Honda HRA21 User's Manual
Contents
1. 21 MAINTENANCE SCHEDULE Regular Service Period Perform at every indicated month First Every Every Every or operating hour intervals 1 month 1 month 6 months one year whichever occurs first or or or or 20 Hrs 20 Hrs 100 Hrs 300 Hrs Item Engine oil Check level O d 2 A eee pes heck Ax Check Fuel strainer Spark plug Clean Adjust Blade bolts Tightness Check Throttle cable Adjust Drive belt EM Inspection Drive clutch cable Adjust ROTO STOP cable Adjust ROTO STOP Check IA EE ON Ignition timing _ Check Adjust TI EE Valve clearance gt Check Adjust O lean L Combustion chamber S k Fuel tank Clean Check Fuel tube Replace if necessary Service the air cleaner more frequently when used in dusty areas These items should be serviced by an authorized Honda dealer unless the owner has the proper tools and is mechanically proficient See the Honda Shop Manual 22 ENGINE OIL CHANGE Drain the oil while the engine is still warm to assure rapid and complete draining 1 Remove the filler cap dipstick using a screwdriver as illustrated 2 Remove the drain bolt drain the oil and retighten the bolt securely 3 Refill to the Upper level mark with the recom meded oil see p 10 Tighten the cap securely to prevent leakage UPPER LOWER AIR2. 1 1 2 2 2 1 2 3 To change blade height 1 Stop the engine 2 Push the adjusting lever toward the wheel and move it up or down to raise or lower the blade height 3 Release the lever in the appropriate notch 4 Adjust the other three wheels Make sure all four wheels are at the same level Be careful not to touch the muffler when adjust ing the right front wheel height The muffler will stay hot for a while after the en gine is stopped Adjust all four wheels to the same level ADJUSTING LEVER Grass Bag The bag is subject to wear under normal usage fre quently check for fraying and tears Replace deterio rated bags only with Honda replacement bags or equivalent When the bag needs cleaning wash it with water and make sure it is dry before using it Clogged mesh will result in poor grass chuting and a wet bag will clog quickly Removale Remove the grass bag grip from handle pipe Push the door latch down Pull the grass bag rear ward while pushing the door latch down Installation Grab the grass bag handle set the lower edge of the bag onto the recess of the mower housing Push the grass bag handle forward until the for ward end of the handle rests on the latch groove Hang the grass bag grip onto the lower handlebar GRASS BAG HANDLE ECON B GRASS BAG GRIP GRASS BAG HANDLE TRANSPORTING STORAGE Preparation for Storage The following steps shou
3. 4 O ROTARY MOWER 21 GV150 Side valve single cylinder forced air cooled four stroke gasoline engine 144 cc 8 8 cu in 64 x 45 mm 2 52 x 1 77 in 20 BTDC Fixed Flywheel magneto ignition 0 6 1 0 63 US qt 1 0 1 0 26 US gal BMR 6A NGK W20MR U ND 1 585 x 540 x 975mm 62 4 x 21 3 x 38 4in SDA 44 5 kg 98 Ib SDAW TYPE 43 5 kg 96 Ib PDA 41 5 kg 91 Ib PDAW TYPE 40 5 kg 89 Ib 809 2 2 bu 540 mm 21 in 3196300 HONDA HONDA MOTOR CO LTD TOKYO JAPAN AH KO E A5008201 PRINTED IN JAPAN
4. 1 With the throttle lever in the position the carburetor control lever should be pulled all the way to the right Push the control lever with your finger to check whether it is all the way to the right 2 If adjustment is necessary loosen the lock nuts and turn them to run the adjuster up or down as re quired Tighten the lock nuts and recheck the Car buretor control lever position 3 Start the engine and make sure the engine stops when the throttle lever is moved to the STOP position Readjust the cable if necessary AS LOCK NUTS 52 DN 7 X 2 ADJUSTER ROTO STOP LEVER FREE PLAY TYPES 5 10mm 3 16 3 8 in 1 free play at the tip of the lever as shown it should be between 5 10 mm 3 16 3 8 in 2 If adjustment is necessary loosen the lock nuts and turn them to run the adjuster up or down as re guired Tighten the lock nuts and reckeck free play 3 Start the engine and operate the ROTO STOP lever Check to be sure the blade stops when the lever is released ADJUSTEF Z 28 LOCK NUTS DRIVE CLUTCH FREE PLAY SDA and SDAW TYPES eed Measure free play at the top of the lever as shown it should be between 7 12 mm 9 32 15 32 in If adjustment is necessary loosen the lock nuts and turn them to run the adjuster up or down as reguired Tighten the lock nuts and recheck free play Start the engine and check to be sure the drive clu
