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SERVICE MANUALELECTRICAL TROUBLESHOOTINGVOLUME 2ALL MODELSSERIAL NUMBERS 470000 THRU 6299999THE GRASSHOPPER COMPANYMoundridge, Kansas 67107 U.S.A.(620) 345-8621GRASSHOPPERMOWER.COMPrice 12.00Form 172111-160216Printed in U.S.A.
INTRODUCTIONConsult the operator's manual wiring diagramfor the specific year and model of the machine you are working on for troubleshooting.For further assistance, contact The Grasshopper Company, service department at(620)345-8621.This manual has been developed to diagnosecomponent failures only. It will not indicatea problem in the wiring or terminals. For example, if the troubleshooting guide indicatesthat the left steering switch is defective andreplacing the left steering switch does notsolve the problem; then you may have badterminals or wiring to that switch.Copyright 2017, 2016, 2014, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2002, 2001, 1999, 1998, and 1997 by The GrasshopperCompany. The following material is proprietary information. All rights reserved. Reproduction or dissemination in any form by any means isprohibited, except by express written permission from The Grasshopper Company.2Rev. 11-01
TABLE OF CONTENTSPAGE2INTRODUCTIONSWITCH FUNCTIONS5-6TROUBLESHOOTING CONTROL RELAYSAll Kubota Gasoline Models .7All Kubota Diesel Models .7Control Relay - All Kubota Models .8Circuit Board Diode Problems - All Models .8FUSE BLOCK DIAGRAMS9TESTING SAFETY SYSTEM FOR PROPER OPERATIONAll Briggs, Kawasaki & Kohler Models .10All Kubota Models .11BATTERY CHARGING SYSTEMAll Kawasaki Models . 12-13All Briggs & Kohler Models .14All Kubota Models with Green/Smooth Alternators . .15All Kubota Models with Aluminum/Finned Alternators .16ENGINE WILL NOT CRANK120, 124, 126, 226V, all 600 Series Models except 618 2003 & up; 718 Briggs . 18-19All Briggs Big Block Models, 120K, all 200 Series except 226V, 700 Series Kohler Models,618 2003 & Up & all Kawasaki models. . .20-21All Kubota Models . 22-23ENGINE WILL CRANK, BUT NOT STARTAll Briggs, Kawasaki & Kohler Models .24All Kubota Gasoline Models .25All Kubota Diesel Models except those with D902 Engines. .26Kubota Diesel Models with D902 Engines .27ENGINE STARTS, BUT DIESWHEN STEERING LEVERS ARE BROUGHT IN OR PTO SWITCH IS ENGAGEDAll Briggs, Kawasaki & Kohler Models .28All Kubota Models .29(continued)Rev. 01-113
TABLE OF CONTENTS(CONTINUED)PAGEENGINE STARTS, BUT DIESWHEN KEY SWITCH IS RELEASEDAll Kubota Diesel Models except those with D902 Engines. . 30-31Kubota Diesel Models with D902 Engines .32Briggs, Kawasaki & Kohler Models .33ENGINE STARTS AND RUNS, BUTWILL NOT SHUT OFFKubota Diesel Models with D902 Engines . 34-35TROUBLESHOOTING PTO CLUTCHAll Models except Kubota .36All Kubota Models .37Acceptable Clutch Resistance Range in Ohms .38TROUBLESHOOTING ELECTRIC LIFTElectric Lift Does Not Operate . 39-42Wiring Diagram .43HYDRAULIC LIFT DOES NOT WORKSeparate Tilt Switch/Delay Timer Style . 44-45One Piece Tilt Switch/Delay Timer Style . 46-474Rev. 10-08
SWITCH FUNCTIONSSLBGIgnition switch, part no. 183806.(All Briggs, Kawasaki & Kohler Models).M Magneto terminal.S Starter terminal.B Battery terminal.L Lights, accessory terminal.G Ground terminal.M1917Ignition switch, part no. 183827.(All Kubota Models).30 Battery terminal.50 Starter terminal.AC Accessory terminal.17 Glow plug terminal (Diesel only).19 Glow plug indicator terminal (Diesel only).50AC30Brake switch, part no. 183894.NC (normally closed) - means that the contact is closed and current will flow betweenthese two terminals. When the button isdepressed, these two terminals becomeopen.NC NORELEASEDNC NODEPRESSEDRev. 03-05NO (normally open) - means that the contact is open with the switch mechanismreleased. When the button is depressed,these two terminals become closed.The dotted line indicates an electrical connection between the two terminal posts.5
