Toro Groundsmaster 4500-D Service Manual page 187

Disassembly (Fig. 125)
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
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 bar-
rel 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 re-
taining ring from barrel and head.
4. Extract shaft with head and piston by carefully twist-
ing and pulling on the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vise.
5. 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.
6. Remove and discard all seals and O--rings from the
piston and the head.
7. 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.
8. Carefully inspect internal surface of barrel for dam-
age (deep scratches, out--of--round, etc.). Replace en-
tire cylinder if barrel is damaged. Inspect piston rod and
piston for evidence of excessive scoring, pitting or wear.
Replace any damaged parts.
Groundsmaster 4500--D/4700--D
Assembly (Fig. 125)
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.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vise.
4. Mount shaft securely in a vise by clamping on the cle-
vis of the shaft. Secure piston to shaft with lock nut.
A. If rod diameter is 0.630" (16 mm), torque lock nut
from 30 to 35 ft- -lb (41 to 47 N- -m).
B. If rod diameter is 0.750" (19 mm), torque lock nut
from 60 to 70 ft- -lb (82 to 94 N- -m).
5. Lubricate head and piston with hydraulic oil. Careful-
ly slide shaft assembly into cylinder barrel.
IMPORTANT: Prevent damage when clamping the
cylinder's barrel into a vise; clamp on the clevis
only. Do not close vise enough to distort the barrel.
6. Mount lift cylinder in a vise with soft jaws. Secure
head in barrel:
A. Align retaining ring hole in the head with the ac-
cess slot in the barrel.
B. Insert the retaining ring hook into the hole and ro-
tate head clockwise until the retaining ring is com-
pletely pulled into the barrel and the ring ends are
covered.
C. Apply silicone sealer to barrel access slot.
Page 4 - - 147 Hydraulic System