5. CLEANER SERVICE A dirty air cleaner will restrict air flow to the carbu retor To prevent carburetor malfunction service the al l 2 3 24 r cleaner freguently Remove the wing nuts and the air cleaner cover Remove the elements and separate them Carefully check both elements for holes or tears and replace if damaged Foam element Clean in warm soapy water rinse and allow to dry thoroughly Or clean in high flash point solvent and allow to dry Dip the ele ment in clean engine oil and squeeze out all the excess The engine will smoke during initial start up if too much oil is left in the foam Paper element Tap the element lightly several times on a hard surface to remove excess dirt or blow compressed air through the filter from the inside out Never try to brush the dirt off brushing will force dirt into the fibers Clean in warm soapy water and rinse Dry using compressed air blown from the inside out or shake the element and allow it to air dry thoroughly Or clean in high flash point solvent remove immediately and allow to dry Oil the outside of the paper with a light aero sol oil such as WD 40 The engine will smoke dur ing initial start up if too much oil is used PAPER ELEMENT WING NUTS FOAM ELEMENT SPARK PLUG Standard Plugs BMR 6A NGK or W20MR U ND 2 Disconnect the cap and remove the spark plug Visually inspect the plug Discard the plug if it is heavily
6. Click here to save this manual to your computer HONDA MOTOR CO LTD 1982 The HRA 21 meets CPSC blade safety reguirement for walkbehind rotary power mowers This manual covers operation and maintenance of the HONDA ROTARY MOWER HRA21 All information in this publication is based on the latest product information available at the time of approval for printing Honda Motor Co Ltd reserves the right to make changes at any time without notice and without incur ring any obligation Any powered product can be a potential source of danger if misused or improperly maintained Pay particular attention to statements preceded by the following words WARNING Indicates the possibility of personal injury or loss of life if instructions are not followed Indicates the possibility of equipment damage if instructions are not followed HONDA MOTOR CO LTD 1982 ALL RIGHTS RESERVED Thank you for purchasing Honda Lawn Mower If any problems occur or if there are any questions concerning the mower consult an authorized HONDA dealer No part of this publication may be reproduced without written permission WARNING The Honda rotary mower is designed to give safe and dependable service if operated according to instructions and intended use mowing cutting grass and bagging cut grass when equipped with the grass bag Any other use could be dangerous Read and understand the Owner s Manual before operating the mower Failu
7. Removal From Storage 1 3 4 Remove the spark plug check that it is clean and properly 25 Pull the starter sev eral times Thread the spark plug in as far as possible by hand then use the plug wrench to tighten 1 8 to 1 4 turn further Check the engine oil level and condition Fill the fuel tank and start the engine NOTE If the cylinder was coated with oil the engine will smoke at start up this is normal 20 STARTER HANDLE MAINTENANCE WARNING To prevent accidental start up shut off the engine and disconnect the spark plug cap before perform ing any maintenance Use only genuine Honda parts or their eguivalent for maintenance or repair Replacement parts which are not of eguivalent guality may damage the mower Periodic inspection and adjustment of the Honda HR A21 are essential it high level performance is to be maintained Regular maintenance will also help to extend service life The required service intervals the kind of maintenance to be performed are des cribed in the chart on the following page For longer service and greater efficiency keep the underside of the mower housing clean and free of ac cumulated grass clippings by washing it down with a hose after use and or cleaning it with a wire brush and scraper Remove any rust and apply a rust re sistant paint Cleaning and rust prevention are es pecially important before seasonal storage
