caution - Toro
caution - Toro
caution - Toro
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Procedure for Counterbalance Pressure 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 />
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. Remove console cover.<br />
CAUTION<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 />
C. To decrease pressure setting, turn the adjustment<br />
screw on the valve in a counterclockwise direction.<br />
A 1/8 turn on the screw will make a measurable<br />
change in counterbalance pressure.<br />
D. Tighten locknut to secure adjustment. After adjustment,<br />
recheck counterbalance pressure. Readjust<br />
as needed.<br />
9. When testing is completed, disconnect pressure<br />
gauge from test port.<br />
3<br />
4<br />
2<br />
3. Determine system charge pressure (see Traction<br />
Circuit Charge Pressure in this chapter).<br />
4. Connect a 1000 PSI (70 bar) gauge to counterbalance<br />
test port on manifold under console (Fig. 25).<br />
5. After installing pressure gauge, start engine and run<br />
at idle speed. Check for hydraulic leakage and correct<br />
before proceeding with test.<br />
6. Operate the engine at full engine speed (2870 RPM)<br />
with no load on the system. Do not engage the cutting<br />
deck.<br />
GAUGE READING TO BE 225 PSI (15.5 bar) over<br />
system charge pressure (e.g. if charge pressure is<br />
250 PSI (17.2 bar), counterbalance pressure should<br />
be 475 PSI (32.7 bar)).<br />
7. Stop the engine and record test results.<br />
8. Adjustment of the counterbalance valve can be performed<br />
as follows:<br />
NOTE: Do not remove the counterbalance valve<br />
from the hydraulic manifold for adjustment.<br />
A. Loosen locknut on counterbalance valve (Fig.<br />
25).<br />
B. To increase pressure setting, turn the adjustment<br />
screw on the valve in a clockwise direction. A<br />
1/8 turn on the screw will make a measurable change<br />
in counterbalance pressure.<br />
1<br />
1. Counterbalance test port<br />
2. Counterbalance valve<br />
Figure 25<br />
3. Locknut<br />
4. Adjusting screw<br />
Hydraulic<br />
System<br />
Groundsmaster 4100--D<br />
Page 4 - 37<br />
Hydraulic System
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