SWITCH FUNCTIONSLeft and right steering switch, part no.183860.NC (normally closed) - means that the contact is closed with the switch mechanismreleased. The contact position is reversedwhen the switch lever is depressed.NCCOM M ONNONO (normally open) - means that the contactis open with the switch mechanism released. The contact position is reversedwhen the switch lever is depressed.RELEASEDNCCOM M ONThe dotted line indicates an electrical connection between the two terminal posts.NODEPRESSEDOFFONPTO switch, part no. 183925.The dotted line indicates an electrical connection between the two terminal posts.Seat switch, part no. 183870.The dotted line indicates an electrical connection between the two terminal posts.RELEASEDDEPRESSED6
TROUBLESHOOTING CONTROL RELAYSALL KUBOTA GASOLINE MODELSALL KUBOTA DIESEL MODELS1. Control relay - inspection.A. Control relay A has 2 red wires, 1black wire, 1 yellow wire and 1 greenwire in the relay socket.B. Control relay B has 3 blue wires and1 green wire in the relay socket.1. Control relay - inspection.A. Control relay A has 2 red wires, 1 blackwire, 1 yellow wire and 1 green wire inthe relay socket.B. Control relay B has 3 blue wires and1 green wire in the relay socket.2. Assuming the main fuse, PTO fuse, ignition fuse are good, failure of control relayA or associated wiring will be evidencedby the following three symptoms:A. PTO clutch will not engage.B. Hourmeter will not run.C. Ignition coil will not have any voltageon the positive terminal*2. Assuming the main fuse, PTO fuse, ignitionfuse are good, failure of control relay A orassociated wiring will be evidenced by thefollowing three symptoms:A. PTO clutch will not engage.B. Hourmeter will not run.C. Fuel solenoid will pull in but not hold.3. Assuming the start fuse is good, failureof control relay B or associated wiring willresult in starter solenoid not engaging;thus the starter motor will not operate.3. Assuming the start fuse is good, failure ofcontrol relay B or associated wiring will result in starter solenoid not engaging; thusthe starter motor will not operate.* (On 432 and 932, the plug which leads toigniter assembly will not have any voltage).T o m a infu s eT o p a dA o f P Cb o a rdT o p a dG o f P Cb o a rdR e d w /W h iteY e llo ww /B ro w nT h1 .2 .3 .isDoow irr iv er P Tr b oe gr oOtho e s ton s e a to ff, b oo f th eg roa n dth sa b o 1 2 v ow ith k es w itc h'R U N 'p o s itiou n d w h e n :p a r k in g b r a k e r e le a s e d ,te e r in g le v e r s o u t,v e .T o s ta rtfu s e 1 2 v o lts w ith k e ys w i t c h i n 'S T A R T 'p o s itio nnB lu eBAG re e nB lu eltsyinT h is w ir e g o e s tog r o u n d w ith s te e r in gle v e r s o u t a n d P T O o ffT o s ta rtfu s e 1 2 v o lts w h e n r e la y'B ' i s e n e r g i z e d 1 2 v o lts w h e n r e la y'A ' i s e n e r g i z e dT o Pfu s eig n itfu sMT O&io neT o p a do f P Cb o a rdRev. 12-02R e dB lu eG r e e n w /Y e llo wB la c kFigure 17S ta rte rs o le n o idRT o p a do f P Cb o a rd
