Groundsmaster 4300--DHydraulic System Page 4 -- 54
Lift Cylinder Internal Leakage Test
Figure 55
LEFT FRONT (#4) LIFT CYLINDER TEST SHOWN
GEAR
PUMP
LIFT
CONTROL
MANIFOLD
TO STEERING
CONTROL VALVE
INTERNAL
CASE
DRAIN
PUMP (P5)
TO DECK CONTROL MANIFOLD
(REAR CUTTING UNITS)
(FRONT CUTTING UNITS)
TO DECK CONTROL MANIFOLD
FROM MOW CONTROL
MANIFOLD
(PARTIALLY
RAISED)
PLUG CAP
CHECK FOR
CYLINDER
EXTENDING
The lift cylinder internal leakage test should be per-
formedifacuttingdeck raiseandlowerproblemisiden-
tified. This test will determine if a lift cylinder is faulty.
NOTE: Cuttingdeckraise/lowercircuitoperationwillbe
affected by lift cylinder binding, extra weight on the cut-
ting decksand/or bindingof liftc omponents. Make sure
that theseitems arechecked before proceedingwith lift
cylinder internal leakage test.
Procedure for Lift Cylinder Internal Leakage
Test:
NOTE: When performing the lift cylinder internal leak-
age test, the cutting decks should be attached to the lift
arms.
1. ParkmachineonalevelsurfacewiththePTOswitch
OFF.Position thecutting decksintheturn--aroundposi-
tion and turn the engine off. Apply the parking brake.
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.
NOTE: If either of the rear lift cylinders is being tested,
both rear lift arms need to be supported.
3. Thoroughly clean thearea around theend ofthe hy-
draulichoseattherodendoftheliftcylinder.Disconnect
the hydraulic hose from the lift cylinder rod end fitting
(Fig. 56).
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