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Groundsmaster 4100--D Hydraulic SystemPage 4 -- 39
Procedure for RearTractionCircuit(RV) Relief Pres-
sure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Parkmachineon a level surface with thecuttingdeck
lowered and off. Make sure engine is off and the parking
brake is engaged.
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. Connect a 1000 PSI (70 bar) gauge to test port on
4WD control manifold under radiator (Fig. 26).
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Operatetheengine at full engine speed(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
pedal and monitor the pressure gauge. Pressure should
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
of the 4WD control manifold (Fig. 27). Adjustment of the
relief valve can be performed as follows:
NOTE: Do not remove the r elief valve from the hy-
draulic 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).
B. To decrease pressuresetting,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 w ill make a measurable change in relief
pressure (Fig. 28).
C. Recheck relief pressure and readjust as 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