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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 147
Disassembly (Fig. 125)
1. Removeoil fromlift cylinder intoa drainpan by slowly
pumping the cylinder shaft. Plug both ports and clean
the outside of the cylinder.
IMPORTANT: Prevent damage when clamping the
cylinder in a vise; clamp on the clevis only. Do not
close vise enough to distort the barrel.
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. Loosen head from barrel:
A. Use a spanner wrench to rotate head clockwise
until the edge of the retaining ring appears in the bar-
rel opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
C. Rotate the head counter--clockwise to remove re-
taining r ing from barrel and head.
4. Extract shaft with head and piston by carefully twist-
ing and pulling on the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vise.
5. Mount shaft securely in avise by clamping on the cle-
vis of the shaft. Remove lock nut and piston from the
shaft. Slide head off the shaft.
6. Remove and discard all seals and O--rings from the
piston and the head.
7. Wash parts in clean solvent. Dry parts with com-
pressed air. Do not wipe parts dry with paper towels or
cloth. Lint in a hydraulic system will cause damage.
8. Carefully inspect internal surface of barrel for dam-
age (deep scratches, out--of--round, etc.). Replace en-
tire cylinder if barrel is damaged. Inspect piston rod and
piston for evidence of excessive scoring, pitting or wear.
Replace any damaged parts.
Assembly (Fig. 125)
1. Make sure all cylinder components are clean before
assembly.
2. Coat new seal kit components with clean hydraulic
oil.
A. Install new seals and O--rings to the piston.
B. Install new seals, O--ring and back--up seal to the
head.
3. Coat shaft with clean hydraulic oil. Carefully slide
head and piston onto the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
inginavise.
4. Mountshaft securely in avise by clamping on the cle-
vis of the shaft. Secure piston to shaft with lock nut.
A. If rod diameter is 0.630” (16 mm), torque lock nut
from 30 to 35 ft-- lb (41 to 47 N --m).
B. If rod diameter is 0.750” (19 mm), torque lock nut
from 60 to 70 ft-- lb (82 to 94 N --m).
5. Lubricate head and piston with hydraulic oil. Careful-
ly slide shaft assembly into cylinder barrel.
IMPORTANT: Prevent damage when clamping the
cylinder ’s barrel into a vise; clamp on the clevis
only. Do not close vise enough to distort the barrel.
6. Mount lift cylinder in a vise with soft jaws. Secure
head in barrel:
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 r etaining ring is com-
pletely pulled into the barrel and the ring ends are
covered.
C. Apply silicone sealer to barrel access slot.
Hydraulic
System