CONTROL RELAY - ALL KUBOTAMODELSCIRCUIT BOARD DIODEPROBLEMS - ALL MODELSAssuming a normal diode on the circuit ,board, relay B is affected by a problem in thecircuit containing the PTO switch, and leftand right steering switches.Refer to the illustration below (figure 2) to locate the diode on the circuit board betweenpad R and A.Open DiodeAssuming a normal diode on the circuit board,relay A is affected by a problem in the circuitcontaining the PTO switch, and left and rightsteering switches. It is also affected by aproblem in the circuit containing the parkingbrake switch and seat switch.An open diode will result in the followingsymptoms:Assuming steering levers out and PTOswitch off, engine can be cranked andstarted only with driver on the seat andthe parking brake in the 'OFF' position.If driver gets off of the seat or puts parkingbrake to the 'ON' position, the engine willdie.Shorted DiodeAssuming an operator on the seat andparking brake is 'OFF', engine can becranked and started with PTO switch inthe 'ON' position or steering levers in.Circuit Board with DiodeRAFigure 28Rev. 12-02
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TESTING SAFETY SYSTEM FOR PROPER OPERATIONALL BRIGGS MODELSALL KAWASAKI MODELSALL KOHLER MODELSSteering levers out,PTO switch 'OFF'. Ifengine starts, all ofthe above switchesare functioning intheir closed position.Notes: Proper operation of the safety systemindicates that:1. To start the engine, both steering leversmust be out, and the PTO switch must beoff.2. With the engine running and the operator off the seat, the engine will die if eithersteering lever is brought in or the PTOswitch is turned on.3. The engine will also die if the operator getsoff the seat with either steering lever in orthe PTO switch turned on.4. The engine will die if the steering levers arebrought in with the parking brake on.Turn engine 'OFF'.Does engine crank YesAdjust or replace leftwith only left steeringsteering switch.lever 'IN'?NoDoes engine crank Yeswith only rightsteering lever 'IN'?NoDoes engine crank Yeswith only the PTOswitch turned 'ON'?Adjust or replaceright steering switch.Replace PTO switch.NoSteering levers out,Steering levers out,PTO switch 'OFF', Yes PTO switch 'OFF', Yesoperator OFF seat,operator ON seat,parking brake 'OFF'parking brake 'ON'and engine running.and engine running.Does engine dieDoes engine diewhen one or bothwhen one or bothsteering levers aresteering levers arebrought 'IN'?brought 'IN'?NoReplace relay A.All safety systemsare functioningproperly.NoReplace brakeswitch.10Rev. 03-05
TESTING SAFETY SYSTEM FOR PROPER OPERATIONALL KUBOTA MODELSNotes: Proper operation of the safety systemindicates that:1. To start the engine, both steering leversmust be out, and the PTO switch must beoff. The engine will start with the operatoron or off the seat and the parking brakeeither on or off.2. With the engine running and the operator off the seat, the engine will die if eithersteering lever is brought in or the PTOswitch is turned on.3. The engine will also die if the operator getsoff the seat with either steering lever in orthe PTO switch turned on.4. The engine will die if the steering levers arebrought in with the parking brake on.Steering levers out,PTO switch 'OFF',parking brake 'OFF',operator OFF seatand engine running.Does engine die Yes Does engine dieDoes engine dieYesYeswhen right steeringwhen left steeringwhen the PTO switchlever is brought 'IN'?lever is brought 'IN'?is turned 'ON'?NoAdjust or replace leftsteering switch.ANoNoAdjust or replaceright steering switch.Replace PTO switch.Steering levers out,PTO switch 'OFF',parking brake 'ON',operator ON seatand engine running.Does engine die Yes Steering levers in,when steering leversPTO switch 'OFF',are brought 'IN'?parking brake 'OFF',operator ON seatNoand engine running.Replace brakeswitch.Does engine die Yeswhen operator raisesup off the seat?NoReplace seatswitch.Rev. 12-02To A11All safety systemsare functioningproperly.
