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Groundsmaster 5900/5910 Hydraulic SystemPage 4 -- 119
Disassembly (Fig. 87)
1. Removeoil from lift cylinderintoadrainpan by slowly
pumping the cylinder shaft. Plug both ports and clean
the outside of the cylinder.
IMPORTANT: Prevent damage when clamping t he
cylinder’s barrel into a vise; clamp on the clevis
only. Do not close vise on barrel.
2. Mount lift cylinder in a vise equipped with soft jaws
by clamping on the barrel clevis.
3. Remove retaining r ing that secures head in barrel.
A. Use a spanner wrench to r otate head clockwise
until theedge 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--clockwisetoremovere-
taining ring from barrel and head.
4. Extract shaft with head and piston by carefully twist-
ing and pulling on the shaft.
IMPORTANT: When securing shaft invise,clamp on
shaft clevisonly.Do not clamp vise jaws against the
shaft surface.
5. Mountshaftsecurelyinavisebyclampingonthecle-
vis of the shaft. Remove lock nut and piston from the
shaft. Slide head from the shaft.
6. Remove piston seal and O--ring from the piston. Re-
move O--ring, back--up ring, wear ring, dust seal and
shaft seal from 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 the 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 shaft and
piston for evidence of excessive scoring, pitting or wear.
Replace any damaged parts.
Assembly (Fig. 87)
1. Make sure all parts are clean before reassembly.
2. Coat new O--rings, piston seal, wear ring, shaft seal,
back--up ring and dust seal with clean hydraulic oil.
A. Install piston seal and O--ring to the piston.
B. Install back--up ring, O--ring, wear ring, shaft seal
and dust seal to the head.
IMPORTANT: When securing shaft invise,clamp on
shaft clevisonly.Do not clamp vise jaws against the
shaft surface.
3. Mount shaft securely in a vise equipped with soft
jaws by clamping on the shaft clevis.
A. Coat shaft with clean hydraulic oil.
B. Slide head and piston onto the shaft.
C. Secure piston to shaft with lock nut. Torque lock
nut to 130 ft--lb (176 N--m).
4. Lubricate head and piston with clean hydraulic oil.
Slide shaft assembly carefully 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 on barrel.
5. Mount lift cylinder in a vise equipped with soft jaws
by clamping on the barrel clevis.
6. Secure head in barrel with retaining ring.
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.
Hydraulic
System