Toro Reelmaster 7000, Service Manual

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Reelmaster 7000 Hydraulic System Page 4 -- 109
Disassembly (Fig. 81)
1. Remove oil from steering 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 steering cylinder securely in a vise by clamp-
ing 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 rod with head and piston by carefully twisting
and pulling on the rod.
IMPORTANT: Do not clamp vise jaws against the
rod surface. Protect rod surface before mounting in
a vise.
5. Mount shaft securely in a vise by clamping on the cle-
vis of the rod. Remove lock nut and piston from the rod.
Slide head off the rod.
6. For assembly purposes, note location and orienta-
tion of all seals and O--rings on piston and head. Re-
move and discard all seals and O--rings from the piston
and the head.
7. Wash cylinder 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 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.
Assembly (Fig. 81)
1. Make sure all cylinder components are clean before
assembly.
2. Coat new seal kit components with clean hydraulic
oil.
A. Install new seals, O--ring and wear band to the
piston.
B. Install new seals, O--ring and back--up ring to the
head.
IMPORTANT: Do not clamp vise jaws against the
rod surface. Protect rod surface before mounting in
a vise.
3. Mount rod securely in a vise by clamping on the cle-
vis of the rod.
A. Coat rod with clean hydraulic oil.
B. Carefully slide head and piston onto the rod.
C. Clean threads on end of rod. Apply Loctite #271
(or equivalent) to rod threads.
D. Secure piston to rod with lock nut. Torque lock nut
from 50 to 60 ft--lb (68 to 81 N--m) .
IMPORTANT: When installing the rod assembly into
the barrel, 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.
4. Coat all internal parts with a light coat of clean hy-
draulic oil. Slide piston, rod and head assembly into the
barrel being careful not to damage the seals.
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.
5. Mount steering cylinder in a vise with soft jaws. Se-
cure 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.
Hydraulic System