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EMISSION-RELATED PARTS, 

FOR TWO (2) YEARS FROM THE DATE OF ORIGINAL DELIVERY OF THE UNIT, 

KOMATSU ZENOAH AMERICA INC. (THE COMPANY), 
THROUGH ANY RedMax DEALER, WILL REPAIR OR REPLACE, FREE OF CHARGE, FOR THE ORIGINAL AND EACH 
SUBSEQUENT PURCHASER, ANY PART OR PARTS FOUND TO BE DEFECTIVE IN MATERIAL AND/OR 
WORKMANSHIP. EMISSION-RELATED PARTS ARE:

THE CARBURETOR ASSY, COIL ASSY, ROTOR, SPARKPLUG, 

AIR FILTER, FUEL FILTER, INTAKE MANIFOLD, AND THE GASKETS

ALL OTHER PARTS EXCEPT ABOVE PARTS, 

FOR NINETY (90) DAYS FOR COMMERCIAL USE [THIRTY (30) DAYS FOR

RENTAL USE] FROM THE DATE OF ORIGINAL PURCHASE, THE COMPANY, THROUGH ANY RedMax DEALER, WILL
REPAIR OR REPLACE, FREE OF CHARGE, FOR THE ORIGINAL PURCHASER, ANY PART OF PARTS FOUND TO BE
DEFECTIVE IN MATERIAL AND/OR WORKMANSHIP. 

THIS IS THE EXCLUSIVE REMEDY.

THE PURCHASER SHALL BEAR COSTS OF TRANSPORTING THE UNIT TO AND FROM THE RedMax DEALER.

THE PURCHASER SHALL NOT BE CHARGED FOR DIAGNOSTIC LABOR WHICH LEADS TO THE DETERMINATION 
THAT A WARRANTED PART IS DEFECTIVE, IF THE DIAGNOSTIC WORK IS PERFORMED AT THE RedMax DEALER.

THE PURCHASER  OR OWNER IS RESPONSIBLE FOR THE PERFORMANCE OF THE REQUIRED MAINTENANCE AS 
DEFINED BY THE MANUFACTURER IN THE OWNER/OPERATOR MANUAL.

ANY WARRANTED PART WHICH IS NOT SCHEDULED FOR REPLACEMENT AS REQUIRED MAINTENANCE, OR 
WHICH IS SCHEDULED ONLY FOR REGULAR INSPECTION TO THE EFFECT OF "REPAIR OR REPLACE AS 
NECESSARY" SHALL BE WARRANTED FOR THE WARRANTY PERIOD.ANY WARRANTED PART WHICH IS 
SCHEDULED FOR REPLACEMENT AS REQUIRED MAINTENANCE SHALL BE WARRANTED FOR THE PERIOD OF 
TIME UP TO THE FIRST SCHEDULED REPLACEMNET POINT FOR THE PART.

ANY REPLACEMENT PART THAT IS EQUIVALENT IN PERFORMANCE AND DULABILITY MAY BE USED IN NON-
WARRANTY MAINTENANCE OR REPAIRS, AND SHALL NOT REDUCE THE WARRANTY OBLIGATION OF THE 
COMPANY.

THE COMPANY IS LIABLE FOR DAMAGES TO OTHER ENGINE COMPONENTS CAUSED BY THE FAIRURE OF A 
WARRANTED PARTS STILL UNDER WARRANTY.

THE WARRANTY DOES NOT APPLY TO

THOSE UNITS WHICH HAVE BEEN DAMAGED BY NEGLIGENCE OF 

INSTRUCTION LISTED IN THE OWNER/OPERATOR MANUAL FOR PROPER USE AND MAINTENANCE OF THE UNITS, 
ACCIDENT MISHANDLING, ALTERATION, ABUSE, IMPROPER LUBULICATION, USE OF ANY PARTS OR ACCESSARIES 
OTHER THAN THOSE SPECIFIED BY THE COMPANY, OR OTHER CAUSES BEYOND THE CONPANY'S CONTROL. 

THIS WARRANTY DOES NOT COVER

THOSE PARTS REPLACED BY NORMAL WEAR OR HARMLESS CHANGES IN 

THEIR APPEARANCE.

THERE ARE NO OTHER EXPRESS WARRANTIES.

IMPLIED WARRANTIES

INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 

ARE LIMITED

TO NINETY (90) DAYS FOR COMMERCIAL USE [THIRTY (30) DAYS FOR RENTAL USE] FROM THE

ORIGINAL DELIVERY DATE.