8. c Release the clutch and push the mower while using the ROTO STOP for better directional control BEFORE YOU START THE MOWER 1 Check the engine oil level CAUTION Engine is a major factor affecting engine per formance and service life Non detergent or veget able oils are not recommended Running the engine with insufficient oil can cause serious engine damage Use Honda 4 stroke or an equivalent high deter gent premium quality motor oil certified to meet or exceed U S automobile manufacturers requirements for service classification SE or SF Motor oils clas sified SE or SF will show this designation on the container SAE 10W 40 is recommended for general all tem perature use If single viscosity oil is used select the appropriate viscosity for the average temperature in your area l A With the mower on a level surface remove the oil filler cap dipstick using a screwdriver as illustra ted B If the level is low add the recommended oil to the Upper mark on the dipstick Do not over fill excess oil will result in power loss and smok ing 10 UPPER OIL LEVEL LOWER OIL LEVEL 2 Check the fuel level Use regular or unleaded automotive gasoline of 86 pump octane or higher Never use an oil gasoline mixture or dirty gasoline Avoid getting dirt dust or water in the fuel tank Gasoline is extremely flammable and explosive un der certain conditions Refuel in a well ve
9. deposited or if the insulator is cracked or chipped Measure the plug gap with a wire type feeler gauge it should be 0 6 0 7 mm 0 024 0 028 in If ad justment is necessary bend the side electrode care fully Make sure the sealing washer is in good condition then thread the spark plug in by hand until it seats Use the wrench to tighten a new plug 1 2 turn fur ther to compress the washer If you are reusing the plug it should only take 1 8 1 4 turn after the plug seats Replace the spark plug cap 0 024 0 028 in BLADE REMOVAL AND SHARPENING WARNING Wear heavy gloves to protect your hands Before tilting the mower remove the spark plug cap 1 Tilt the mower so the carburetor side is up Loosen the blade bolts to remove the blade Never tilt the mower so the carburetor side is down It will result in hard starting 2 Sharpen the blade cutting edges with a file File the top side only Maintain the original bevel for a fine cutting edge File both ends evenly to main tain blade balance K NOTE S awe Use only a genuine HONDA replacement blade or 7 eguivalent j m 25 LT us A TTL SX 4 Install the blade so that the blade bolts are securely tightened with specified torque Torque 4 5 5 5kg 32 5 39 8 ft Ib Tr 3 Clean away any dirt and grass from around the blade shaft BLADE l 26 CONTROL CABLE ADJUSTMENT
10. ead etc be sure the blade blade holder woodruffkey fasten ers crankshaft etc are in good condition before continuing to Mow Replace any damaged parts COMPONENT IDENTIFICATION ROTO STOP LEVER GRASS BAG HANDLE FUEL TANK CAP RECOIL STARTER AIR CLEANER SPARK PLUG CAP THROTTLE LEVER CUTTING HEIGHT ADJUSTING LEVER 2 4 L Lf Y LA GRASS BAG ENGINE OIL DRAIN PLUG MUFFLER SDA Type DRIVE CLUTCH LEVER HANDLE GRASS BAG GRIP OIL FILLER CAP REAR SHIELD THE CONTROLS Throttle All TYPES HI IDLE STOP ROTO STOP All TYPES To put the cutting blade into operation press the button on top of the ROTO STOP lever and push the lever forward holding it against the handlebar The blade will stop when the ROTO STOP lever is released THROTTLE CONTROL LEVER Drive Clutch SDA SDAW TYPES For self propelled operation push the drive clutch lever forward and hold it against the handlebar ROTO STOP LEVER The drive clutch lever holds the ROTO STOP lever forward during self propelled operation The button on top of the ROTO STOP lever must be pressed before either of these levers can be moved forward the cutting blade must be put into operation when ever the mower is to be self propelled When the drive clutch lever is released the drive clutch is disengaged and the ROTO STOP lever is releas
