NOTE: When in reverse, pressure reducing valve (PR)
limits the pressure to the rear axle motor to 450 PSI (31
bar) so the rear wheels will not scuff the turf.
B. To decrease pressure setting, remove cap on re-
ducing valve and turn the adjustment socket on the
valve in a counterclockwise direction (Fig. 40). A 1/8
turn on the socket will make a measurable change in
pressure setting.
Procedure for Traction Circuit Pressure Reducing
Valve (PR) Pressure Test
C. After adjustment ismade,recheck reliefpressure
and make additional adjustment if necessary.
1.
Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
minutes. Make sure the hydraulic tank is full.
(10)
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
1
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.
RIGHT
FRONT
3.
port G on rear side of 4WD/2WD control manifold under
operator’s platform (Fig. 38).
Connect a 1000 PSI (70 bar) pressure gauge to test
Figure 38
4.
(2870
Start the engine and put throttle at full engine speed
RPM).
1.
4WD/2WD manifold
2.
Reducing valve (PR)
5.
Siton seat,apply brakes fully andslowly depress the
traction pedal in the reverse direction. While pushing
traction pedal, carefully monitor the pressure gauge.
Pressure should increase until the pressure reducing
valve opens.
FRONT
GAUGE READING TO BE 420 to 470 PSI (29 to 32
bar).
1
6.
results.
Release traction pedal, stop engine and record test
2
Figure 39
2.
7.
The pressure reducing valve (PR) is located on the
1.
4WD/2WD manifold
Reducing valve (PR)
right side of the 4WD/2WD control manifold in the PR
port(Fig.39).Adjustment ofthisvalvecanbeperformed
as follows:
NOTE: Do not remove the pressure reducing valve
from the hydraulic manifold for adjustment.
2
A. To increase pressure setting, remove cap on re-
ducing valve and turn the adjustment socket on the
valve in a clockwise direction (Fig. 40). A 1/8 turn on
the socket will make a measurable change in pres-
sure setting.
1
Figure 40
1.
Reducing valve cap
2.
Adjustment socket
Groundsmaster 4500--D/4700--D
Page 4 -- 49
Hydraulic System
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| Language | English |
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