIMPLIED WARRANTIES INCLUDING MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE ARE DISCLAIMED IN THEIR ENTIRETY AFTER THE EXPIRATION OF THE APPROPRIATE TWO YEAR ONE YEAR OR NINETY DAY WARRANTY PERIOD HOMELITE
39. or explode exposing the user to possible serious injury A WARNING To avoid serious personal injury read and understand all the safety instructions in this section 1 Always place the Ignition Switch in the stop position before you work on the saw 2 Make sure the chain brake is not set by pulling the chain brake lever hand guard towards the front handle to the RUN position 3 Wear gloves when handling the chain and bar These components are sharp and may contain burrs 4 Remove the bar mounting nuts using a combination wrench or 5 8 in wrench 5 Remove the clutch cover and the outer guide bar plate RUN POSITION Page 22 COMBINATION WRENCH MOUNTING NUTS Fig 42 GUIDE BAR PLATE BAR MOUNTING NUTS Fig 43 MAINTENANCE 6 Lay out the saw chain in a loop and straighten any kinks The cutters should face in the direction of chain rotation If they face backwards turn the loop over 7 Place the chain drive links into the bar groove as shown in figure 46 8 Position the chain so there is a loop at the back of the bar 9 Hold the chain in position on the bar and place the loop around the sprocket 10 Fit the bar flush against the mounting surface so that the bar studs are in the long slot of the bar Note for UT10570 When placing the bar on the bar CHAIN DRIVE LINKS studs ensure that the adjusting pin is in the chain tension pin hole 11 Replace the outer guide ba
40. ove the clutch cover and clean the chain brake components Check wear on the brake band and replace if worn or deformed The band thickness should not be less than 0 024 in 60 mm or worn halfway through Always keep the chain brake mechanism clean and lightly lubricate the linkage Always test the chain brake performance after servicing or cleaning Refer to Operation Operating Chain Brake earlier in this manual for additional information E Check and if damaged replace the chain catcher CHAIN CATCHER CLUTCH COVER BRAKE BAND LUBRICATE THE CHAIN BRAKE LINKAGE ce CLEAN THE CHAIN BRAKE STORING THE CHAIN SAW 1 MONTH OR LONGER 1 Drain all fuel from tank into a container approved for gasoline 2 Run the engine until it stops This will remove all fuel oil mix that could become stale and leave varnish and gum in the fuel system 3 Drain all bar and chain oil from tank into a container approved for oil 4 Clean all foreign material from the saw 5 Store it in a well ventilated place that is inaccessible to children Note Keep away from corrosive agents such as garden chemicals and deicing salts Abide by all federal and local regulations for the safe storage and handling of gasoline Excess fuel can be used in other 2 cycle engine powered equipment requiring 50 1 ratio Page 32 BAR AND CHAIN COMBINATIONS UT10560 UT10550 Length of Bar Guide
41. qualified service technician When servicing use only identical Homelite replacement parts Carefully read through this entire operator s manual before using your new saw Pay close attention to the Safety Rules and all Safety Alert Symbols before using the chain saw Follow all safety safety rules are for your safety and to prevent of safe reliable service T Look for this symbol to point out important safety precautions It means attention Your safety is involved A WARNING The operation of any power tool can result in foreign objects being thrown into your eyes which can result in severe eye damage Before beginning tool operation always wear safety goggles or safety glasses with side shields and a full face shield when needed We recommend Wide Vision Safety Mask for use over eyeglasses or standard safety glasses with side shields Always wear eye protection which is marked to comply with ANSI Z87 1 Page 2 GENERAL SAFETY RULES A WARNING The warnings labels and instructions found in this section of the operator s manual are for your safety Failure to follow all instructions may result in serious personal injury Safe operation of this tool requires that you read and understand this operator s manual and all labels affixed to the tool Safety is a combination of using common sense staying alert and knowing how your saw works READ ALL INSTRUCTIONS KNOW YOUR TOOL Read the op