LIABILITIES FOR INCIDENTAL OR CONSEQUENTIAL DAMAGE UNDER ANY AND ALL WARRANTIES
ARE EXCLUDED.

SOME STATES DO NOT ALLOW LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS OR EXCLUSION OR 
LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMINATION OR EXCLUSION MAY 
NOT APPLY TO YOU.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY 
FROM STATE TO STATE.
IF YOU NEED TO OBTAIN INFORMATION ABOUT THE NEAREST SERVICE CENTER, PLEASE CALL KOMATSU 
ZENOAH AMERICA INC. AT (770)-381-5147.

IMPORTANT: 

YOU WILL RECEIVE A WARRANTY REGISTRATION CARD AT TIME OF PURCHASE.PLEASE FILL

OUT THE CARD AND SEND IT TO RedMax / KOMATSU ZENOA AMERICA WITHIN SEVEN (7) DAYS.BE SURE TO KEEP
A COPY FOR YOUR RECORDS.

RedMax 

LIMITED WARRANTY

KOMATSU ZENOAH AMERICA INC. 

4344 Shackleford Road Suite 500 

Norcross, Georgia 30093 

Summary of Contents for HC510DV

Page 1: ...tate of California to cause cancer birth defects or other reproductive harm WARNING Before using our products please read this manual carefully to understand the proper use of your unit WARNING Diamond wheel use only Do not use abrasive wheels with this product WARNING APPLICABLE SERIAL NUMBERS 200101 and up Dust Collection Type ...

Page 2: ......

Page 3: ...s which must be followed in order to prevent accidents which could lead to serious bodily injury or death This mark indicates instructions which must be followed or it leads to mechanical failure breakdown or damage This mark indicates hints or directions useful in the use of the product NOTE IMPORTANT WARNING CONTENTS 1 Parts location 4 2 Specifications 4 3 Warning labels on the machine 5 4 Symbo...

Page 4: ...Clutch Belt Pulley Gear Blade Rotating Direction Clockwise From Clutch Side View Reduction Ratio 4 1 Max Spindle Speed 3100 1 min rpm Vibration Isolation Mechanism 8 Point Support Vibration Free Handle System Dust Collection Mechanism Turbo Fan Drive Forced Dust Collection System Applicable Cutter Blade Type Dry type diamond blade Size 12 in 305mm 14 in 355mm Maximum Cut in Depth by 14 in Blade 13...

Page 5: ...from which you purchased the product to order new labels and affix them in the required location s Never modify your machine We won t warrant the machine if you use the remodeled machine or you don t observe the proper usage written in the manual WARNING IMPORTANT 3 Warning labels on the machine 5 ...

Page 6: ... machine Made in Japan RedMax IMPORTANT ENGINE INFORMATION THIS ENGINE CONFORMS TO U S EPA PH1 FOR SMALL OFF ROAD ENGINES ENGINE FAMILY 3KZXS 0494LM EM ENGINE DISPLACEMENT 49 3cm3 REFER TO OWNER S MANUMAL FOR MAINTE NANCE SPECIFICATIONS AND ADJUSTMENTS MANUFACTURED INFORMATION IMPORTANTE CONCERNANT LE MOTEUR Ce moteur conformc aux normcs U S EPA PH1 pour les petits moteurs tout terrain Type de mot...

Page 7: ...bon monoxide f Never use this unit under circumstances like those described below 1 When the ground is slippery or when other conditions exist which might make it not possible to maintain a steady posture 2 At night at times of heavy fog or at any other times when you re your field of vision might be limited and it would be difficult to gain a clear view of the area 3 During rain storms during lig...

Page 8: ...and sturdy long sleeved shirt 2 Helmet 3 Anti dust goggles 4 Anti dust musk 5 Vibration proof non slip gloves 6 Steel toed safety boots 7 Ear protectors b And you should carry with you things as follows 1 Attached tools 2 Properly reserved fuel 3 Spare wheel 4 Things to notify your working area Rope warning signs Never cut any material containing asbestos without using a respirator specifically ap...

Page 9: ...his product b Treat the wheel with special care Never roll drop or bump the wheel c Use proper wheel for the cutting material Improper wheels may shatter or break exposing the operator to serious injury or death d Check the wheel for broken loose or damaged parts before attaching it to the engine unit Repair or replace before using e When replacing the blade run the engine without load in low spee...

Page 10: ...ngine j Be sure the wheel does not turn while the engine is idling Adjust the carburetor if necessary OPERATION SAFETY PRECAUTIONS a Grip the handles firmly with both hands Place your feet slightly apart so that your weight is distributed evenly across both legs and always be sure to maintain a steady even posture while working b Keep all parts of your body away from rotating wheel c Never raise t...

