ProcedureforRearTractionCircuit(RV)ReliefPres-
sure Test
1
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
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 26
1.
4WD control manifold
2.
Relief valve test port
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.
2
3.
4WD control manifold under radiator (Fig. 26).
Connect a 1000 PSI (70 bar) gauge to test port on
4.
(2870
Start the engine and put throttle at full engine speed
RPM). Make sure that transport/4WD switch is in
the 4WD position.
1
5.
Operate the machine in 4WD (not transport speed)
with the cutting decks lowered. Drive down a slope in a
forward direction, decrease pressure on the traction
pedalandmonitor the pressure gauge. Pressure should
increase until the relief valve lifts.
Figure 27
2.
1.
Manifold: lower side
Relief valve (RV)
GAUGEREADINGTOBE750PSI(52bar)(approx-
imate).
6.
7.
of the 4WD control manifold (Fig. 27). Adjustment of the
relief valve (RV) can be performed as follows:
Stop engine and record test results.
Relief valve (RV) is located on the lower, front side
1
NOTE: Do not remove the valve from the hydraulic
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. 28).
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. 28).
Figure 28
2.
1.
Relief valve cap
Adjustment socket
C. Recheck relief pressure and readjust as needed.
8.
When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4000--D
Page 4 -- 39
Hydraulic System
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