42. r plate ensuring that the bar pin groove is at the bottom with the upper and lower BAR STUDS edges angled away from the guide bar 12 Replace the clutch cover and bar mounting nuts 13 Tighten the bar mounting nuts finger tight only The bar must be free to move for tension adjustment CUTTERS CHAIN ROTATION gt ADJUSTING PIN FOR UT10570 _ CHAIN DRIVE LINKS BAR MOUNTING NUTS CLUTCH COVER Page 23 MAINTENANCE 14 Remove all slack from the chain using the chain tensioning screw Place a slotted screwdriver in the slot and turn clockwise until the chain seats snugly against the bar with the drive links in the bar groove UT10570 CHAIN TENSIONING SCREW UT10560 UT10550 15 Lift the tip of the guide bar up to check for sag 16 Release the tip of the guide bar and turn the chain tensioning screw 1 2 turn clockwise Repeat this process until sag does not exist 17 Hold the tip of the guide bar up and tighten the bar mounting nuts securely The chain is correctly tensioned when there is no sag on the underside of the guide bar the chain is snug but it can be turned by hand without binding Ensure that the chain brake is not set Note If chain is too tight it will not rotate Loosen the bar nuts slightly and turn the tension adjuster 1 4 turn counter clockwise Lift the tip of the guide bar up and retighten the bar mounting nuts securely Ensure that the chain will rotate without
43. rottle just before entering the cut by squeezing the throttle trigger Begin cutting with the saw against the log Keep the engine at full throttle the entire time you are cutting Allow the chain to cut for you exert only light downward pressure Forcing the cut could result in damage to the bar chain or engine Release the throttle trigger as soon as the cut is com pleted allowing the engine to idle Running the saw at full throttle without a cutting load can result in unneces sary wear to the chain bar and engine Do not put pressure on the saw at the end of the cut WORK AREA PRECAUTIONS See Figure 25 Cut only wood or materials made from wood no sheet metal no plastics no masonry no non wood building materials Never allow children to operate your saw Allow no person to use this chain saw who has not read this operator s manual or received adequate instructions for the safe and proper use of this chain saw Keep everyone helpers bystanders children and animals a SAFE DISTANCE from the cutting area During felling operations the safe distance should be a least twice the height of the largest trees in the felling area During bucking operations keep a minimum distance of 15 feet 4 5 m between workers Always cut with both feet on solid ground to prevent being pulled off balance Do not cut above chest height as a saw held higher is difficult to control against kickback forces Do
44. ses you of additional information concerning the operation or maintenance of the equipment SAVE THESE INSTRUCTIONS SPECIFICATIONS UT10550 Weight No bar chain fuel or oil 9 7 Ibs 4 4 kg Drive sprocket 7 tooth Fuel tank volume 19 4 oz 575 ml Engine displacement 2 75 cu in 45cc Chain oil tank volume 11 8 oz 350 ml Maximum engine power 2 5HP 1 9KW 9 000 RPM Bar 18 457 Idle engine speed 2 600 3 400 RPM Chain pitch 325 in 8 3 mm Fuel tank capacity 19 4 oz 575 ml Chain gauge ascendi 050 in 1 25 mm tank 11 8 oz 350 ml UT10570 Weight No bar chain fuel or oil 9 7 Ibs 4 4 kg Drive tt E RR E 7 tooth Fuel tank volume 19 4 oz 575 ml Engine displacement 2 75 cu in 45cc Chain oil tank volume 11 8 oz 350 ml Maximum engine power 2 5HP 1 9KW 9 000 RPM Bar lengtli iit metes 20 in 508 mm Idle engine speed 2 600 3 400 RPM Chain cette 325 in 8 3 mm Fuel tank cap
45. structed below These are specially hardened screws If you cannot install the screw tightly replace both the screw and the SAFE T TIP before further operation Note Do not replace the screw with an ordinary screw manufacturer s replacement parts should be used when replacing parts In addition to preventing chain contact with solid objects at the nose of the bar the SAFE T TIP also helps keep the chain away from abrasive surfaces such as the ground Keep it on the right hand side of the bar where it will be between the chain and the ground during flush with ground cutting The mounting screw requires a 5 16 in wrench or adjustable wrench to achieve the recommended tight ness of 35 to 45 in Ib 4 5 Nm A tightness within this range can be achieved by using the following method 1 Tighten the screw to a finger tight position 2 Tighten the screw an additional 3 4 of a turn using a wrench MOUNTING SAFE T TIP Fig 68 Page 29 MAINTENANCE TIGHTEN 3 4 OF MOUNTING THE SAFE T TIP NOSE GUARD See Figures 68 and 69 1 Mount the SAFE T TIP on the bar nose 2 Fit the locking rivet or tab in the recessed hole in the guide bar 3 Tighten the screw with your finger 4 From the finger tight position tighten the screw an additional 3 4 of a turn using a wrench CLEANING THE AIR FILTER See Figures 70 71 and 72 Note Always clean the air filter before making any mixture adjustments of the carburet
