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Reelmaster 3550−D Hydraulic SystemPage 4 − 125
Disassembly (Fig. 79)
1. Remove oil from the 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
cylinder in a vise; clamp on the clevis 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. 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. Remove plugs from ports. Extract rod, head and pis-
ton assembly from barrel by carefully twisting and pull-
ing on the rod.
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 from the rod. Slide piston
and head off the rod.
6. Remove seals, back−up rings and O−rings from the
piston and head.
Assembly (Fig. 79)
1. Make sure all lift cylinder components are clean be-
fore assembly.
2. Coat new O−rings, seals and back−up ring with
clean hydraulic oil.
A. Install Uni−ring and O−ring to the piston.
B. Install O−rings, back−up ring and rod seal to the
cylinder gland.
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 a light coat of clean hydraulic oil.
B. Carefully slide head assembly and then piston
assembly onto the rod. Install lock nut onto the rod
and torque nut 40 ft−lb (54 N−m).
C. Remove rod assembly from the vise.
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 to not damage the seals.
IMPORTANT: Prevent damage when clamping the
cylinder’s barrel into a vise; clamp on the clevis
only.
5. Mount lift cylinder in a vise with soft jaws. Secure
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