Service Manual

ProcedureforCounterbalancePressureTest(continued)
2
3
1
g275058
Figure61
1.Combinationmanifold
3.Adjustmentscrew
2.Pressurereducingvalve
6.Thepressurereducingvalveonthecombinationmanifoldisusedtoset
thecounterbalancepressure(Figure61).Ifnecessary,adjustpressure
reducingvalve:
Note:Becauseofvalvedesign,thepressurereducingvalvecanbeadjusted
withtheenginerunning.Donotremovethepressurereducingvalvefromthe
hydraulicmanifoldforadjustment.
A.Locatepressurereducingvalveoncombinationmanifold(Figure61).
Loosenlocknutonpressurereducingvalve.
B.Startengineandincreaseenginespeedtohighidlespeedwithnoload
onthehydraulicsystem.Donotengagethecuttingdecks.
C.Toincreasepressuresetting,turntheadjustmentscrewonthevalvein
aclockwisedirection.A1/8turnonthescrewwillmakeameasurable
changeincounterbalancepressure.
D.Todecreasepressuresetting,turntheadjustmentscrewonthevalve
inacounterclockwisedirection.A1/8turnonthescrewwillmakea
measurablechangeincounterbalancepressure.
E.Tightenlocknuttosecureadjustment.Checkcounterbalancepressure
andreadjustasneeded.
7.Whentestingiscompleted,disconnectpressuregaugefrommanifoldtest
port.Securedustcaptotesttting.Loweroperatorseat.
Groundsmaster
®
4100-D&4110-D
Page5–47
HydraulicSystem:Testing
13203SLRevF