Toro Groundsmaster 4100-D Service Manual page 89

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
decks 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. 40).
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Operate the engine at full engine speed (2730 + 30
RPM).
6. 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).
7. Stop engine and record test results.
8. Pressure reducing valve (PR) is located on the lower,
front side of the 2WD/4WD control manifold (Fig. 41).
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 reducing valve (PR) pressure setting
and readjust as needed.
9. Disconnect pressure gauge from test port.
Groundsmaster 4100--D
1. 2WD/4WD control manifold
2. Pressure test port
1
1. Manifold: lower side
Page 4 - - 47
1
2
Figure 40
2
Figure 41
2. Reducing valve (PR)
Hydraulic System