BATTERY CHARGING SYSTEMALL KAWASAKI MODELSEngine is notrunning.Notes:1. Voltage tests are performed with a DC/ACvoltmeter.2. Tests are performed after regulator fuse ischecked.3. AC voltage tests are performed with engineat 3600 rpm.Attach DC voltmeter tonegative and positiveposts of battery.Does voltmeter read Yes12.2 DC volts or above?Battery is in goodcondition.NoTest and rechargebattery.Start engine andobserve batteryvoltage at fullthrottle.Is voltage at battery Yes Charging systemis functioningbetween 13 and 14.7properly.DC volts?NoKey switch is in'RUN' position.Voltage test isperformed witha voltmeter tobattery ground(negative post)unless otherwisenoted.NoDoes DC voltageappear at red wireat voltageregulator plugto ground?YesTO Acontinues onnext pageNoIf regulator fuse isgood, red wire onharness side of 6 wayengine plug shouldshow battery voltage.Check connectionsin 6 way plug.12Rev. 04-11
BATTERY CHARGING SYSTEM(CONTINUED)ALL KAWASAKI MODELScontinued fromprevious pageAKeyswitch is inDisconnect regulator"RUN" position.rectifier plug. Place ACDoes voltageYes voltmeter accross AC Yesappear atterminals in plug. DoesService Statorred/white triggervoltage read less thanwire at voltage28 volts AC at fullregulator tothrottle?ground?NoReplaceregulator - rectifierNoDoes voltageappear at redwire on triggerwire relayto ground?NoReplace 30 ampin-line fuse inred wirebetweenregulator rectifier andrelay.Rev. 02-16YesDoes voltageappear at blackwire at relayto ground?YesDoes groundappear at greenwire at relay tobattery positiveside?NoNoCheck groundconnection atengine.Replace Light/AuxFuse13Yes ReplaceRelay
BATTERY CHARGING SYSTEMALL BRIGGS MODELSALL KOHLER MODELSEngine is notrunning.Notes:1. Voltage tests are performed with a DC/ACvoltmeter.2. Tests are performed after regulator fuse ischecked.3. AC voltage tests are performed with engineat 3600 rpm.Attach DC voltmeter tonegative and positiveposts of battery.Does voltmeter read Yes12.2 DC volts or above?Battery is in goodcondition.NoTest and rechargebattery.Start engine andobserve batteryvoltage at fullthrottle.Is voltage at batterybetween 13 and 14.7DC volts?YesCharging system isfunctioning properly.NoDisconnectregulator-rectifierplug. Place ACvoltmeter across ACterminals in plug andread voltage.Does voltage readless than 28 volts ACwith engine running?YesService stator.NoIf AC voltagemeasures more than28 volts replaceregulator-rectifier.For more detailedtesting consult theengine repairmanual.14Rev. 04-11
BATTERY CHARGING SYSTEMALL KUBOTA MODELS WITH SMOOTH ALTERNATORSEngine is notrunning.Notes:1. Voltage tests are performed with a DC/ACvoltmeter.2. Tests are performed after regulator fuse ischecked.3. AC voltage tests are performed with engineat full RPM.Attach DC voltmeter tonegative and positiveposts of battery.Does voltmeter read Yes12.2 DC volts or above?Battery is in goodcondition.NoTest and rechargebattery.Start engine andobserve batteryvoltage at fullthrottle.Is voltage at batterybetween 13 and 14.7DC volts?YesCharging system isfunctioning properly.NoDoes AC voltageappear between the2 blue wires fromalternator?A. 10 volts* at idle?B. 36 volts* AC at fullthrottle?NoYesDoes green wire onthe regulator plugDoes DC voltageYesYesbetween the two blueappear on white wirewires show