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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 109
Disassembly (Fig. 90)
1. Remove oilfrom steeringcylinder into adrain pan by
slowly pumping the cylinder shaft. Plug both ports and
clean the outside of the cylinder.
IMPORTANT: Prevent damage when clamping t he
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 endof the barrel. Use ofa vise with soft
jaws is recommended.
3. Loosen head from barrel:
A. Use a spanner wrench to rotate head clockwise
until theedge ofthe retainingring appearsin thebar-
rel opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
C. Rotatethe headcounter--clockwisetoremove 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. Mountshaft securelyinaviseby clampingonthecle-
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 forevidence ofexcessive scoring,pitting orwear.
Replace any damaged parts.
Assembly (Fig. 90)
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 newseals, O --ring and back--up seal tothe
head.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vise.
3. Mountshaft securelyinaviseby clampingonthecle-
vis of the shaft.
A. Coat shaft with clean hydraulic oil.
B. Carefully slide head and piston onto the shaft.
Secure piston to shaft with lock nut.
C. Torque lock nut from 30 to 36 ft--lb (41 to 48
N--m).
4. Lubricatehead andpiston withhydraulic oil.Careful-
ly slide shaft assembly into cylinder barrel.
IMPORTANT: Prevent damage when clamping t he
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 theretaining ring hook into thehole 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