Transcription
SERVICE MANUALELECTRICAL TROUBLESHOOTINGVOLUME 3ALL MODELSSERIAL NUMBERS 6300000 AND UPTHE GRASSHOPPER COMPANYMoundridge, Kansas 67107 U.S.A.(620) 345-8621GRASSHOPPERMOWER.COMPrice 12.00Form 172112-160216Printed 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 & 2015 by The Grasshopper Company. The following material is proprietary information. All rights reserved. Reproduction or dissemination in any form by any means is prohibited, except by express written permission from The Grasshopper Company.2
TABLE OF CONTENTSPAGE2INTRODUCTIONSWITCH FUNCTIONS5-6FUNCTION OF A RELAY7TROUBLESHOOTING CONTROL RELAYSAll Kubota Gasoline Models .8All Kubota Diesel Models .8Control Relay - All Kubota Models .10Circuit Board Diode Problems - All Models .10TESTING SAFETY SYSTEM FOR PROPER OPERATIONAll Briggs & Kohler Models .12All Kubota Models .13BATTERY CHARGING SYSTEMAll Briggs Models & Kohler Models excluding Kohler EFI Models .14All Kubota Models with Smooth Alternators . .15All Kubota Models with Aluminum/Finned Alternators .16ENGINE WILL NOT CRANK124, 126, 226V and 616T Series Models . 18-19125 Kohler, 200 Series Models except 226V, All Briggs Big Block Models,620T & 623T Models and all 700 Kohler Models. . 20-21All Kubota Models . 22-23ENGINE WILL CRANK, BUT NOT STARTAll Briggs & 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 Models .28ENGINE STARTS, BUT DIESWHEN KEY SWITCH IS RELEASEDAll Kubota Diesel Models except those with D902 Engines. . 30-31Kubota Diesel Models with D902 Engines .32Briggs & Kohler Models .33(continued)3
TABLE OF CONTENTS(CONTINUED)ENGINE 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 .38High Temperature Clutch Cutout Wiring .39TROUBLESHOOTING ELECTRIC LIFTElectric Lift Does Not Operate . 40-43Wiring Diagram .44HYDRAULIC LIFT DOES NOT WORKHydraulic Dozer Electrical Troubleshooting .45One Piece Tilt Switch/Delay Timer Style . 46-47JOYSTICK WIRING TROUBLESHOOTINGJoystick Wiring Troubleshooting - Total Loss of Motion.48Joystick Wiring Troubleshooting - Loss of Motion in One Direction .49TRACTOR ACCESSORY HARNESS TROUBLESHOOTINGAll Models . 50-524
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.M1917NC NONC NOIgnition 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.RELEASEDNO (normally open) - means that the contact isopen with the switch mechanism released.When the button is depressed, these twoterminals become closed.DEPRESSEDThe dotted line indicates an electrical connection between the two terminal posts.5
SWITCH FUNCTIONSNOLeft 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.NCNO (normally open) - means that the contactis open with the switch mechanism released. The contact position is reversedwhen the switch lever is depressed.NCCOM M ONRELEASEDCOM M ONNOThe dotted line indicates an electrical connection between the two terminal posts.DEPRESSEDOFFONPTO switch, part no. 183925.The dotted line indicates an electrical connection between the two terminal posts.Seat switch, part no. 183871.The dotted line indicates an electrical connection between the two terminal posts.RELEASEDDEPRESSED6
FUNCTION OF A ZED - Means that terminal 30 and terminal 87a are connectedwhen the relay is not energized87ENERGIZED8687A87a85303087ENERGIZED - Means that terminal 30 and terminal 87 are connected when therelay is energizedCONTROL RELAY OPERATIONFRONT MOUNTMID MOUNTARun Relay - AccessoryRun Relay - AccessoryBStart RelayStart RelayCHigh Temp - Outputfrom the Temp Gauge“Latch Up Relay”High Temp - Outputfrom the Temp Gauge“Latch Up Relay”DHigh Temp - OpensClutch CircuitHigh Temp - OpensClutch CircuitEUniversal Harness Opens Clutch CircuitSwitches 12 Volts toDeck Height Pump7
TROUBLESHOOTING CONTROL RELAYSALL KUBOTA GASOLINE MODELSALL KUBOTA DIESEL MODELS1. Control relay - inspection.A. Control relay A has 2 red wires, 2 blackwires, 1 yellow wire and 2 green wiresin 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, 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. Ignition coil will not have voltage on thepositive 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, 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 voltage).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.Figure 1To mainfuseRed w/WhiteTo padYellow w/BrownA of PCboardRelay C 12 volts with keyswitch in ‘RUN’positionBlackBlackGreenTo G terminal Greenon Voltmeter 12 volts with relayGauge‘A’ is energizedRedTo pad Mof PC boardTo I terminalon VoltmeterGaugeTo PTO fuse &ignition fuseFigure 2To padR of PCboardThis wire goes to ground when:1. Driver on seat and parking brake released,2. or PTO off, both steering levers out,3. or both of the above.Run Relay - AccessoryTo startfuseBlueGreen w/YellowThis wire goes toground with steeringlevers out and PTO off 12 volts with keyswitch in ‘START’position 12 volts with relay‘B’ is energizedBlue8StartersolenoidStart Relay