groundto voltage regulatorwhen tested toplug to ground?battery positive?NoNoReplace alternator.Check groundconnection.Is voltage at red wireNoReplace voltageof voltage regulatorregulator.13-14.7 DC volts to ground?Does voltage appearYes Check white wire andon terminal AC ofterminals fromignition switch to ground?terminal AC ofignition switch toNovoltage regulator.Check ignition switchfor continuity fromterminal AC toterminal 30.YesCheck red wire, regulator fuse andterminals from terminal 30 ofignition switch to voltage regulator.*voltage may vary or - 3 volts.Rev. 07-1115
BATTERY CHARGING SYSTEMALL KUBOTA MODELS WITHALUMINUM/FINNED ALTERNATORSNotes:1. Tests are performed after regulator fuse ischecked.2. Set voltmeter to DC voltage for testing onthis page.Engine isnot running.Attach voltmeterto negative andpositive postsof battery.Does voltmeterread 12.2 voltsor above?YesBattery is ingood condition.NoTest and rechargebattery.Start engine andobserve batteryvoltage at fullthrottle.Is voltage atbattery between13 and 14.7 volts?YesYes Charging systemis functioningproperly.NoService alternator regulator assembly.16Rev. 09-10
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ENGINE WILL NOT CRANK120, 124 & 126 BRIGGS226V BRIGGSALL 600 SERIES MODELS (EXCEPT 6182003 & UP)718 BRIGGSTest battery forcondition andcharge.Steering levers out,PTO switch 'OFF'.Voltage tests areperformed with avoltmeter or test lightto battery ground.Notes:1. Voltage tests are performed with a DC voltmeter.Key switch is in'START' position foreach test.Does voltage appear Yes Does voltage appearfrom terminal 'C' offrom terminal 'D' ofstart fuse?start fuse?(See Figure 9 or 10)NoYesReplace start fuse.NoIf there is voltage atterminal 'D' of startfuse, there shouldalso be voltage onblue wire at startersolenoid.YesTo Acontinues onnext pageProblem is the keyswitch or the powerto the key switch.KEYSWITCHPTOSWITCH(In start position)BLUE(Steering levers out)BLUEYELLOWSTARTERSOLENOIDSTART FUSERED(PTO OFF)STEERING SWITCHESRIGHTLEFTSLBGRTSTRMYELLOWYELLOWLTSTRGREEN / YELLOW -Figure 818Rev. 01-11
ENGINE WILL NOT CRANK(CONTINUED)120, 124 & 126 BRIGGS226V BRIGGSALL 600 SERIES MODELS (EXCEPT 6182003 & UP)718 BRIGGSKey switch is in'OFF' position foreach test. You arenow testing a groundcircuit. All tests willbe to the batterypositive side.Acontinued fromprevious pageDoes the yellow wireat starter solenoidshow ground whentested?YesCheck startersolenoid. Problemcould be startersolenoid or starter.NoDoes either yellowwire on PTO switchshow ground whentested?YesReplace PTO switch.NoDo either yellowwires on rightsteering switch showground when tested?Yes Right steering switchis defective or out ofadjustment.NoDo either yellowwires on left steeringswitch show groundwhen tested?Yes Left steering switch isdefective or out ofadjustment.NoCheck groundjunction with greenwires on engine.Fuse Block Test Points718 BriggsFuse Block Test Points120, 124, 126, 226V & 600 SeriesFuse block styles will vary.Be sure you are checking designated fuse.Figure 101930REGULATOR FUSE7.5BASTART FUSE10DCPTO FUSE7.5ACCESSORY SLOT7.5LIGHT FUSEFigure 9Rev. 02-16FELIGHT FUSEHG107.5FESTART FUSE30REGULATOR FUSEDCPTO FUSEB AH GACCESSORY SLOTFuse block styles will vary.Be sure you are checking designated fuse.
