Toro Groundsmaster 4000-D Service Manual page 83

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 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
(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 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.
8. When testing is completed, disconnect pressure
gauge from manifold test port.
Groundsmaster 4000--D/4010--D
1. 4WD manifold
1
2
1. 4WD manifold (front)
1. Relief valve cap
Page 4 - - 45 Rev. A
1
2
Figure 32
2. Pressure test port
Figure 33
2. Reducing valve (PR)
2
Figure 34
2. Adjustment socket
Hydraulic System
1