Toro Groundmaster 31900, Руководство по обслуживанию

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Testing the Steering and Lift Circuit – Lift Cylinder Internal Leakage
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Figure 41
Lift Cylinder Internal Leakage
Perform the lift cylinder internal leakage test if you identify a cutting unit lift or
lower problem. This test determines if the lift cylinder being tested is damaged.
When performing the lift cylinder internal leakage test, the cutting unit should be
attached to the lift arms. Each lift cylinder must be tested individually.
The raise/lower circuit operation can be affected by the lift cylinder binding, extra
weight on the cutting unit, and/or binding of the lift components. Ensure that
these items are checked before performing the lift cylinder internal leakage test.
Note: The relief valve for the lift circuit is integrated into the steering control valve.
Test Procedure
1. Park the machine on a level surface, raise the cutting unit, engage the
parking brake, and set the key switch to the O
FF
position.
2. Use a jack to support the cutting unit and prevent it from lowering. This
removes the load from the lift cylinders and relieves the lift cylinder hydraulic
pressure.
Groundsmaster ® 3200, 3300 and 3310 Page 5–47 Hydraulic System: Testing the Hydraulic System
19240SL Rev A