Toro Groundsmaster 4000-D Service Manual page 81

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 a level surface with the 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. Sit on 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 650 PSI (approximate).
6. Pressure reducing 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
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 pressure setting and readjust as need-
ed.
Groundsmaster 4000--D
1. 2WD/4WD control manifold
2. Pressure test port
1
1. Manifold: lower side
Page 4 - - 47
1
2
Figure 36
2
Figure 37
2. Reducing valve (PR)
Hydraulic System (Rev. B)