Service Manual

Groundsmaster 4300--D Hydraulic SystemPage 4 -- 107
Disassembly (Fig. 96)
1. Removeoilfromliftcylinder intoadrainpanbyslowly
pumping the cylinder shaft. Plug both ports and clean
the outside of the cylinder.
IMPORTANT: Prevent damage when clamping the
lift cylinder into a vise; clamp on the clevis end of
the barrel 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. Using a spanner wrench, rotate head clockwise until
the edge of the 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.
4. Remove plugs from ports. Extract shaft, head and
piston by carefully twisting and pulling on the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Clamp on the clevis ONLY.
5. Mountshaft securely inavisebyclampingonthecle-
vis of the shaft. Remove lock nut and piston from the
shaft. Carefully slide head off the shaft.
6. Taking care to not scratch or damage components,
remove and discard all seals, back--up rings and O--
rings from head and piston.
Inspection
CAUTION
Use eye protection such as goggles when using
compressed air.
1. Wash all lift cylinder components in clean solvent.
Dry parts with compressed air.
2. Inspect internal surface of barrel for deep scratches,
out--of--roundness and bending.
3. Inspect head, shaft and piston for excessive pitting,
scoring and wear.
4. Replacelift cylinder if internal components arefound
to be worn or damaged.
Assembly (Fig. 96)
1. Make sure all lift cylinder parts are clean before as-
sembly.
2. Coat new O--rings, back--up washer and other seals
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.
3. Mountshaft securely inavisebyclampingonthecle-
vis of the shaft.
A. Coat shaft with clean hydraulic oil.
B. Slide head onto the shaft.
C. Install piston onto the shaft and secure with lock
nut. Torque lock nut 40 ft--lb (54 N--m).
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.
4. Mount barrel securely in a vise by clamping on the
clevis end of the barrel.
IMPORTANT: When installing the head into the bar-
rel, pay careful attention to the retaining ring slot in
thebarreltoinsurethatthepistonandheadsealsdo
not lodge in the slot.
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.
6. Secure head in barrel with retaining ring.
A. Align retaining ring hole in the head with the ac-
cess slot in the barrel.
B. Insert the r etaining 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.
C. Apply silicone sealer to barrel access slot.
Hydraulic
System