ENGINE WILL NOT CRANK329B, 335B, 729BT6 & 735BT6 BRIGGS BIGBLOCK MODELS120K KOHLERALL 200 SERIES MODELS EXCEPT 226VALL 700 SERIES KOHLER MODELS618 2003 & UPALL KAWASAKI MODELSTest battery forcondition andcharge.OKSteering levers out,PTO switch 'OFF'.Voltage test isperformed with avoltmeter or test lightto battery ground.Notes:1. Do not forget to plug starter relay back inwhen finished testing.Key switch is in'START' position foreach test.YesDoes voltageappear fromterminal 'C' ofstart fuse?Yes Does voltageappear onterminal 85 ofstarter relay?Does voltageappear fromterminal 'D' ofstart fuse?NoNoCheck wiresfrom startfuse tostarter relay.KEYSWITCHPTOSWITCH(in start position)BLUE(PTO OFF)START FUSEDoes voltageappear onterminal 87(inline fusewire) ofstarter relay?YesTo Acontinues onnext pageNoNoReplacestart fuse.Problem is the keyswitch or the powerto the key switch.YesCheck 30 ampin-line fusein wire betweenstarter relay andstarter solenoid.STEERING SWITCHESRIGHTLEFT(Steering levers out)BLUEREDREDSLINLINEFUSEHOLDER8786 87a YELLOWLTSTRGREEN / YELLOWFigure 1120Rev. 02-16
ENGINE WILL NOT CRANK(CONTINUED)Fuse Block Test PointsFuse block styles will vary.Be sure you are checking designated fuse.30REGULATOR FUSE7.57.5YesReplacePTO switch.7.5HGLIGHT FUSEFE10Replace thestarter relay.30YesDCPTO FUSEB A120KAll 200 Series Models618 2003 & upAll Briggs Big Block ModelsNoFigure 13Starter Relay TestingDoes either yellowYeswire on rightsteering switch showground when tested?Right steeringswitch isdefective orout ofadjustment.NoDoes either yellowwire on left steeringswitch show groundwhen tested?BAFuse block styles will vary.Be sure you are checking designated fuse.NoDoes either yellowwire on PTO switchshow ground whentested?DC700 Series Kohler ModelsAll Kawasaki ModelsREGULATOR FUSEDoes the yellow wirewithout the in-linefuse show groundwhen tested?LIGHT FUSERemove the starterrelay. It is located onthe inside of theframe, on the leftside of the engineon Kohler modelsand on the rightside of theKawasaki models.FESTART FUSEH G10Key switch is in'OFF' position foreach test. You arenow testing a groundcircuit. All tests willbe to the batterypositive side.PTO FUSENo329B, 335B, 729BT6 & 735BT6 BRIGGSBIG BLOCK MODELS120K KOHLERALL 200 SERIES MODELS EXCEPT 226VALL 700 SERIES KOHLER MODELS618 2003 & UPALL KAWASAKI MODELS7.5continuedfrompreviouspageYes Check startersolenoid.Problem couldbe startersolenoid orstarter.START FUSEADoes voltage appearon terminal 30 ofstarter relay?YesLeft steeringswitch isdefective orout ofadjustment. If all safety switches are correct,terminal 86 is grounded. Terminal 87 is 12 volts. Terminal 85 is 12 volts whenkey switch is in 'START' position. Terminal 30 is 12 volts whenrelay is energized.Yellow WireTo pad T of circuit boardFuse holderTo battery30terminal of87starter87a86NoCheck groundat engine.8530Blue WireFuse clip toregulator fuseBlue WireTo pad S of circuit boardTo input terminal of starterFigure 14Rev. 02-1621
ENGINE WILL NOT CRANKALL KUBOTA MODELSTest battery forcondition andcharge.OKSteering levers out,PTO switch 'OFF'.Voltage test isperformed with avoltmeter or test lightto battery ground.Key switch is in'START' position foreach test.Does voltage appearfrom terminal 'I' ofstart fuse?Yes Does voltage appearfrom terminal 'J' ofstart fuse?NoYes Does voltage appearon blue wire atstarter solenoid?NoProblem is the keyswitch or the powerto the key switch.YesCheck startersolenoid. Problemcould be startersolenoid or starter.NoReplace start fuse.To Acontinues onnext pageK E YS W IT C HS T E E R IN GR IG H TP T OS W IT C H( In s ta r t p o s itio n )(P T OS W IT C H E SL E F T( S te e r in g le v e r s o u t)O F F )G R E E NB L U ER E D 1 9-B L U ES T A R TF U S E1 7Y E L L O WB L U EB L U E5 0S T A R T E RA C3 0R E L A Y BG R E E N/ Y E L L O WR TS T RL TS T RY E L L O WFigure 1522Rev. 02-16
