Procedure for Rear Traction Circuit (RV5) Relief
Pressure 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 engaged.
Park machine on a level surface with the cutting
2
CAUTION
Figure 37
1.
2.
2WD/4WD control manifold
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.
control manifold under radiator (Fig. 37).
Connect a 1000 PSI gauge to test port on 2WD/4WD
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
1
5.
Operate the engine at full engine speed (2730 + 30
RPM).
Figure 38
2.
6.
Operate the machine in 4WD with the cutting decks
1.
Manifold: lower side
Relief valve (RV5)
lowered. Drive down a slope in a forward direction, de-
crease pressure on the traction pedal, and monitor the
pressure gauge. Pressure should increase until the re-
lief valve (RV5) lifts. Record test results.
GAUGE READING TO BE 750 PSI (approximate).
7.
of the 2WD/4WD control manifold (Fig. 38). Adjustment
of the relief valve can be performed as follows:
Relief valve (RV5) is located on the lower, front side
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. 39).
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. 39).
Figure 39
1.
Relief valve cap
2.
Adjustment socket
C. Recheck relief pressure and readjust as needed.
8.
Disconnect pressure gauge from test port.
Groundsmaster 4100--D
Page 4 -- 45
Hydraulic System
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