11. ed TRACTION SPEED The mower has three speed settings for the self propelled operation and is delivered by the dealer in the intermediate speed setting Changing to a faster or slower speed should be accomplished by an authorized Honda dealer OPERATION The HRA21 may be used with the grass bag or dis charge adapter The following suggestions and rules are intended to help you operate your Honda HRA21 under the safest conditions possible Be alert and exercise the same care using the mower as you would using any other power tool WARNING Beespecially careful when mowing uneven or rough ground The mower may tilt exposing the blade and hidden objects could be thrown by the blade Keep all four wheels on the ground Use extra care when mowing around objects to keep the blade from striking them Never delibera tely mow over any object Stop the engine immediately if the blade hits an object or the mower Starts to vibrate Remove the spark plug cap keep the wire away from the plug and inspect for damage N OTE Mow across slopes Do not mow excessively steep slopes Always push never pull a mower with the engine running Control direction by the handle not by foot pressure on the mower housing Keep a firm hold on the handle and walk never run with the mower Don t lag behind the ma chine or let it pull you SDA and SDAW TYPES Do not use the drive clutch when maneuvering around trees et
12. ld be taken to protect the mower whenever it will be stored for longer than 30 Turn the fuel valve OFF when transporting the days Transporting mower 1 Drain the fuel tank and carburetor into an ap proved gasoline container A Remove the fuel tube and turn the fuel valve ON to empty the fuel tank AAA LAT FUEL VALVE WARNING To avoid fuel and oil spillage do not tilt the unit spilled fuel may ignite 18 Loosen the carburetor drain bolt to drain the carburetor C Retighten the drain bolt connect the fuel tube and turn the fuel valve OFF Gasoline is extremely flammable and explosive un der certain conditions Do not smoke or allow flames or sparks in the area 2 Change the engine oil p 23 NOTE If the mower will be stored for longer than a year remove the spark plug and pour three table spoonsful of clean motor oil into the cylinder Pull the starter rope slowly two or three times to distri bute the oil Replace the plug CYLINDER AP p K Ne lt NE lt 19 3 Pull the starter rope until resistance is felt This closes the valves and helps to protect the com bustion chamber from corrosion Remove dirt and debris from the underside of the mower housing Clean the mower thoroughly Paint areas that may rust with a rust resistant paint or coat with a light film of oil Cover the mower and store it on a level surface in a dry dust free area
13. ntilated area with the engine stopped Do not smoke or allow flames or sparks in the area where the mower is refueled or where gasoline is stored Be careful not to spill fuel when refueling Fuel vapor or spilled fuel may ignite Make sure the area is dry before starting the engine Do not overfill the tank and make sure the filler cap is securely closed after refueling Refuel when the engine is cold CAUTION Gasoline substitutes such as gasohol etc are not recommended they may be harmful to the fuel system com ponents 11 3 Check the grass bag for fraying tears and clogged mesh Wash the bag with water if necessary and let it dry thoroughly Grass will not chute proper ly without adeguate ventilation through the bag Make sure the lock lever is latched securely 4 Check the blade bolts for tightness Torque 4 5 5 5 kgm 32 5 39 8 ft Ib WARNING To be certain that the engine will not start acciden tally remove the spark plug cap before performing this inspection 5 Check and clean the air cleaner element if it is dirty p 24 12 AIR CLEANER STARTING THE ENGINE Exhaust gas contains poisonous carbon monoxide Never run the mower in an enclosed area Be sure to provide adeguate ventilation 1 Move the throttle lever to CHOKE NOTE Do not use CHOKE when the engine is warm or the air temperature is high Move the throttle to LO instead 2 Turn the f
14. r improperly gapped p 25 5 Engine flooded p 15 6 Dirty air cleaner Hard starting or loss of power Dirt in gas tank 2 Dirty air cleaner 3 Water in gas tank 4 Vent in gas cap and or carburetor clogged Erratic operation Spark plug faulty or improperly gapped p 25 2 Dirty air cleaner Engine overheats 1 Spark plug improperly gapped 2 Dirty air cleaner 3 Dirty cooling fins 4 Low oil level 5 Starter pulley clogged by grass etc Excessive vibration 1 Loose blade or engine mounting hardware 2 Blade unbalanced 33 SPECIFICATIONS 8 6 202 9 5 4 9 9 9 8 6 9 5 9 e 9 9 0 0 0 9 gt 9 9 4 op e 9 ef 8 8 Displacement Bore and stroke 9 9 Ignition timing Ignition system L2 wie RAE Engine oil capacity on cei ca ese PEE PS Fuel tank capacity Sp rk plug 9 B 9 9 bb b o ee amp 8 FRAME Dimensions Length x Width x Height Dry weight o S e 9 9 9 9 9 9 9 9 9 5 Grass bag capacity Cutting width 9