Page 11: ...tions described in this manual at regular intervals b In the event that any parts must be replaced or any maintenance or repair work not described in this manual must be performed please contact a representative from the store nearest RedMax authorized servicing dealer for assistance c Under no circumstances should you ever take apart the product or alter it in any way d When replacing any parts o...

Page 12: ... fitting blades In case the dust stopper is unchanged dust collection performances become poor 1 14 inch version dust stopper 2 Screw 3 Mounting bracket a Remove 14 inch version dust stopper b Fix 12 inch version dust stopper 1 Remove a dust stopper fixed left inside of the blade cover 2 Remove a stopper element from a dust stopper mounting bracket Properly fix an attached 12 inch version stopper ...

Page 13: ...ulley cover as shown in the left Fig Slowly turn the blade to find a hole on a belt pulley and apply locking of the pulley 4 Securely tighten the flange bolt with an attached eye wrench of 17mm diagonal size Specified torque 266 434 in lbs 30 50 N m 1 Pulley cover 2 Cutter blade 3 Bar 4 Flange bolt 5 Eye wrench 6 Tighten These attached tools must be used also to remove the cutter blade FITTING DUS...

Page 14: ...the engine HOW TO MIX FUEL Pay attention to agitation 1 Measure out the quantities of gasoline and oil to be mixed 2 Put some of the gasoline into a clean approved fuel container 3 Pour in all of the oil and agitate well 4 Pour In the rest of gasoline and agitate IMPORTANT Gasoline is very flammable Avoid smoking or bringing any flame or sparks near fuel Make sure to stop the engine and allow it c...

Page 15: ...OR YOUR ENGINE LIFE AVOID 1 FUEL WITH NO OIL RAW GASOLINE It will cause severe damage to the internal engine parts very quickly 2 GASOHOL It can cause deterioration of rubber and or plastic parts and disruption of engine lubrication 3 OIL FOR 4 CYCLE ENGINE USE It can cause spark plug fouling exhaust port blocking or piston ring sticking 4 Mixed fuels which have been left unused for a period of on...

Page 16: ...fully retarded In case the blade continues to turn stop the operation and adjust or maintain to the proper operation To avoid accidents do not lock the throttle lever during operation Be sure to hold the handle by both hands during operation Left hand shall always hold a front handle with the thumb downward Continuous high speed idling will apply extra load to the engine Release the throttle lever...

Page 17: ...ble ground and confirm that there is no obstacle around the cutter blade As in the left Fig securely hold the machine with left hand and right foot and pull the starter knob Pull the knob lightly in the beginning and then hard when it becomes heavy OP5 Do not fully pull out the rope at once or let the knob go for free return as those may cause failure of the starter 7 When initial combustion noise...

Page 18: ...engine Even after stopping the engine the cutter blade continues to turn awhile by inertia Do not touch the blade until it is fully stopped Do not touch a muffler or the spark plug by bare hands immediately after stopping the engine There is a danger of burn for its high temperature 1 Return the throttle lever and operate for a while at low speed 2 OFF the power switch 1 ON 2 OFF 3 Switch Stopping...

Page 19: ...e blade cover can slide For cutting operation press the front guide tip onto a work Dusts are sucked from the front guide tip and collected in a dust bag after passing through inside of the blade cover a dust collection fan and the dust hose The dust collection performance is dependable to cutting direction Before stating the operation refer OP8 and decide a cutting direction so that dusts are eff...

Page 20: ... the main filter by tapping the edge of the filter on a hard plane for example The main and felt filters are of dry type Do not wet with water nor apply oils Those will degrade the performance Do not apply high pressure air blows or a wire brush to clean the main filter These will quicken clogging or damaging of the filter 6 Dusts adhered on the felt filter are removed by gently needing it For hea...

Page 21: ...e gap between the electrodes is 0 6 0 7mm Use specified spark plug for exchange Specified Spark Plug NGK BPM8Y Electrodes of the spark plug are contaminated by over sucking of fuel or by poor quality oil This may cause the engine start difficult FUEL FILTER About every 25 hours of operation remove a fuel filter from the fuel tank and remove adhered debris In case the filter is clogged exchange wit...

Page 22: ...ine may overheat and cause troubles Check and remove debris from time to time MA4 1 Air Inlet 2 Cylinder fin When the spark plug or air filter is removed for cleaning cover the fixing hole or the air inlet with cloth to avoid dusts The covers shall be reassembled correctly as original Failure in assembling may result in irregular wear or damage of components by machine vibrations BLADE DRIVE BELT ...

