Toro Groundsmaster 4500-D Series Service Manual page 276

Disassembly (Figure
Assembly (Figure 157)
Hydraulic System: Service and Repairs
157) (continued)
Prevent damage when clamping the cylinder in a vise; clamp on the
clevis only. Do not close vise enough to distort the barrel.
2. Mount lift cylinder securely in a vise by clamping on the clevis end of the
barrel. Use of a vise with soft jaws is recommended.
3. Loosen head from barrel:
A. Use a spanner wrench to rotate head clockwise until the edge of the
retaining ring appears in the barrel opening.
B. Insert a screwdriver under the beveled edge of the retaining ring to start
the retaining ring through the opening.
C. Rotate the head counter-clockwise to remove retaining ring from barrel
and head.
4. Extract shaft with head and piston by carefully twisting and pulling on the
shaft.
Do not clamp vise jaws against the shaft surface. Protect shaft
surface before mounting in a vise.
5. Mount shaft securely in a vise by clamping on the clevis of the shaft. Remove
lock nut and piston from the shaft. Slide head off the shaft.
6. Remove and discard all seals and O-rings from the piston and the head.
7. Wash parts in clean solvent. Dry parts with compressed air. Do 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 damage (deep scratches,
out-of-round, etc.). Replace entire cylinder if barrel is damaged. Inspect
piston rod and piston for evidence of excessive scoring, pitting or wear.
Replace any damaged parts.
1. Make sure all cylinder components are clean before assembly.
2. Coat new seal kit components with clean hydraulic oil.
A. Install new seals and O-rings to the piston.
B. Install new seals, O-ring and back-up seal to the head.
3. Coat shaft with clean hydraulic oil. Carefully slide head and piston onto the
shaft.
Do not clamp vise jaws against the shaft surface. Protect shaft
surface before mounting in a vise.
4. Mount shaft securely in a vise by clamping on the clevis of the shaft. Secure
piston to shaft with lock nut.
IMPORTANT
IMPORTANT
IMPORTANT
Page 5–174 Groundsmaster ® 4500-D/4700-D
19245SL Rev A