Procedure for Traction Circuit Reducing Valve (PR)
Pressure Test
1
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2.
decks lowered and off. Make sure engine is off and the
parking brake is applied.
Park machine on a level surface with the cutting
2
CAUTION
Figure 35
1.
4WD manifold
2.
Pressure 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
3.
port on 4WD manifold under radiator (Fig. 35).
Connect a 1000 PSI (70 bar) pressure gauge to test
4.
(2870
Start the engine and put throttle at high idle speed
RPM). Make sure that Hi/Low speed switch is in
the Low speed (4WD) position.
2
5.
traction pedal in the reverse direction. While pushing
traction pedal, look at pressure reading on gauge:
Siton seat,apply brakes fully andslowly depress the
Figure 36
1.
4WD manifold (front)
2.
Reducing valve (PR)
GAUGE READING TO BE approximately 650 PSI
(45
bar).
6.
7.
side of the 4WD manifold (Fig. 36). Adjustment of this
valve can be performed as follows:
Stop engine and record test results.
Pressure reducing valve (PR) is located on the front
1
NOTE: Do not remove the pressure reducing 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.
2
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.
Figure 37
C. Recheck pressure setting and readjust as need-
ed.
1.
Relief valve cap
2.
Adjustment socket
8.
When testing is completed, disconnect pressure
gauge from manifold test port.
Groundsmaster 4000--D/4010--D
Page 4 -- 47
Hydraulic System
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