Service Manual

Rev. E
Groundsmaster 4100--D Hydraulic SystemPage 4 -- 101
Disassembly (Fig. 79)
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’s barrel into a vise; clamp on the clevis
only. Do not close vise enough to distort the barrel.
2. Mount lift cylinder into a vise. Use of a vise with soft
jaws is recommended.
3. Remove retaining r ing that secures head in 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 r emove re-
taining ring from barrel and head.
4. Extract shaft with head and piston by carefully twist-
ing and pulling o n 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 c le-
vis of the shaft. Remove lock nut and piston from the
shaft. Slide head off the shaft.
6. Remove T--seal, o--ring, and wear ring from the pis-
ton. Remove O--ring, back--up ring, rod seal, and dust
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 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. 79)
1. Make sure all parts are clean before reassembly.
2. Coat new O--rings, T--seal, wear ring, rod seal,
back-- up ring, and dust seal with clean hydraulic oil.
A. Install T--seal, wear ring, and O--ring to the piston.
B. Install dust seal, O--ring, back--up ring, and dust
seal to the head.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vise.
3. Mount shaft securely in a vise by clamping on the c le-
vis of the shaft.
A. Coat shaft with clean hydraulic oil.
B. Slide head and piston onto the shaft. Secure pis-
ton to shaft with locknut.
4. Lubricate head and piston with hydraulic oil. Slide
shaft assembly carefully 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.
5. Mount lift cylinder into a vise. 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