user manual

Groundsmaster 4100--D Hydraulic SystemPage 4 -- 39
ProcedureforRearTractionCircuit(RV)ReliefPres-
sure Test
1. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximately10
minutes. Make sure the hydraulic tank is full.
2. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineisoffandtheparking
brake is engaged.
CAUTION
Prevent personal injuryand/or damageto equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Connect a 1000 PSI (70 bar) gauge to test port on
4WD control manifold under radiator (Fig. 26).
4. After installingpressure gauge, startengine andrun
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Operatetheengineatfullenginespeed(2870RPM).
6. Operate the machine in 4WD (not transport speed)
with the cutting deck lowered. Drive down a slope in a
forward direction, decrease pressure on the traction
pedalandmonitorthepressuregauge.Pressureshould
increase until the relief valve (RV) lifts. Record test re-
sults.
GAUGE READING TO BE 750 PSI (52 bar)
(approximate).
7. Relief valve (RV) is located on the lower, front side
ofthe4WD controlmanifold(Fig.27). Adjustmentof the
relief valve can be performed as follows:
NOTE: Do not remove the relief valve from the hy-
draulic manifold for adjustment.
A. To increase relief pressure setting, remove cap
onrelief valveandturn theadjustmentsocket onthe
reliefvalve ina clockwisedirection.A 1/8turn onthe
socketwillmakeameasurablechangeinreliefpres-
sure (Fig. 28).
B. Todecreasepressuresetting,removecaponre-
liefvalveandturntheadjustmentsocketontherelief
valve in a counterclockwise direction. A 1/8 turn on
the socket will make a measurable change in relief
pressure (Fig. 28).
C. Recheckreliefpressure andreadjustas needed.
8. When testing is completed, disconnect pressure
gauge from test port.
1. 4WD control manifold
2. Relief valve test port
Figure 26
1
2
1. Manifold: lower side 2. Relief valve (RV)
Figure 27
1
2
Figure 28
1. Relief valve cap 2. Adjustment socket
1
2
Hydraulic
System