Procedure for Traction Circuit Reducing Valve (PR)
Pressure Test
1
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-
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
Figure 40
1.
2.
2WD/4WD control manifold
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.
3.
control manifold under radiator (Fig. 40).
Connect a 1000 PSI gauge to test port on 2WD/4WD
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
1
2
5.
Operate the engine at full engine speed (2730 + 30
RPM).
Figure 41
2.
6.
traction pedal in the reverse direction. While pushing
Sitonseat,applybrakesfully,andslowlydepressthe
1.
Manifold: lower side
Reducing valve (PR)
traction pedal, look at pressure reading on gauge:
GAUGE READING TO BE 650 PSI (approximate).
7.
8.
front side of the 2WD/4WD control manifold (Fig. 41).
Adjustment of this valve can be performed as follows:
Stop engine and record test results.
Pressurereducingvalve(PR)islocatedonthelower,
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 reducing valve (PR) pressure setting
and readjust as needed.
9.
Disconnect pressure gauge from test port.
Groundsmaster 4100--D
Page 4 -- 47
Hydraulic System
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