Disassembly (Fig. 84)
Remove oil from lift cylinder by slowly pumping the
cylinder shaft.Afterremovingoilfromcylinder,plugboth
ports and clean the outside of the cylinder.
Assembly (Fig. 84)
1.
1. Use a complete repair kit when rebuilding the cylin-
der. Put a coating of clean hydraulic oil on all new seals,
and O--rings.
IMPORTANT: To prevent damage when clamping
cylinderbarrelorrodinavise,clamponly onpivotal
ends. Use of a vise with soft jaws is recommended.
2. Install new O--rings and PTFE seal to the piston rod
and new O--ring, U--cup, and wiper to gland.
3.
Lubricate shaft with clean hydraulic oil. Slide gland
2.
is tilted up slightly. Do not close vise so firmly that cylin-
der tube could become distorted.
Mount cylinder in a vise so piston rod end of cylinder
and piston onto shaft. Install and tighten locking nut.
4.
Put a coating of clean hydraulic oil on all cylinder
parts to ease assembly.
3.
Loosen gland (head) from barrel:
5.
6.
Slide piston rod assembly into cylinder tube.
A. On cylinders without a retaining ring slot in the
barrel (Fig. 84), use a spanner wrench to loosen and
remove gland from barrel.
Mount lift cylinder in a vise with soft jaws. Secure
gland (head) in barrel:
A. On cylinders without a retaining ring slot in the
barrel (Fig. 84), use a spanner wrench to tighten
gland into barrel.
B. On cylinders with a retaining ring (Fig. 85), use a
spanner wrench to rotate head clockwise until the
edge of the retaining ring appears in the barrel open-
ing. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening. Rotate the head counter--clockwise to
remove retaining ring from barrel and head.
B. On cylinders with a retaining ring (Fig. 85), align
retaining ring hole in the head with the access slot in
the barrel. Insert the retaining ring hook into the hole
and rotate head clockwise until the retaining ring is
completely pulled into the barrel and the ring ends
are covered.
4.
Grasp end of piston rod and use a twisting and pull-
ing motion to carefully extract piston, piston rod, and
gland from cylinder tube.
1
IMPORTANT: Do not clamp vise jaws against
smooth piston rod surface; the piston rod will be-
come damaged.
5.
vise and remove nut. Remove piston and gland from
rod.
Securely mount piston, piston rod, and gland into
6.
7.
pressed air. Do not wipe parts dry with paper towels or
cloth. Lint in a hydraulic system will cause damage.
Remove all seals and O--rings.
Wash parts in clean solvent. Dry parts with com-
3
2
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.
Figure 85
1.
2.
Barrel
Gland (head)
3.
Retaining ring
Groundsmaster 4100--D
Page 4 -- 109 Rev. E
Hydraulic System
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