Groundsmaster 3500--D Hydraulic System (Rev. D)Page 4 -- 117
Disassembly
1. Remove oil from lift cylinder into a drain pan by slowly
pumping the cylinder shaft. Plug both ports and clean
the outside of the cylinder.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on the clevis
only.
2. Mount lift cylinder in a vice. Remove internal collar
with a spanner wrench.
3. Remove plugs from ports. Extract shaft, head, and
piston by carefully twisting and pulling o n the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vice.
4. Mount shaft s ecurely in a vise by clamping on the cle-
vis of the shaft. Remove lock nut and piston from the
shaft. Slide head off the shaft.
5. Remove Uni--ring and o--ring from the piston. Re-
move o--ring, back--up ring, rod seal, and dust seal from
the head.
Assembly
1. Make sure all parts are clean before assembly.
2. Coat new o--rings, Uni--ring, rod seal, back--up ring,
and dust seal with with clean hydraulic oil.
A. Install Uni--ring and o--ring to the piston.
B. Install rod seal, o--ring, back--up ring, and dust
seal to the head.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vice.
3. Mount shaft s ecurely in a vise by clamping on the cle-
vis of the shaft.
A. Coat shaft with with clean hydraulic oil.
B. Slide head onto the shaft. Install rod seal onto
shaft and into head.
C. Install piston and nut onto the shaft. Torque nut
from 24 to 30 ft--lb (33 to 41 N--m).
D. Remove shaft from the vise.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on the clevis
only.
4. Mount barrel in a vice.
5. Coat all internal parts with a light coat of clean hy-
draulic oil. Slide piston, shaft, and head assembly into
the barrel being careful not to damage the seals.
6. Secure head in the barrel with internal collar using a
spanner wrench. Tighten collar until snug and the outer
end of the c ollar is flush with end of the barrel.
7. If clevis was removed from cylinder shaft, fully retract
cylinder shaft and thread jam nut and clevis onto shaft.
Adjust center to center length to dimension shown in
Figure 85 before tightening jam nut.
Figure 85
10.125” to 10.500”
(25.72 to 26.67 cm)
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