Page 23: ...3 By up and down the cutting head several times belt tension is regulated automatically by a spring force 4 Tighten those slacken bolt and nuts as original BELT EXCHANGE As the belt wears out correct tension cannot be maintained just by its adjustment In such a case ask your sales dealer to exchange or purchase new belt and exchange in following procedure The belt for exchange shall be a genuine p...

Page 24: ...ing the drive case on the main body MA12 1 Drive case 2 Drive belt 3 Pulley 4 Belt cover 8 As removing the drive case and cutting head together from the main body remove the belt out from a pulley on the main body 9 Slacken 3 nuts which are fixing the cutting head then separate the drive case and the cutting head Remove the belt At this time a belt tensioner spring and a boss built into the cuttin...

Page 25: ...it with a finger from backside of the drive case FAN DRIVE BELT BELT TENSION ADJUSTMENT AND EXCHANGE The belt is normal if it sags about 5mm by pushing the belt outward with a finger Apply following procedures if readjustment is required 1 Slacken 5 screws on the belt cover and remove the belt cover 2 Slacken centre bolt of an idler pulley 3 Apply plug wrench to a hex nut on belt adjustment plate ...

Page 26: ...buretor on your unit has been factory adjusted but may require fine tuning due to change in operating conditions Before adjusting the carburetor make sure that provided are clean air fuel filters and fresh properly mixed fuel When adjusting take the following steps Be sure to adjust the carburetor with the cutter blade attached 1 H and L needles are restricted within the number of turn as shown be...

Page 27: ...4 Make a test cut adjust the H needle for best cutting power not for maximum speed Standard Idle Speed 2300 2700 rpm 1 Idle adjust screw T 2 Low speed needle L 3 High speed needle H 9 Maintenance 27 ...

Page 28: ...e rope ask sales dealer or obtain RedMax genuine part and go through following procedure 1 Remove a recoil case from the machine MA16 1 Recoil case 2 Pull out the starter rope and make a temporary knot in the middle Pull out the rope from the starter knob and unknot its end knot MA17 1 Starter rope 2 Temporary knot 3 Starter knob 4 Washer 3 Unknot the temporary knot and slowly retract the rope 4 A...

Page 29: ...ading the rope through a guide of recoil case align a notch in the back of reel with end of the coil spring Assemble a spacer and the reel to the recoil boss By turning the reel left and right engage the reel notch with the spring end 8 Put a washer on the recoil boss and fix the screw as original 9 Lead the rope through a guide hole on the starter case starter knob and a washer and make a knot do...

Page 30: ... the reel with left hand hitch the rope to the reel notch and turn additional 2 3 turns clockwise Excessive turns of reel cause overload on the coil spring and may break it in short time As a guideline retraction of the recoil spring is that the reel can be turned 1 2 turns further with the rope completely drawn out 13 Reassemble the recoil case to the main body as original IMPORTANT ...

Page 31: ...ener and remove internal dusts completely 3 Remove debris and dirt on the machine body 4 After discharging fuel from the fuel tank start the engine and run until it stops 5 Remove the spark plug and drop 1 2 cc of 2 cycle engine oil into the plug hole then pull the starter rope for 2 3 times After fitting the spark plug as original pull the starter rope and stop at compression position 6 Fully sla...

Page 32: ...rect GAP 0 6 0 7mm spark plug disconnected retighten Case 2 Engine starts but does not keep running Hard re starting CHECK PROBABLE CAUSES ACTION fuel tank incorrect fuel or staled fuel drain it and with correct fuel carburetor adjustment screw out of normal range adjust to normal range muffler cylinder exhaust port carbon is built up wipe away air cleaner clogged with dust wash cylinder fin fan c...

Page 33: ...e specified in the parts list then use parts number described in the parts list 4 The contents described in the parts list may change due to improvement 5 The parts for the machine shall be supplied seven 7 years after the machine is discontinued It is possible that some specific parts may be subject to change of their delivery term and list price within the limit of seven 7 years after the machin...

Page 34: ...12 Parts list Fig 1 CUTTER UNIT HC510DV S N 200101 and up 34 ...

Page 35: ...SKET 1 69 2850 14220 BOLT M5x20 4 70 2884 62430 SCREW M5x25 4 71 2884 62450 O RING 1 72 07005 00812 WASHER 1 Key Part Number Description Q ty 73 01010 80810 BOLT M8x10 1 74 2884 62500 SHAFT COMP 1 75 2884 62600 GEAR COMP 1 76 2884 62710 BEARING 1 77 2884 62720 WASHER 2 78 2884 62800 SHAFT COMP 1 79 2885 63110 PULLEY 1 80 2884 63120 SPACER 1 81 0290 20820 WASHER 1 82 3350 43231 NUT 1 83 2884 65710 ...

