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Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 47
Procedure for Traction Circuit Reducing Valve (PR)
Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Park machine on alevel surface withthe cutting units
lowered and off. Make sure engine is off and the parking
brake is engaged.
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 gauge to test port on 2WD/4WD
control manifold under radiator (Fig. 36).
4. Start the engine and put throttle at full engine speed
(2730 +
30 RPM).
5. Siton seat, apply brakes fully, andslowly depress the
traction pedal in the reverse direction. While pushing
traction pedal, look at pressure reading on gauge:
GAUGEREADINGTOBE650 PSI (approximate).
6. Pressurereducing valve (PR) is located on the lower,
front side of the 2WD/4WD control manifold (Fig. 37).
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
valveinaclockwisedirection.A1/8turnonthesock-
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 s ocket will make a measurable change in pres-
sure setting.
C. Recheck pressure setting and readjust as need-
ed.
1. 2WD/4WD control manifold
2. Pressure test port
Figure 36
1
2
1. Manifold: lower side 2. Reducing valve (PR)
Figure 37
2
1
Hydraulic
System