ProcedureforTractionCircuitReducingValve(PR1)
Pressure Test
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-
1
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
2
CAUTION
Figure 49
2WD/4WD control manifold (GM 4500--D shown)
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.
1.
2.
3.
control manifold under operator’s seat (Fig. 49).
Connect a 1000 PSI gauge to test port on 2WD/4WD
4.
(2800
Start the engine and put throttle at full engine speed
+ 50 RPM).
5.
traction pedal in the reverse direction. While pushing
traction pedal, look at pressure reading on gauge:
Sitonseat,applybrakesfully,andslowlydepressthe
1
2
GAUGE READING TO BE 420 to 470 PSI.
Figure 50
1.
Manifold: lower side
2. Reducing valve (PR1)
6.
Pressure reducing valve (PR1) is located on the low-
er, rear side of the 2WD/4WD control manifold (Fig. 50).
Adjustment of this valve can be performed as follows:
NOTE: Do not remove the valve from the hydraulic
manifold for adjustment.
A. To increase pressure setting, remove cap on re-
ducing valve and turn the adjustment socket on the
valve in a clockwise direction. A 1/8 turn on the sock-
et will make a measurable change in pressure set-
ting.
B. To decrease pressure setting, remove cap on re-
ducing valve and turn the adjustment socket on the
valve in a counterclockwise direction. A 1/8 turn on
the socket will make a measurable change in pres-
sure setting.
C. Recheck pressure setting and readjust as need-
ed.
Groundsmaster 4500--D/4700--D
Page 4 -- 49
Hydraulic System (Rev. A)
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