Toro Groundsmaster 4300-D Service Manual page 144

Test Procedure
Hydraulic System: Testing the Hydraulic System
Note: When performing the lift cylinder internal leakage test, the cutting decks
should be attached to the lift arms.
g189903
1. #5 lift cylinder
2. Cylinder rod end fitting
1. Park the machine on a level surface with the PTO switch off, position the
cutting decks in the turn-around position, shut off the engine, and set the
parking brake.
2. For the lift cylinder that is to be tested, use a jack to raise the lift arm slightly.
This removes the load from the lift cylinder and releases the lift cylinder
hydraulic pressure.
3. Support the lift arm with jack stands to prevent the lift arm from lowering.
Note: If either of the rear lift cylinders is being tested, both the rear lift arms
need to be supported.
4. Clean the area around the hydraulic hose end at the rod end of the lift
cylinder. Disconnect the hydraulic hose from the lift cylinder barrel end fitting
(Figure 76).
When capping the lift cylinder fitting and hydraulic hose end, use
a steel cap and plug to ensure that there is no fluid leakage. The
plastic plugs cannot hold the hydraulic pressure that is developed
during this test procedure.
5. Install a steel cap on the open lift cylinder fitting to seal the lift cylinder. Also,
install a steel plug in the open end of the disconnected hose to prevent
leakage or contamination.
6. Raise the lift arm slightly with a jack and remove the jack stand, then lower
and remove the jack.
7. The capped lift cylinder should be able to support the cutting deck long
enough for the machine to move from one cutting area to another during
operation.
Figure 76
3. Hydraulic hose
IMPORTANT
Page 4–82 Groundsmaster ® 4300-D
16226SL Rev C