Disassembly (Fig. 111)
Removeoilfromliftcylinderintoadrainpanbyslowly
pumping the cylinder shaft. Plug both ports and clean
the outside of the cylinder.
Assembly (Fig. 111)
1.
1. Make sure all cylinder components are clean before
assembly.
2.
Coat new seal kit components with clean hydraulic
IMPORTANT: Prevent damage when clamping the
cylinder in a vise; clamp on the clevis only. Do not
close vise enough to distort the barrel.
oil.
A. Install new seals and O--rings to the piston.
B. Install new seals, O--ring and back--up seal to the
head.
2.
the clevis end of the barrel. Use of a vise with soft jaws
is recommended.
Mount lift cylinder securely in a vise by clamping on
3.
Coat shaft with clean hydraulic oil. Carefully slide
head and piston onto the shaft.
3.
Loosen head from barrel:
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vise.
A. Use a spanner wrench to rotate head clockwise
until the edge ofthe retaining ring appears in the bar-
rel opening.
4.
vis of the shaft. Secure piston to shaft with lock nut.
Mountshaftsecurelyinavisebyclampingonthecle-
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
A. If rod diameter is 0.630” (16 mm), torque lock nut
from 30 to 35 ft--lb (41 to 47 N--m).
C. Rotatetheheadcounter--clockwisetoremovere-
taining ring from barrel and head.
B. If rod diameter is 0.750” (19 mm), torque lock nut
from 60 to 70 ft--lb (82 to 94 N--m).
4.
Extract shaft with head and piston by carefully twist-
ing and pulling on the shaft.
5.
Lubricate head and piston withhydraulic oil.Careful-
ly slide shaft assembly into cylinder barrel.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vise.
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.
5.
Mountshaftsecurelyinavisebyclampingonthecle-
vis of the shaft. Remove lock nut and piston from the
shaft. Slide head off the shaft.
6.
head in barrel:
Mount lift cylinder in a vise with soft jaws. Secure
6.
piston and the head.
Remove and discard all seals and O--rings from the
A. Align retaining ring hole in the head with the ac-
cess slot in the barrel.
7.
pressed air. Do not wipe parts dry with paper towels or
cloth. Lint in a hydraulic system will cause damage.
Wash parts in clean solvent. Dry parts with com-
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.
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 ofexcessive scoring, pitting or wear.
Replace any damaged parts.
C. Apply silicone sealer to barrel access slot.
Groundsmaster 4500--D/4700--D
Page 4 -- 133
Hydraulic System
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| Language | English |
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