caution - Toro

Disassembly (Fig. 68)
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 in a vise so rod end of cylinder 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 the retaining ring appears in the tube
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 tube and head.
4. Grasp end of piston rod and use a twisting and pulling
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 become damaged.
5. Securely mount piston, piston rod and head into vise
and remove piston. Remove head from rod.
6. Remove and discard all seals and O--rings from
head and piston.
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 rod and piston
for evidence of excessive scoring, pitting or wear. Replace
any damaged parts.
Assembly (Fig. 68)
1. Use a complete repair kit when rebuilding the cylinder.
Put a coating of clean hydraulic oil on all new seals
and O--rings.
2. Install new O--rings and seals to the piston and head.
3. Lubricate shaft with clean hydraulic oil. Slide head
onto shaft. Install and tighten head. Torque head from 45
to 55 ft -lb (62 to 74 N -m).
4. Put a coating of clean hydraulic oil on all cylinder
parts to ease assembly.
5. Slide rod assembly into cylinder tube.
6. Mount steering cylinder in a vise with soft jaws. Secure
head in barrel:
A. Align retaining ring hole in the head with the access
slot in the tube.
B. Insert the retaining ring hook into the hole and rotate
head clockwise until the retaining ring is completely
pulled into the tube and the ring ends are
covered.
C. Apply silicone sealer to tube access slot.
Hydraulic
System
Groundsmaster 4100--D
Page 4 - 101
Hydraulic System