Page 36: ...Fig 2 POWER UNIT 1 HC510DV S N 200101 and up 36 12 Parts list ...

Page 37: ... 118 2850 34501 BREATER 1 119 3356 34310 PIPE 1 120 2670 82421 GROMMET 1 Key Part Number Description Q ty 1 2884 12110 CYLINDER 1 2 2884 14100 VALVE ASS Y 1 3 3388 23110 GROMMET 1 4 2880 14111 PIPE 1 5 2880 14120 SPRING 1 6 2880 14150 GUIDE 1 7 2670 14311 BRACKET 1 8 2670 14320 SCREW M5x14 2 9 2880 14350 SPACER 1 10 2880 14361 GASKET 1 11 2670 14211 GASKET cylinder 1 12 2850 14220 BOLT M5x20 4 13 ...

Page 38: ...12 Parts list Fig 3 POWER UNIT 2 HC510DV S N 200101 and up 38 ...

Page 39: ... 2810 33102 HANDLE COMP 1 63 3330 33250 STOPPER 1 64 3310 33262 SPRING 1 65 3310 33271 KNOB 1 66 2810 33280 DAMPER 1 67 2670 75520 SCREW TP4x16 1 68 2810 33211 GASKET 1 69 2670 33311 LEVER 1 70 3356 33321 SPRING 1 71 04025 00524 SPRING PIN 1 72 3356 33352 ARM 1 73 2670 34110 COVER 1 74 2671 32210 SCREW TP5x19 1 75 2880 35111 DAMPER 4 76 2670 35120 SCREW TP5x16 4 77 2810 35150 CAP 4 78 2880 35211 D...

Page 40: ... 81280 COVER 1 11 3356 81310 INLET VALVE 1 12 3356 81340 THROTTLE VALVE 1 13 2670 81410 SPRING 1 14 T2108 81370 THROTTLE SHAFT 1 15 2630 81460 SPRING 1 16 2670 81430 SCREW 1 17 2880 81470 SCREW 3 18 3310 81351 SCREW 4 19 2880 81460 CHOKE SHAFT 1 20 1148 81390 RING 1 21 3350 81350 SPRING 1 22 3350 81220 BALL 1 Key Part Number Description Q ty 23 2670 81450 CHOKE VALVE 1 24 2810 81440 LEVER 1 12 Par...

Page 41: ...1 00810 SPANNER 8x10 1 14 09007 00528 WRENCH 5 1 15 09007 00632 WRENCH 6 1 16 2670 96310 WRENCH T25 1 17 2670 96320 WRENCH T20 1 31 2894 96000 SPACIAL TOOL SET OP 1 32 2890 96100 PULLER ASS Y OP 1 33 2616 96210 WRENCH OP 1 34 2670 96220 STOPPER OP 1 Key Part Number Description Q ty 35 3350 96230 GUIDE OP 1 36 3350 96620 GUIDE OP 1 37 2670 96660 HOLDER OP 1 38 3350 96240 GAUGE OP 1 39 2670 96410 WR...

Page 42: ...nsibilities As the small off road engine owner you are responsible for the performance of the required maintenance listed in your owner s manual KOMATSU ZENOAH recommends that you retain all receipts covering maintenance on your small off road engine but KOMATSU ZENOAH can not deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance A...

Page 43: ... IS EQUIVALENT IN PERFORMANCE AND DULABILITY MAY BE USED IN NON WARRANTY MAINTENANCE OR REPAIRS AND SHALL NOT REDUCE THE WARRANTY OBLIGATION OF THE COMPANY THE COMPANY IS LIABLE FOR DAMAGES TO OTHER ENGINE COMPONENTS CAUSED BY THE FAIRURE OF A WARRANTED PARTS STILL UNDER WARRANTY THE WARRANTY DOES NOT APPLY TO THOSE UNITS WHICH HAVE BEEN DAMAGED BY NEGLIGENCE OF INSTRUCTION LISTED IN THE OWNER OPE...

Page 44: ...eut être utilisée pour l entretien hors garantie ou les réparations hors garantie et ce sans réduire l obligation de garantie incombant à la société La société sera tenue responsable des dommages aux autres composants du moteur causés par la défaillance de pièce s garantie s en période de garantie La garantie ne s applique pas aux unités endommagées par suite de négligence dans la mise en oeuvre d...

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