Disassembly (Fig. 96)
Removeoilfromliftcylinderintoadrainpanbyslowly
pumping the cylinder shaft. Plug both ports and clean
the outside of the cylinder.
Assembly (Fig. 96)
1.
1. Make sure all lift cylinder parts are clean before as-
sembly.
2.
Coat new O--rings, back--up washer and other seals
IMPORTANT: Prevent damage when clamping the
lift cylinder into a vise; clamp on the clevis end of
the barrel ONLY.
with clean hydraulic oil. Carefully install new seals,
back--up rings and O--rings to head and piston.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Clamp on the clevis ONLY.
2.
Mount lift cylinder securely in a vise by clamping on
the clevis end of the barrel. Use of a vise with soft jaws
is recommended.
3.
vis of the shaft.
Mountshaftsecurelyinavisebyclampingonthecle-
3.
Using a spanner wrench, rotate head clockwise until
A. Coat shaft with clean hydraulic oil.
B. Slide head onto the shaft.
the edge ofthe retaining ring (item 6) appears in the bar-
rel opening. Insert a screwdriver under the beveled
edge of the retaining ring to start the retaining ring
through the opening. Rotate the head counter--clock-
wise to remove retaining ring from barrel and head.
C. Install piston onto the shaft and secure with lock
nut. Torque lock nut 40 ft--lb (54 N--m).
4.
piston by carefully twisting and pulling on the shaft.
Remove plugs from ports. Extract shaft, head and
D. Remove shaft assembly from the vise.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on the clevis
end of the barrel ONLY.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Clamp on the clevis ONLY.
5.
vis of the shaft. Remove lock nut and piston from the
shaft. Carefully slide head off the shaft.
Mountshaftsecurelyinavisebyclampingonthecle-
4.
clevis end of the barrel.
Mount barrel securely in a vise by clamping on the
IMPORTANT: When installing the head into the bar-
rel, pay careful attention to the retaining ring slot in
thebarreltoinsurethatthepistonandheadsealsdo
not lodge in the slot.
6.
remove and discard all seals, back--up rings and O--
rings from head and piston.
Taking care to not scratch or damage components,
Inspection
5.
Coat all internal parts with a light coat of clean hy-
draulic oil. Slide piston, shaft and head assembly into
the barrel being careful not to damage the seals.
CAUTION
6.
Secure head in barrel with retaining ring.
Use eye protection such as goggles when using
compressed air.
A. Align retaining ring hole in the head with the ac-
cess slot in the barrel.
B. Insert the retaining ring hook into the hole and ro-
tate head clockwise until the retaining ring is com-
pletely pulled into the barrel and the ring ends are
covered.
1.
Dry parts with compressed air.
Wash all lift cylinder components in clean solvent.
2.
Inspect internal surface of barrel for deep scratches,
out--of--roundness and bending.
C. Apply silicone sealer to barrel access slot.
3.
Inspect head, shaft and piston for excessive pitting,
scoring and wear.
4.
Replace liftcylinder ifinternal components arefound
to be worn or damaged.
Groundsmaster 4300--D
Page 4 -- 107
Hydraulic System
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