Toro Groundsmaster 360 Service Manual page 89

Procedure for Lift Cylinder Internal Leakage Test:
1. Park machine on a level surface with the PTO switch
OFF. Position the cutting deck in a partially raised posi-
tion and turn the engine off. Apply the parking brake.
2. Under both sides of the cutting deck, use a jack to
raise the cutting deck slightly. This will remove the load
from the lift cylinder and relieve lift cylinder hydraulic
pressure. Support both sides of the cutting deck with
jack stands to prevent the lift cylinder from retracting.
3. Thoroughly clean the area around the hydraulic hose
end at the barrel end of the lift cylinder. Disconnect the
hydraulic hose from the lift cylinder barrel end fitting.
IMPORTANT: When capping the lift cylinder fitting
and hydraulic hose end, use a steel cap and plug to
ensure that fluid leakage will not occur. Plastic
plugs will not hold hydraulic pressure that will be
developed during this test procedure.
4. Place 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 con-
tamination.
5. Remove the jack stands from under the cutting deck.
The cutting deck should settle slightly and then be sup-
ported by the capped lift cylinder.
6. Place a piece of tape on the lift cylinder rod near the
rod end (Fig. 42). Measure and record the distance from
the lift cylinder collar to the tape location.
7. Leave the machine parked for two (2) hours and
monitor the lift cylinder. The weight of the cutting deck
may cause the lift cylinder to gradually retract due to in-
ternal leakage in the cylinder. Use the change in dis-
tance from the lift cylinder collar to the tape location to
determine lift cylinder rod movement.
A. If the cutting deck is still suspended after two (2)
hours and lift cylinder rod movement is less than
1.250" (31.7 mm), consider that the lift cylinder is in
good condition. A lift cylinder in good, usable condi-
tion will show minimal rod movement.
B. Rod movement in excess of 1.250" (31.7 mm) af-
ter two (2) hours indicates a lift cylinder with internal
seal damage or excessive internal wear. Replace or
repair the lift cylinder (see Lift Cylinder and Lift Cylin-
der Service in the Service and Repairs section of this
chapter).
Groundsmaster 360
8. Once lift cylinder condition has been determined,
use a jack to raise both sides of the cutting deck slightly
which will remove the load from the lift cylinder. Support
both sides of the cutting deck with jack stands. Remove
the cap from the cylinder fitting and the plug from the hy-
draulic hose. Connect the hydraulic hose to the lift cylin-
der fitting.
9. Remove tape from lift cylinder rod.
10.Remove the jack stands from under the cutting deck.
Start engine and operate lift cylinder through several
raise and lower cycles. Stop the engine and check for
any leakage.
11. Check oil level in hydraulic reservoir.
1. Lift cylinder collar
Page 4 - - 55
MEASURED
DISTANCE
1
Figure 42
2. Tape
Hydraulic System
2