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Rev. AGroundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 45
Procedure for Traction Circuit Reducing Valve (PR)
Pressure Test
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. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
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.
3. Connect a 1000 PSI (70 bar) pressure gauge to test
port on 4WD manifold under radiator (Fig. 32).
4. Start the engine and put throttle at high idle speed
(2870 RPM). Make sure that Hi/Low speed switch is in
the Low speed (4WD) position.
5. Sit o n seat, apply brakes fully and slowly depress the
traction pedal in the reverse direction. While pushing
traction pedal, look at pressure reading on gauge:
GAUGE READING TO BE approximately 650 PSI
(45 bar).
6. Stop engine and record test results.
7. Pressure reducing valve (PR) is located on the front
side of the 4WD manifold (Fig. 33). Adjustment of this
valve can be performed as follows:
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 t he 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 press ure setting, remove cap on re-
ducing valve and turn t he 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 reducing valve (PR) pressure setting
and readjust as needed.
8. When testing is completed, disconnect pressure
gauge from manifold test port.
1. 4WD manifold 2. Pressure test port
Figure 32
2
1
1. 4WD manifold (front) 2. Reducing valve (PR)
Figure 33
1
2
Figure 34
1. Relief valve cap 2. Adjustment socket
1
2
Hydraulic
System