Lift Cylinder Internal Leakage Test
TO STEERING
CONTROL VALVE
TO DECK CONTROL MANIFOLD
(FRONT CUTTING UNITS)
TO DECK CONTROL MANIFOLD
(REAR CUTTING UNITS)
(PARTIALLY
RAISED)
GEAR
PUMP
PLUG
CAP
PUMP (P5)
INTERNAL
CASE
DRAIN
CHECK FOR
CYLINDER
EXTENDING
FROM MOW CONTROL
MANIFOLD
LIFT
CONTROL
MANIFOLD
LEFT FRONT (#4) LIFT CYLINDER TEST SHOWN
Figure 55
The lift cylinder internal leakage test should be per-
formed if a cutting deck raise and lower problem is iden-
tified. This test will determine if a lift cylinder is faulty.
1. Park machine on a level surface with the PTO switch
OFF. Position the cutting decks in the turn--around posi-
tion and turn the engine off. Apply the parking brake.
NOTE: Cuttingdeckraise/lowercircuitoperationwillbe
affected by lift cylinder binding, extra weight on the cut-
ting decks and/or binding of lift components. Make sure
that these items are checked before proceeding with lift
cylinder internal leakage test.
2. For the lift cylinder that is to be tested, use a jack to
raise the lift arm slightly. This will remove the load from
the lift cylinder and relieve lift cylinder hydraulic pres-
sure. Leave the jack under the lift arm to support the lift
arm and to prevent the lift arm from lowering.
Procedure for Lift Cylinder Internal Leakage Test:
NOTE: If either of the rear lift cylinders is being tested,
both rear lift arms need to be supported.
NOTE: When performing the lift cylinder internal leak-
age test, the cutting decks should be attached to the lift
arms.
3. Thoroughly clean the area around the end of the hy-
draulichoseattherodendoftheliftcylinder.Disconnect
the hydraulic hose from the lift cylinder rod end fitting
(Fig. 56).
Hydraulic System
Page 4 -- 54
Groundsmaster 4300--D
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| Tags | Toro Groundsmaster 4300 D |
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| Language | English |
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