Procedure for Counterbalance (RV1) Pressure Test
Make sure hydraulic oil is at normal operating tem-
1.
1
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
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.
Figure 44
Traction assist manifold (GM 4500--D shown)
Counterbalance test port
1.
2.
3.
port on power down and traction assist manifold under
operator’s seat (Fig. 44).
Connect a 1000 PSI gauge to counterbalance test
3
3
4.
(2800
Start the engine and put throttle at full engine speed
+50RPM) withnoloadonthesystem. Donoten-
gage the cutting units.
GAUGE READING TO BE 600 to 640 PSI.
NOTE: Counterbalance pressure setting toward the
higher specification (640 PSI) will improve traction on
slopes. Counterbalance pressure setting toward the
lower specification (600 PSI) improves quality of cut.
2
1
5.
formed as follows:
Adjustment of the counterbalance valve can be per-
Figure 45
1.
2.
3.
GM 4500--D traction assist manifold
GM 4700--D traction assist manifold
Counterbalance valve (RV1)
NOTE: Do not remove the valve from the hydraulic
manifold for adjustment.
A. To increase pressure setting, turn the adjusting
dial on the counterbalance valve in a clockwise di-
rection. A 1/8 turn on the dial will make ameasurable
change in counterbalance pressure (Fig. 45).
B. To decrease pressure setting, turn the adjusting
dial on the counterbalance valve in a counterclock-
wise direction. A1/8 turn on the dial will make amea-
surable change in counterbalance pressure (Fig.
45).
C. Recheck counterbalance pressure and readjust
as needed.
Groundsmaster 4500--D/4700--D
Page 4 -- 45
Hydraulic System (Rev. A)
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