Toro Groundsmaster 3500 30807, Руководство по обслуживанию

Страница: 191 / 283

Groundsmaster 3500 Hydraulic System Page 5 − 133
Disassembly
1. Remove hydraulic fluid 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 on the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vice.
4. Mount shaft securely 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.
Inspection
Carefully inspect internal surface of cylinder barrel for
damage (deep scratches, out−of−round, etc.). Inspect
piston rod for straightness, excessive scoring, and pit-
ting or wear. Inspect piston and head for evidence of ex-
cessive scoring and pitting or wear. Replace entire
cylinder assembly if necessary.
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 fluid.
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 securely in a vise by clamping on the cle-
vis of the shaft.
A. Coat shaft with with clean hydraulic fluid.
B. Slide head onto the shaft. Install rod seal onto
shaft and into head.
C. Install piston and lock nut onto the shaft. Torque
nut from 40 ft−lb (54 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 fluid. 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 collar 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 be-
fore tightening jam nut (Fig. 90).
Figure 90
10.250” to 10.625”
(26.04 to 26.98 cm)
Hydraulic
System