caution - Toro
caution - Toro
caution - Toro
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Procedure for Rear Traction Circuit (RV) Relief Pressure<br />
Test<br />
1. Make sure hydraulic oil is at normal operating temperature<br />
by operating the machine for approximately 10<br />
minutes. Make sure the hydraulic tank is full.<br />
8. When testing is completed, disconnect pressure<br />
gauge from test port.<br />
1<br />
2. Park machine on a level surface with the cutting deck<br />
lowered and off. Make sure engine is off and the parking<br />
brake is engaged.<br />
CAUTION<br />
2<br />
Prevent personal injury and/or damage to equipment.<br />
Read all WARNINGS, CAUTIONS and Pre<strong>caution</strong>s<br />
for Hydraulic Testing at the beginning<br />
of this section.<br />
Figure 26<br />
1. 4WD control manifold<br />
2. Relief valve test port<br />
3. Connect a 1000 PSI (70 bar) gauge to test port on<br />
4WD control manifold under radiator (Fig. 26).<br />
4. After installing pressure gauge, start engine and run<br />
at idle speed. Check for hydraulic leakage and correct<br />
before proceeding with test.<br />
5. Operate the engine at full engine speed (2870 RPM).<br />
6. Operate the machine in 4WD (not transport speed)<br />
with the cutting deck lowered. Drive down a slope in a<br />
forward direction, decrease pressure on the traction<br />
pedal and monitor the pressure gauge. Pressure should<br />
increase until the relief valve (RV) lifts. Record test results.<br />
GAUGE READING TO BE 750 PSI (52 bar)<br />
(approximate).<br />
7. Relief valve (RV) is located on the lower, front side<br />
of the 4WD control manifold (Fig. 27). Adjustment of the<br />
relief valve can be performed as follows:<br />
1<br />
Figure 27<br />
1. Manifold: lower side 2. Relief valve (RV)<br />
2<br />
Hydraulic<br />
System<br />
NOTE: Do not remove the relief valve from the hydraulic<br />
manifold for adjustment.<br />
1<br />
A. To increase relief pressure setting, remove cap<br />
on relief valve and turn the adjustment socket on the<br />
relief valve in a clockwise direction. A 1/8 turn on the<br />
socket will make a measurable change in relief pressure<br />
(Fig. 28).<br />
B. To decrease pressure setting, remove cap on relief<br />
valve and turn the adjustment socket on the relief<br />
valve in a counterclockwise direction. A 1/8 turn on<br />
the socket will make a measurable change in relief<br />
pressure (Fig. 28).<br />
C. Recheck relief pressure and readjust as needed.<br />
Figure 28<br />
1. Relief valve cap 2. Adjustment socket<br />
2<br />
Groundsmaster 4100--D<br />
Page 4 - 39<br />
Hydraulic System
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