ENGINE WILL NOT CRANK(CONTINUED)ALL KUBOTA MODELScontinued fromprevious pageANoKey switch is in'OFF' position foreach test. You arenow testing a groundcircuit. All tests willbe to the batterypositive side.Remove relay 'B'. Itis the relay with 3blue wires and 1yellow wire in theplug.Does the green/Yesyellow wire on theplug of relay 'B' showground when tested?Replace relay 'B'.NoDo both wires on leftDo both yellow wiressteering switch show Yeson right steeringground when tested?switch show groundwhen tested?NoBefore replacing thesteering switch,check adjustment. Ifit does not clickwhen steering leversare moved in and outadjust the switch.YesRelay BReplace PTO switch.8786 87a 85NoBefore replacing thesteering switch,check adjustment. Ifit does not clickwhen steering leversare moved in and outadjust the switch.30Figure 16Fuse Block Test PointsFuse block styles will vary.Be sure you are checking designated fuse.I JRev. 02-1623CD15MAIN FUSE30ACCESSORY SLOT10BAPTO FUSE7.5IGN/SOL FUSE30FEREGULATOR FUSEH GACCESSORY SLOTReplace rightsteering switch.START FUSEReplace left steeringswitch.Figure 17
ENGINE WILL CRANK, BUT NOT STARTALL BRIGGS MODELSALL KAWASAKI MODELSALL KOHLER MODELSNotes:1. Tests are performed after LIGHT/AUX fusehas been checked on all models, checkfuel pump fuse on Kawasaki Models.If engine cranks, butwill not run; thesafety switches arefunctioning properly.Test engine forspark. Does sparkoccur at spark plug?YesCheck for fuelsystem problem orengine failure.NoDisconnect yellowsafety wire* fromengine and retest.Does spark nowoccur at spark plug?NoReconnect yellowsafety wire. Thereis an engineignition relatedproblem. Consultengine repairmanual.YesReconnect yellow safety wire.Replace safety relay in console.Use part number 184271 relay forall 100, 200, 300 & 600 tractors.Use part number 184271 relay for700 series tractors with serial number6399999 & below.Use part number 184266 relay for700 series tractors with serialnumber 6400000 & above.* Briggs engine excluding Briggs Big Block: Single yellow wire on left side of engine.Kohler & Briggs Big Block engine:Disconnect plug on left side of engine.Using a small screwdriver, release thelock tab on yellow wire in tractor side plugand remove wire. Reconnect the plug.Kawasaki engine:Disconnect plug on right side of engine.Using a small screwdriver, release thelock tab on yellow wire in tractor side plugand remove wire. Reconnect the plug.Warning!With the yellow wire disconnected from the engine, all safetyfunctions and the key switch will be inoperable in their ability toshutoff the engine. This step is performed for test purposes only.Under no conditions should the PTO be turned ON or the machinebe driven with the yellow wire disconnected! Always reconnectthe yellow wire to the engine after this test.24Rev. 01-14
