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Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 117
Disassembly (Fig. 88)
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 in a vise, clamp only on pivotal ends. Use
of a vise with soft jaws is recommended.
2. Mount cylinder ina vise sorod end ofcylinder is tilted
up slightly. Do not close vise so firmly that cylinder tube
could become distorted.
3. Loosen head from tube:
A. Use a spanner wrench to rotate head clockwise
until the edge of theretaining ringappears inthe tube
opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
C. Rotatethe head counter--clockwise to remove re-
taining ring from tube and head.
4. Grasp end of piston rod and use a twisting and pull-
ing motion to carefully extract piston, piston rod and
head from cylinder tube.
IMPORTANT: Do not clamp vise jaws against piston
rod surface; the piston rod will be damaged.
5. Securely mount piston, piston rod and head assem-
bly into vise with soft jaws.
6. Remove set screws that secure piston to piston rod.
Remove piston frompiston rod andthen slide headfrom
rod.
7. Remove and discard all seals and O--r ings from
head and piston.
CAUTION
Use eye protection such as goggles when using
compressed air to dry cylinder components.
8. 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.
9. Carefully inspect internal surface of barrel for dam-
age (deep scratches, out--of--round, etc.). Replace en-
tire cylinder if barrel is damaged. Inspect rod and piston
for evidence of excessive scoring, pitting or wear. Re-
place any damaged parts.
Assembly (Fig. 88)
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 seals tothepiston and head.
3. Lubricate shaft with clean hydraulic oil. Slide head
onto shaft.
4. Install and tighten piston onto shaft. Torque piston
from 45 to 55 ft--lb (62 to 74 N--m).
5. Apply Loctite #242 (or equivalent) to set screws and
install set screws into piston. Torque set screws from 5
to 7 ft--lb (7 to 9 N--m).
6. Put a coating of clean hydraulic oil on all cylinder
parts to ease assembly.
7. Slide rod assembly into cylinder tube.
IMPORTANT: To prevent damage when clamping
cylinder in a vise, clamp only on pivotal ends. Use
of a vise with soft jaws is recommended.
8. Mount steering cylinder in a vise with soft jaws. Se-
cure head in barrel:
A. Align retaining ring hole in the head with the ac-
cess slot in the tube.
B. Insert the retaining ring hook into the hole and ro-
tate head clockwise until the retaining ring is com-
pletely pulled into the tube and the ring ends are
covered.
C. Apply silicone sealer to tube access slot.
Hydraulic
System