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Rev. E
Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 107
Disassembly
1. Pump oil out of cylinder into a drain pan by SLOWLY
moving rod and piston in and out of cylinder bore. Plug
ports and clean outside of cylinder.
IMPORTANT: To prevent damage when clamping
cylinder barrel or rod in a vise, clamp only on pivotal
ends. Use of a vise with soft jaws is recommended.
2. Mount cylinder in a vise so piston rod end of cylinder
is tilted up slightly. Do not close vise so firmly that cylin-
der tube could become distorted.
3. Loosen gland (head) from barrel:
A. On cylinders without a r etaining ring slot in the
barrel (Fig. 82), use a spanner wrench to loosen and
remove gland from barrel.
B. On cylinders with a retaining ring (Fig. 83), 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.
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.
IMPORTANT: Do not clamp vise jaws against
smooth piston rod surface; the piston rod will be-
come damaged.
5. Securely mount piston, piston rod, and gland into
vise and remove lock nut. Remove piston and gland
from rod.
6. Remove all seals and O--rings.
7. Wash parts in clean solvent. Dry parts with com-
pressed air. D o 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
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.
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
and piston onto shaft. Install and tighten lock nut.
4. Put a coating of clean hydraulic oil on all cylinder
parts to ease assembly.
5. Slide piston rod assembly into cylinder tube.
6. Mount lift cylinder in a v ise with soft jaws. Secure
gland (head) in barrel:
A. On cylinders without a r etaining ring slot in the
barrel (Fig. 82), use a spanner wrench to tighten
gland into barrel.
B. On cylinders with a r etaining ring (Fig. 83), 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.
1. Barrel
2. Gland (head)
3. Retaining ring
Figure 83
1
3
2
Hydraulic
System