ENGINE WILL CRANK, BUT NOT STARTALL KUBOTA GASOLINE MODELSSteering levers out,PTO switch 'OFF'.Voltage tests areperformed with avoltmeter or test lightto battery ground(negative post).Notes:1. All tests are made with wires in place ontheir respective switches.2. Refer to fuse block diagram for terminallocations.3. Refer to “Troubleshooting Control Relays”for information on the diode and controlrelays.4. If engine will crank, control relay “B” isfunctioning properly. This means that thePTO switch, right steering switch and leftsteering switch are functioning properly.Key switch is in'RUN' position foreach test untilotherwise noted.YesProblem is in ignitioncoil or distributor.Consult Kubotaengine manual forrepair.Replace control relayA.NoFuse Block Test PointsFuse block styles will vary.Be sure you are checking designated fuse.FEReplace main fuse.I J15YesMAIN FUSEDoes voltage appearfrom terminal 30(battery) of keyswitch to ground?No30NoYes7.5Does voltage appearfrom terminal 'B' ofmain fuse to ground?IGN/SOL FUSEYes30Does voltage appearfrom terminal 'A' ofmain fuse to ground?START FUSENoBAREGULATOR FUSEH G10Replace ignitionfuse.PTO FUSEYesACCESSORY SLOTDoes voltage appearfrom terminal 'G' ofignition fuse toground?ACCESSORY SLOTDoes voltage appearfrom black wire onpositive terminal ofignition coil toground? *CDFigure 18K E YS W IT C HNo( In r u n p o s itio n )Test battery.R E D/ W H IT EM A INF U S EB L A C KReplace key switch.R E DR E D * For models 329/729& 432/932, test for voltage at red wire in white2-way plug located directly below carburetoron engine.Rev. 01-14/ W H IT E-1 91 75 0A CR E D3 0R E L A Y AY E L L O W/ B R O W NFigure 1925T OS A F E T YS W IT C H E SIG N IT IO NF U S EIG N IT IO NC O ILB L A C KC O IL
ENGINE WILL CRANK, BUT NOT STARTALL KUBOTA DIESEL MODELSEXCEPT THOSE WITH D902 ENGINESSteering levers out,PTO switch 'OFF'.Voltage tests areperformed with avoltmeter or test lightto battery ground(negative post).Notes:1. All tests are made with wires in place ontheir respective switches.2. Refer to fuse block diagram for terminallocations.3. Refer to “Troubleshooting Control Relays”for information on the diode and controlrelays.4. If engine will crank, control relay “B” isfunctioning properly. This means that thePTO switch, right steering switch and leftsteering switch are functioning properly.Key switch is held in'START' position foreach test untilotherwise noted.NoDoes voltage appearfrom 'PULL' wire ofthe fuel solenoid toground?YesThis is anis inengineignitionYes ProblemYescoilrelatedor distributor.problem.Consult Kubotaengineenginerepair manualmanual forforfurtherrepair.information.Does fuel solenoidengage whilecranking?NoNoKey switch is OFFduring each test.Does 'COMM'terminal of fuelsolenoid showground?Test in-line fuse andfuse holder.YesNoDoes resistancemeasureapproximately .2 to.5 ohms from 'PULL'terminal to 'COMM'terminal of fuelsolenoid?Repair groundconnection to'COMM' terminal offuel solenoid.YesFuel solenoidlinkage is binding orsticking.NoReplace CKBLACKRED / WHITEWHITERED / WHITE(In run position)BLACK150REDFUELSOLENOIDMODULERELAY AYELLOW/ BROWNREDTO SAFETYPULL-AC303COMM1917FUELSOLENOID42HOLD GREENSWITCHESBattery CableREDSTARTERIN-LINEFUSEHOLDERBLACKFigure 2026Rev. 10-08
ENGINE WILL CRANK, BUT NOT STARTKUBOTA DIESEL MODELS WITH D902ENGINESIf engine will crank, control relay "B" is functioning properly. This means that the PTOswitch, right steering switch and left steeri
price 12.00 all models serial numbers 470000 thru 6299999 service manual electrical troubleshooting volume 2 form 172111-160216 printed in u.s.a. the grasshopper company moundridge