PurpleTemp Light 12 volts withkey in the ‘RUN’positionPurpleThis wire goes toground whenthe temp gaugeneedle gets intothe red.BlackTo Relay DBlackTo Relay ACPurpleGRelay DreenGreenRelay ATo Pad Gof PC BoardThis is aground wireHigh Temp Relay - Temp. Gauge CircuitFigure 3To Pad Pof PC Board 12 volts with‘PTO’ Switch onBrownTo Temp Gauge Purple 12 volts withkey in the ‘RUN’positionBlackTo Relay CBlackTo Pad Mon PC BoardDPurpleTo Relay CTo Relay EBrown 12 volts with‘PTO’ Switch onThis wire goes toground whenthe temp gaugeneedle gets intothe red.High Temp Relay - Clutch CircuitFigure 4 12 volts with‘PTO’ switch onBrownTo UniversalHarnessGreenEThis is aground wireTo Relay DBrown 12 volts with‘PTO’ Switch onTo PTOSwitchBrown To UniversalHarnessSwitched 12volts fromUniversal HarnessUniversal Harness Relay - Clutch CircuitFigure 59
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 7) 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:FUNCTION OF A DIODEAssuming steering levers out and PTOswitch off, engine can be cranked andstarted only with driver on the seat andthe parking brake in the 'OFF' position.The function of a diode is to allow an electriccurrent to pass in one direction (called thediode's forward direction). A diode can bereferred as an electronic check valve.If driver gets off of the seat or puts parkingbrake to the 'ON' position, the engine willdie.Shorted DiodeSYMBOLS USED ON WIRING DIAGRAMSAssuming an operator on the seat andparking brake is 'OFF', engine can becranked and started with PTO switch inthe 'ON' position or steering levers in.Symbol for a diode. The arrowindicates the current flow.Current will not flow in the otherdirection if the diode isworking properly.Figure 6Circuit Board with DiodeRAFigure 710
THIS PAGE IS INTENTIONALLY LEFT BLANK11
TESTING SAFETY SYSTEM FOR PROPER OPERATIONALL BRIGGS 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'?Adjust or replaceright steering switch.NoDoes engine crank YesReplace PTO switch.with only the PTOswitch turned 'ON'?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.NoReplace brakeswitch.12All safety systemsare functioningproperly.
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.ANoTo ANoAdjust 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.13All safety systemsare functioningproperly.
BATTERY CHARGING SYSTEMALL BRIGGS MODELS*ALL KOHLER MODELS EXCLUDINGKOHLER EFI MODELSEngine is not running.Attach DC voltmeter tonegative and positiveposts of battery.Does voltmeter read Yes12.5 DC volts or above?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.Battery is in goodcondition.NoTest and rechargebattery.Start engine andobserve batteryvoltage at fullthrottle.Is voltage at battery Yesbetween 13 and 14.7DC volts?Charging system isfunctioning properly.*NOTE: For a battery charging problem witha Kohler EFI engine, consult the engine repairmanual.NoDisconnect regulator Does voltage appearrectifier plug. PlaceYesat the B teminalACvoltmeter acrossof the regulator AC Terminals in plugrectifier. See diagramand read voltage.for location. Fig 8Fig 8NoDoes voltage readYesless than 28 volts ACwith engine running?Service stator.NoIf AC voltagemeasures more than28 volts replaceregulator - rectifier.BriggsRegulatorB ACWhiteACPurpleACYellowYellowB WhiteFor more detailedtesting consult theengine repairmanual.RedProblem is in supplywire from regulatorfuse to regulatorrectifier.Kohler RegulatorPlugFigure 814
BATTERY CHARGING SYSTEMALL KUBOTA MODELS WITH SMOOTHALTERNATORS W/TWO WIRESEngine 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.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.Is voltage at red wireNoReplace voltageof voltage regulatorregulator.13-14.7 DC volts to ground?YesCheck red wire, regulator fuse andterminals from terminal 30 ofignition switch to voltage regulator.*voltage may vary or - 3 volts.Rev. 02-1615