46. to rentals as well as privately owned saws L not contacting any object Operate the chain saw only in well ventilated areas SAFETY APPAREL Wear snug fitting clothing Always wear heavy long pants boots and gloves Do not wear jewelry short Before you start the engine make sure the saw chain is Wear eye protection which is marked to comply with ANSI Z87 1 as well as hearing and head protection when operating this equipment REFUELING DO NOT SMOKE To reduce the risk of fire and burn injury handle fuel with care It is highly flammable Mix and store fuel in a container approved for gasoline Mix fuel outdoors where there are no sparks or flames Select bare ground stop the engine and allow it to cool before refueling Loosen the fuel cap slowly to release pressure and to keep fuel from escaping around the cap Tighten the fuel cap securely after refueling Wipe spilled fuel from the unit Move 30 feet 9 m away from refueling site before starting engine Never attempt to burn off spilled fuel under any circum stances CUTTING WORK AREA pants sandals or go barefoot Do not wear loose fitting clothing which could be drawn into the engine or catch the chain or underbrush Wear overalls jeans or chaps made of cut resistant material or ones that contain cut resistant inserts Secure hair so that it is above shoul der level Wear non slip safety footwear and heavy duty gloves to improv
47. trols the fall of the tree and prevents slipping or twisting or shoot back of the tree off the stump On large diameter trees stop the back cut before it is deep enough for the tree to either fall or settle back on the stump Then insert soft wooden or plastic wedges into the cut so they do not touch the chain Drive wedges in little by little to help jack the tree over When bucking or felling with a wedge it may be necessary to remove the SAFE T TIP anti kickback device to allow the bar to be drawn through the cut After you complete the cut reinstall the tip immediately 5 As tree starts to fall stop the chain saw and put it down immediately Retreat along the cleared path but watch the action in case something falls your way A WARNING Never cut through to the notch when making a back cut The hinge controls the fall of the tree this is the section of wood between the notch and backcut Page 18 OPERATION REMOVING BUTTRESS ROOTS See Figure 34 A buttress root is a large root extending from the trunk of the tree above the ground Remove large buttress roots prior to felling Make the horizontal cut into the buttress first followed by the vertical cut Remove the resulting loose section from the work area Follow the correct tree felling procedure after you have removed the large VERTICAL CUT buttress roots Refer to Operation Proper Procedure for Tree Felling earlier in this manual LOOSE BUCKING SE
48. u are ready to pick up the saw Use the proper grip for both handles refer to Operation for additional information STOPPING THE ENGINE See Figures 20 and 21 Release the throttle trigger and let the engine return to idle To stop the engine move the Ignition Switch to the stop position Do not put the chain saw on the ground when the chain is still moving For additional safety set the chain brake when the saw is not in use In the event that the Ignition Switch will not stop the saw pull the choke lever out to the fully extended position See Figure 17 and engage chain brake to stop the engine If the Ignition Switch will not stop the saw when set to the stop O position have the Ignition Switch repaired before using the chain saw again to prevent unsafe conditions or serious injury Important When you are finished using the saw relieve tank pressures by loosening the CHAIN OIL and FUEL MIX caps Then retighten the caps Allow the engine to cool before storing IGNITION SWITCH IN THE STOP POSITION BRAKE POSITION Page 13 OPERATION PREPARING FOR CUTTING PROPER GRIP ON HANDLES See Figure 22 and 23 Refer to Specific Safety Rules Safety Apparel earlier in this manual for appropriate safety equipment E Wear non slip gloves for maximum grip and protection Hold the saw firmly with both hands Always keep your LEFT HAND on the front handle and your RIGHT HAND on the rear handle
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