Test No. 5: Checking Lift Circuit Working Pressure Or Relief Pressure - Toro Groundsmaster 455-D Service Manual

TEST NO. 5: Checking Lift Circuit Working Pressure or Relief Pressure

WORKING Pressure Check:
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
the engine.
3. Raise and support seat to get access to hydraulic test
fittings. Remove access cover from in front of auxiliary
pump.
4. Install a 5000 PSI gauge onto lift circuit quick discon­
nect fitting. Put gauge and hose through opening below
seat in front of auxiliary pump so gauge can be observed
while sitting on seat.
5. Raise center cutting unit while monitoring gauge.
RANGE OF TESTER READINGS 600 - 2800 PSI
when counterbalance setting is 600 PSI.
NOTE: Changes in counterbalance setting will affect
the lift circuit relief pressure.
RELIEF Pressure Check:
6. With engine running at full speed, engage control
lever into the "LIFT" position.
7. Momentarily hold the lever in the engaged position
after full cylinder extension and read gauge.
TESTER READING TO BE 2600 - 2800 PSI when
counterbalance setting is 600 PSI.
NOTE: Changes in counterbalance setting will affect the
lift circuit relief pressure.
Testing
1
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Figure 14
1. Lift circuit test port
Groundsmaster
®
455-D