Service Manual

EngineCoolingFanCircuitProblems
Problem
PossibleCause
Coolingfanrunsonlyinforwarddirection(fan
doesnotruninreversedirection).
Solenoidcartridgevalve(S10)incombination
controlmanifoldisfaulty.
Electricalproblemexiststhatprevents
combinationcontrolmanifoldsolenoidvalve
(S10)operation(seeChapter6:Electrical
System(page6–1)).
Coolingfandoesnotrotate.Coolingfanmotoriswornordamaged.
Proportionalreliefvalve(PRV)incombination
manifoldisstuckordamaged.
Gearpumpsectionforenginecoolingfan
circuitiswornordamaged(NOTE:Awornor
damagedgearpumpsectionwillalsoaffectthe
steering,lift/lowerandtractionchargecircuits).
Coolingfanalwaysrotatesatslowspeed.Combinationmanifoldcartridgevalveseals
areleaking.
Checkvalveincombinationmanifoldisnot
seating.
Proportionalreliefvalve(PRV)incombination
manifoldisstuckordamaged.
Hydraulicfanmotoriswornordamaged.
Coolingfanalwaysrotatesatfastspeed.Proportionalreliefvalve(PRV)incombination
manifoldisfaulty.
Electricalproblemsexiststhatpreventscorrect
operationofcombinationmanifoldproportional
reliefvalve(PRV)(seeChapter6:Electrical
System(page6–1)).
Troubleshooting:Page3–8
Groundsmaster
®
4100-D&4110-D
13203SLRevF