15. re to do so could result in personal injury or equipment damage CONTENTS sz cena eset epa saga eee eh Oe dat eee 3 C ar 4 O as 5 7 OPERATION 9 18 21 TROUBLESHOOTING 33 GENERAL SAFETY WARNING Know how fo stop the engine guickly and under stand operation of all the controls Never permit anyone to operate the mower without proper in Struction The rear shield is for your protection keep it in place at all times The blade is sharp and dangerous Never put your hands or feet under the mower Never tilt the mower to expose the blade while the engine is run ning If you find it necessary to work on the blade or mower Stop the engine and remove the spark plug cap Never stand in front of self propelled mowers when the engine is running Someone may accid entally engage the drive clutch Keep clear of the discharge opening when the bag is not attached to avoid being hit by a flying ob ject Clear the lawn of sticks stones or debris before mowing Mow only in cleared areas in daylight or good artificial light Protect yourself by wearing long trousers and ap propriate shoes Don t wear loose fitting clothing or sandals when mowing Keep children and pets away from the mower at all times If the blade strikes a stone sprinkler h
16. tch engages and releases properly 7 12 mm 9 32 15 32 in ADJUSTER y gt d t DRIVE CLUTCH LEVER LOCK NUTS following adjustments should be performed by an authorized Honda dealer unless the owner has the proper tools and is mechanically proficient 1 Move the throttle lever to IDLE and start the engine 2 Turn the throttle stop screw either in or out as required until the engine runs at 1 400 rpm 30 GRASS BAG ASSEMBLY GRASS BAG ANTI SAG NS UPPER FRAME 1 Insert the upper frame into the grass bag with 2 Place the anti sag rod in the bag as shown and its cutout facing forward secure its upper sides to the upper frame with two nuts BOLT amp WASHER LOWER FRAME 3 Turn the bag upside down Install the lower 4 Insert the lower plate into the bag and secure frame with the lipped edge forward and secure it to the lower frame with three bolts and it with two screws as shown washers 31 GRASS BAG HANDLE 4 5 Install the grass bag handle onto the upper frame with two cap nuts as shown CAP NUT 9 32 GRASS GRIP PIVOT HOLE 6 Install the grass bag grip by putting its ends the pivot hole on the rear end of the anti sag rod TROUBLESHOOTING CHART Engine will not start 1 No fuel 2 Throttle lever in STOP position 3 Spark plug wire loose or disconnected 4 Spark plug faulty o
17. uel valve ON THROTTLE LEVER 3 Place your foot on the STEP of the mower hous Ing 4 Pull the starter rope lightly until you feel compres sion then pull briskly NOTE Do not allow the rope to snap back return it by hand 5 After the engine warms up move the throttle lever to Squeeze the ROTO STOP to start the blade SDA and SDAW TYPES Engage the drive clutch ROTO STOP Mower will move forward NOTE The throttle lever may be moved anywhere between and LO to adjust engine speed during opera tion However the engine may stall if the lever is at IDLE when the ROTO STOP is engaged 14 STARTER Flooded Engine If the engine won t start after several pulls on the starter rope the engine is probably flooded To clear a flooded engine 1 Move the throttle lever to STOP and turn off the fuel valve 2 Remove and dry the spark plug When re installing the plug thread it in by hand until it seats Then tighten it an additional 1 8 1 4 turn with the spark plug wrench to compress the washer 3 Move the throttle to HI turn on the fuel valve and repeat steps 3 5 under Starting the Engine Stopping the Engine 1 Release the roto stop lever SDA and SDAW TYPES Release the drive clutch lever 2 Move the throttle lever to STOP and turn off the fuel valve Cutting Height Adjustment Six settings are available 5 8 1
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