NOTE: Adjustable relief valve (RV) in the 4WD/2WD
control manifold reduces rear axle motor pressure
created in down hill, dynamic braking conditions to pre-
vent rear wheel lock up.
C. After adjustment ismade,recheck reliefpressure
and make additional adjustment if necessary.
ProcedureforRearTractionCircuitRelief(RV)Pres-
sure Test
RIGHT
FRONT
1.
Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
minutes. Make sure the hydraulic tank is full.
(10)
1
2.
decks lowered and off. Make sure engine is off and the
parking brake is engaged.
Park machine on a level surface with the cutting
2
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3.
port G on on rear side of 4WD/2WD control manifold un-
der operator’s platform (Fig. 36).
Connect a 1000 PSI (70 bar) pressure gauge to test
Figure 36
1.
4WD/2WD manifold
2.
Relief valve (RV)
4.
(2870
Start the engine and put throttle at full engine speed
RPM).
5.
Operate the machine in Low speed with the cutting
deckslowered.Drivedownaslopeinaforwarddirection
and decrease pressure on the traction pedal while care-
fullymonitoringthepressuregauge.Pressureshouldin-
crease until the relief valve lifts.
1
GAUGE READING TO BE 520 to 570 PSI (36 to 39
bar)
6.
4WD/2WD control manifold in the RV port (Fig. 36). Ad-
justment of the relief valve can be performed as follows:
Relief valve (RV) is located on the left side of the
2
NOTE: Do not remove the relief valve from the hydrau-
lic manifold for adjustment.
A. To increase relief pressure setting, remove cap
on relief valve and turn the adjustment socket on the
relief valve in a clockwise direction (Fig. 37). A 1/8
turn on the socket will make a measurable change in
relief pressure.
Figure 37
1.
Relief valve cap
2.
Adjustment socket
B. To decrease pressure setting, remove cap on re-
lief valve and turn the adjustment socket on the relief
valve in a counterclockwise direction (Fig. 37). A 1/8
turn on the socket will make a measurable change in
relief pressure.
Groundsmaster 4500--D/4700--D
Page 4 -- 47
Hydraulic System
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