Toro Groundsmaster 7200 Service Manual page 139

Disassembly (Fig. 112)
1. Remove oil from lift cylinder into a drain pan by slowly
pumping the cylinder rod. Plug both ports and clean the
outside of the cylinder.
IMPORTANT: Prevent damage when clamping the
lift cylinder into a vise; clamp on the clevis end of
the barrel ONLY.
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. Using a spanner wrench, rotate head clockwise until
the edge of the retaining ring appears in the barrel open-
ing. Insert a screwdriver under the beveled edge of the
retaining ring to start the retaining ring through the open-
ing. Rotate the head counter- clockwise to remove re-
taining ring from barrel and head.
4. 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
rod surface. Clamp on the clevis ONLY.
5. Mount rod securely in a vise by clamping on the cle-
vis of the rod. Remove lock nut and piston from the rod.
Carefully slide head off the shaft.
6. Taking care to not scratch or damage the piston, re-
move cap seal and O- ring from the piston. If necessary,
remove wear ring from piston.
7. Taking care to not scratch or damage the head, re-
move O- ring, back- up ring, wiper and seal from the
head.
Inspection
CAUTION
Use eye protection such as goggles when using
compressed air.
1. Wash all lift cylinder components in solvent. Dry
parts with compressed air.
2. Inspect internal surface of barrel for deep scratches,
out- of- roundness and bending. Replace if worn or
damaged.
3. Inspect head, shaft and piston for excessive pitting,
scoring and wear. Replace any worn or damaged parts.
Groundsmaster 7200/7210
Assembly (Fig. 112)
1. Make sure all lift cylinder parts are clean before as-
sembly.
2. Coat new O- rings, back- up ring and other seals with
clean hydraulic oil.
A. Carefully install cap seal and O- ring to the piston.
Install wear ring on piston if removed.
B. Carefully install back- up ring, O- ring, seal and
wiper to the head.
IMPORTANT: Do not clamp vise jaws against the
rod surface. Clamp on the clevis ONLY.
3. Mount rod securely in a vise by clamping on the cle-
vis of the rod.
A. Coat rod with clean hydraulic oil.
B. Slide head onto the rod.
C. Install piston onto the rod and secure with lock
nut. Torque lock nut from 250 to 300 ft- lb (339 to
406 N- m).
D. Remove shaft assembly from the vise.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on the clevis
end of the barrel ONLY.
4. Mount barrel securely in a vise by clamping on the
clevis end of the barrel.
IMPORTANT: When installing the head into the bar-
rel, pay careful attention to the retaining ring slot in
the barrel to insure that the piston and head seals do
not lodge in the slot.
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 barrel by installing retaining ring.
Align retaining ring hole in the head with the access slot
in the barrel. Insert the retaining ring hook into the hole
and rotate head clockwise until the retaining ring is com-
pletely pulled into the barrel and the ring ends are cov-
ered.
Page 4 - 103 Hydraulic System