Procedure for Traction Assist (RV2) 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
Figure 51
Traction assist manifold (GM 4500--D shown)
Counterbalance 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.
1.
2.
1
3.
Connect a 1000 PSI gauge to counterbalance test
port on power down and traction assist manifold under
operator’s seat (Fig. 51). Also, connect a 5000 PSI
gauge to forward traction port on traction circuit hydrau-
lic tube (Fig. 52).
4.
(2800
Start the engine and put throttle at full engine speed
+50RPM) withnoloadonthesystem. Donoten-
gage the cutting units.
Figure 52
1.
Forward traction port (faces forward)
5.
Sitonseat,applybrakesfully,andslowlydepressthe
traction pedal in the forward direction. While pushing
traction pedal monitor both pressure gauges.
3
3
6.
1800
As traction circuit pressure reaches approximately
PSI, directional valve (PD3) should shift. This shift
willallowcounterbalance hydraulicflowtobedirectedto
the traction assist valve (RV2). While maintaining trac-
tion circuit pressure, look at pressure reading on gauge
connected to the counterbalance test port:
GAUGE READING TO BE 650 to 750 PSI.
7.
Adjustment of the traction assist valve (RV2) can be
performed as follows:
2
1
NOTE: Do not remove the valve from the hydraulic
manifold for adjustment.
Figure 53
1.
2.
3.
GM 4500--D traction assist manifold
GM 4700--D traction assist manifold
Traction assist valve (RV2)
A. To increase pressure setting, loosen the locknut
and turn the adjusting screw on the relief valve in a
clockwise direction. A 1/8 turn on the dial will make a
measurable change in pressure (Fig. 45).
B. Todecrease pressure setting, loosen the locknut
and turn the adjusting screw on the relief valve in a
counterclockwise direction. A 1/8 turn on the dial will
make a measurable change in pressure (Fig. 45).
C. Recheck pressure and readjust as needed.
Groundsmaster 4500--D/4700--D
Page 4 -- 51
Hydraulic System (Rev. A)
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