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 is notrunning.Attach voltmeterto negative andpositive postsof battery.Does voltmeterread 12.5 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.NoTest for voltageat red wire toalternatorNoProblem is withIn-line FuseWireYesDoes voltageappear on whitewire to alternatorwith ignition keyin the “run”position?NoCheck connectionsof white wire fromalternator tothe circuit board.YesDoes green wire Yesat alternator showground whentested to batterypositive?NoCheck groundconnections.16Service AlternatorRegulatorAssembly
THIS PAGE IS INTENTIONALLY LEFT BLANK17
ENGINE WILL NOT CRANK124 & 126 BRIGGS226V BRIGGS616T BRIGGSTest battery forcondition andcharge.Notes:1. Voltage tests are performed with a DC voltmeter.Steering levers out,PTO switch 'OFF'.Voltage tests areperformed with avoltmeter or test lightto battery ground.Warning!Before starting test, remove blue wire fromstarter solenoid to prevent accidental crankingof engine while testing.Key switch is in'START' position foreach test.Reconnect this blue wire upon completion ofthe test.Does voltage appearfrom terminal 'C' ofstart fuse?(See Figure 9)Yes Does voltage appearfrom terminal 'D' ofstart fuse?YesNoReplace 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 918
ENGINE WILL NOT CRANK(CONTINUED)Acontinued fromprevious page124 & 126 BRIGGS226V BRIGGS616T BRIGGSKey switch is in'OFF' position foreach test. You arenow testing a groundcircuit. All tests willbe to the batterypositive side.Does 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 PointsFuse block styles will vary.Be sure you are checking designated fuse.7.5LIGHT FUSEHG107.5FESTART FUSE30REGULATOR FUSEDCPTO FUSEB AFigure 10Rev. 02-1619
ENGINE WILL NOT CRANK125 & 225V KOHLERALL 200 SERIES MODELS EXCEPT 226V329B, 335B, 729BT6 & 735BT6 BRIGGS BIG BLOCK MODELS620T & 623T KOHLERALL 700 SERIES KOHLER MODELSTest battery forcondition andcharge.Notes:1. A 30 amp MASTER fuse is present on all 700 series except 723T.This fuse is in the upper level of fuse block on right side of tractorframe next to seat. Voltage will not reach the key switch if this fuseis blown.2. Do not forget to plug starter relay back in when finished testing.OKSteering levers out,PTO switch 'OFF'.Voltage test isperformed with avoltmeter or test lightto battery ground.Warning!Before starting test, remove blue wire from starter solenoid to prevent accidental cranking of engine while testing.Reconnect this blue wire upon completion of the test.Key switch is in'START' position foreach test.Does voltageappear fromterminal 'C' ofstart fuse?YesDoes voltageappear fromterminal 'D' ofstart fuse?NoYes Does voltageappear onterminal 85 ofstarter relay?NoDoes voltageappear onterminal 87(inline fusewire) ofstarter relay?PTOSWITCH(PTO OFF)(in start position)START STEERINGSWITCHESRIGHTLEFT(PTO OFF)(in start position)(Steering levers out)START FUSEBLUEREDSSLBGINLINEFUSEHOLDERM8786 87a 85BLUEREDSTEERINGSWITCHESRIGHTLEFT(Steering levers out)8786 87a UEBLUERTSTRSTARTERcontinues onnext page125 & 225VREDREDTo ACheck 30 ampin-line fusein wire betweenstarter relay andstarter solenoid.Check wiresfrom startfuse tostarter relay.ALL EXCEPT 125 & 225VKEYSWITCHYesNoNoReplacestart fuse.Problem is the keyswitch or the powerto the key switch.YesYELLOWYELLOWRTSTRLTSTRSTARTERGREEN / YELLOWFigure 11YELLOWYELLOWLTSTRGREEN / YELLOWFigure 1220Rev. 02-16
ENGINE WILL NOT CRANK(CONTINUED)AcontinuedfrompreviouspageDoes voltage appearon terminal 30 ofstarter relay?NoYes Check startersolenoid.Problem couldbe startersolenoid orstarter.Key switch is in'OFF' position foreach test. You arenow testing a groundcircuit. All tests willbe to the batterypositive side.125 & 225V KOHLERALL 200 SERIES MODELS EXCEPT 226V329B, 335B, 729BT6 & 735BT6 BRIGGSBIG BLOCK MODELS620T & 623T KOHLERALL 700 SERIES KOHLER MODELS700 Series KohlerModels except 723TFuse Block Test PointsLIGHT/AUX FUSE - 7.5 AMP.PTO FUSE - 10 AMP.START FUSE - 30 AMP.MASTER FUSE - 30 AMP.Remove the starterrelay. It is located onthe inside of theframe, on the leftside of the engineon Kohler models.HFDREGULATOR FUSE - 30 AMP.BACCESSORY FUSEUNIVERSAL HARNESS FUSE - 10 