TEST NO. 2: Checking Counterbalance Pressure
1. Make sure hydraulic oil is at normal operating tem-
perature by operating machine for approximately 10
minutes.
2. Lower cutting units, engage parking brake and stop
t
he engine.
3. Raise and support seat to get access to hydraulic test
fittin
gs.
4. Install a 1000 PSI gauge into the counterbalance/lift
circuit quick disconnect fitting.
5. Start the engine, move throttle to full speed
(3000 RPM) and observe gauge.
Figure 10
1
TESTER READING: 600 - 650 PSI (oil at normal
1. Counterbalance/lift circuit test port
1
operating temperature)
Counterbalance Relief Valve Adjustment
6. If necessary adjust the relief valve screw until the
d
esired pressure is attained. Adjust nearer the high end
of the range for improved hill climbing or nearer the low
end for improved quality of cut.
CAUTION
When adjusting counterbalance relief valve,
do not unscrew relief valve adjuster too far.
Watch pressure gauge while adjusting valve.
Figure 11
Stop unscrewing valve adjuster when pres-
sure no longer decreases.
1. Counterbalance relief valve
Hydraulic System
Groundsmaster
®
455-D Page 4 - 21
Rev. A
Testing
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