Disassembly (Fig. 78)
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.
Assembly (Fig. 78)
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
cylinder in a vise, clamp only on pivotal ends. Use
of a vise with soft jaws is recommended.
2. InstallnewO--ringsandsealstothepistonandhead.
3.
Lubricate shaft with clean hydraulic oil. Slide head
onto shaft.
2.
up slightly. Do not close vise so firmly that cylinder tube
could become distorted.
Mountcylinder inaviseso rodend ofcylinder istilted
4.
from 45 to 55 ft--lb (62 to 74 N--m).
Install and tighten piston onto shaft. Torque piston
5.
install set screws into piston. Torque set screws from 5
to 7 ft--lb (7 to 9 N--m).
Apply Loctite #242 (or equivalent) to set screws and
3.
Loosen head from tube:
A. Use a spanner wrench to rotate head clockwise
untiltheedgeoftheretainingringappearsinthetube
opening.
6.
parts to ease assembly.
Put a coating of clean hydraulic oil on all cylinder
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
7.
8.
Slide rod assembly into cylinder tube.
Mount steering cylinder in a vise with soft jaws. Se-
cure head in barrel:
C. Rotatetheheadcounter--clockwisetoremovere-
taining ring from tube and head.
A. Align retaining ring hole in the head with the ac-
cess slot in the tube.
4.
ing motion to carefully extract piston, piston rod and
head from cylinder tube.
Grasp end of piston rod and use a twisting and pull-
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.
IMPORTANT: Do not clamp vise jaws against piston
rod surface; the piston rod will be damaged.
C. Apply silicone sealer to tube access slot.
5.
Securely mount piston, piston rod and head assem-
bly into vise with soft jaws.
6.
Remove piston frompiston rodand thenslide headfrom
rod.
Remove set screws that secure piston to piston rod.
7.
Remove and discard all seals and O--rings 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 tube for damage
(deep scratches, out--of--round, etc.). Inspect rod and
piston for evidence ofexcessive scoring, pitting or wear.
Replace cylinder if internal damage or wear is found.
Groundsmaster 4100--D/4110--D
Page 4 -- 115
Hydraulic System
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| Language | English |
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