AMPACCESSORY FUSEDoes either yellowYeswire on rightsteering switch showground when tested?Right steeringswitch isdefective orout ofadjustment.Left steeringswitch isdefective orout ofadjustment.7.5LIGHT FUSE10PTO FUSEReplacePTO switch.NoYesFuse block styles will vary.Be sure you are checking designated fuse.DCFEHGB A7.5YesFigure 13START FUSEReplace thestarter relay.30YesNoDoes either yellowwire on left steeringswitch show groundwhen tested?CANoDoes either yellowwire on PTO switchshow ground whentested?EREGULATOR FUSEDoes the yellow wirewithout the in-linefuse show groundwhen tested?G125 & All 200 Series Models(Regulator fuse absent on 125 & 225V)Figure 14Starter Relay Testing If all safety switches are correct,terminal 86 is grounded. Terminal 87 is 12 volts. Terminal 85 is 12 volts when key switch isin ‘START’ position. Terminal 30 is 12 volts whenrelay is energized.Yellow WireNoCheck groundat engine.8787a8685To pad T of circuit boardFuse holderTo battery30terminal ofstarterBlue WireBlue Wire30Fuse clip toregulator fuseTo pad S of circuit boardTo input terminal of starterFigure 15Rev. 02-1621
ENGINE WILL NOT CRANKALL KUBOTA MODELSTest battery forcondition andcharge.OKNote:Check 30 amp MASTER fuse in lowerlevel of fuse block on right side of tractorframe next to seat. Voltage will not reachkey switch if this fuse is blown.IGNITION FUSE - 7.5 AMP.Steering levers out,PTO switch 'OFF'.Voltage test isperformed with avoltmeter or test lightto battery ground.PTO FUSE - 10 AMP.GAHBMAIN FUSE - 15 AMP.ACCESSORY FUSE - 10AMP.IKey switch is in'START' position foreach test.Does voltage appearfrom terminal 'I' ofstart fuse?Warning!Before starting test, remove bluewire from starter solenoid to preventaccidental cranking of engine whiletesting.JReconnect this blue wire upon completion of the test.MASTER FUSE - 30 AMP.START FUSE - 30 AMP.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.YesNoCheck startersolenoid. Problemcould be startersolenoid or starter.Replace 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 1622Rev. 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'.Relay B8787a8685NoDo 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.Replace left steeringswitch.YesReplace PTO switch.30NoFigure 17Before replacing thesteering switch,check adjustment. Ifit does not clickwhen steering leversare moved in and outadjust the switch.Fuse Block Test PointsFuse block styles will vary.Be sure you are checking designated fuse.IGNITION FUSE - 7.5 AMP.PTO FUSE - 10 AMP.Replace rightsteering switch.GAHBMAIN FUSE - 15 AMP.ACCESSORY FUSE - 10AMP.IJMASTER FUSE - 30 AMP.START FUSE - 30 AMP.Figure 18Rev. 02-1623
ENGINE WILL CRANK, BUT NOT STARTALL BRIGGS MODELSALL KOHLER MODELSNotes:1. Tests are performed after LIGHT/AUXfuse has been checked on all 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.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.24
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.Does voltage appearfrom black wire onpositive terminal ofignition coil toground? *YesProblem is in ignitioncoil or distributor.Consult Kubotaengine manual forrepair.Replace control relayA.NoDoes voltage appearfrom terminal 'G' ofignition fuse toground?Fuse Block Test PointsYesFuse block styles will vary.Be sure you are checking designated fuse.Replace ignitionfuse.IGNITION FUSE - 7.5 AMP.PTO FUSE - 10 AMP.NoDoes voltage appearfrom terminal 'A' ofmain fuse to ground?YesDoes voltage appearfrom terminal 'B' ofmain fuse to ground?NoDoes voltage appearfrom terminal 30(battery) of keyswitch to ground?YesNoYesGAHBACCESSORY FUSE - 10AMP.IReplace main fuse.JMASTER FUSE - 30 AMP.START FUSE - 30 AMP.Figure 19K E YS W IT C HNoTest battery.( In r u n p o s itio n )R E DReplace key switch./ W H IT EM A INF U S ER E D* For models 329/729& 432/932, test for voltage at red wire in white2-way plug located directly below carburetoron engine.MAIN FUSE - 15 AMP.B L A C K/ W H IT ER E D -1 91 75 0A CR E D3 0IG N IT IO NF U S EIG N IT IO NC O ILB L A C KC O ILR E L A Y AY E L L O W/ B R O W NT OS A F E T YS W IT C H E SFigure 2025
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
price 12.00 all models serial numbers 6300000 and up service manual electrical troubleshooting volume 3 form 172112-160216 printed in u.s.a. the grasshopper company moundridge
