Toro Groundsmaster
4000?D Service Manual page 82

PRELIMINARY – For Toro Distributor and Toro Company use only.
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.
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. 34).
4. Start the engine and put throttle at full engine speed
(2870 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 approximately 650 PSI.
6. Pressure reducing valve (PR) is located on the lower,
front side of the 2WD/4WD control manifold (Fig. 35).
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.
Hydraulic System
CAUTION
1. 2WD/4WD control manifold
2. Pressure test port
1
1. Manifold: lower side
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1
2
Figure 34
2
Figure 35
2. Reducing valve (PR)
Groundsmaster 4000−D