ProcedureforRearTractionCircuit(RV)ReliefPres-
sure Test
8. When testing is completed, disconnect pressure
gauge from manifold test port.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
1
2.
decks lowered and off. Make sure engine is off and the
parking brake is applied.
Park machine on a level surface with the cutting
2
CAUTION
Figure 32
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.
1.
4WD manifold
2.
Relief valve test port
2
3.
port on 4WD manifold under radiator (Fig. 32).
Connect a 1000 PSI (70 bar) pressure gauge to test
4.
(2870
Start the engine and put throttle at high idle speed
RPM). Make sure that Hi/Low switch is in the Low
(4WD)
position.
1
5.
Operate the machine in Low speed (4WD) with the
cutting decks lowered. Drive down a slope in a forward
direction, decrease pressure on the traction pedal and
monitor the pressure gauge. Pressure should increase
until the relief valve lifts.
Figure 33
1.
4WD manifold (front)
2.
Relief valve (RV)
GAUGE READING TO BE approximately 750 PSI
(52
bar).
6.
7.
4WD manifold (Fig. 33). Adjustment of the relief valve
(RV) can be performed as follows:
Stop engine and record test results.
Relief valve (RV) is located on the front side of the
1
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. A 1/8 turn on the
socket will make a measurable change in relief pres-
sure (Fig. 34).
2
B. To decrease pressure setting, remove cap on re-
lief valve and turn the adjustment socket on the relief
valve in a counterclockwise direction. A 1/8 turn on
the socket will make a measurable change in relief
pressure (Fig. 34).
Figure 34
1.
Relief valve cap
2.
Adjustment socket
C. Recheck relief pressure and readjust as needed.
Groundsmaster 4000--D/4010--D
Page 4 -- 45
Hydraulic System
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