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Pro Sweep Hydraulic SystemPage 3 -- 39
Disassembly (Fig. 25)
1. Remove oil from offset 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 offset cylinder securely in a vise by clamping
on the clevis end of the tube. Use of a vise with soft jaws
is recommended.
3. Loosen head from tube:
A. Use a spanner wrench to rotate head clockwise
until the edge oftheretaining ring appears in the tube
opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the tube opening.
C. Rotatetheheadcounter--clockwise to remove re-
taining ring from tube and head.
4. Extract rod with head and piston by carefully twisting
and pulling on the shaft.
IMPORTANT: Do not clamp vise jaws against the
rod surface.
5. Mount rod assembly securely in a vise by clamping
on the clevis oftherod.Remove lock nut and pistonfrom
the rod. Slide head off the rod.
IMPORTANT: When removing seal components, be
careful to not scratch or damage piston or head.
6. Removeanddiscardallsealkitcomponentsfromthe
piston and the head.
CAUTION
Use eye protection such as goggles when using
compressed air
7. Wash all 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 tube for damage
(deep scratches, out--of--round, etc.). Inspect rod and
piston for evidence of excessive scoring, pitting or wear.
Replace offset cylinder if internal componentsare found
to be worn or damaged.
Assembly (Fig. 25)
1. Make sure all cylinder components are thoroughly
cleaned before assembly.
2. Coat new seal kit components with clean hydraulic
oil.
IMPORTANT: When installing seal components to
piston and head, be careful to not scratch or dam-
age piston or head.
A. Install new seals and O--rings 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.
3. Mount rod securely in a vise by clamping on the cle-
vis of the rod.
A. Coat shaft with clean hydraulic oil.
B. Carefully slide head and piston onto the rod. Se-
cure piston to shaft with lock nut.
C. Torque lock nut from 30 to 35 ft--lb (41 to 47
N--m).
IMPORTANT: When installing the head into the
tube, pay careful attention to t he retaining ring slot
in the tube to ensure that the backup ring does not
lodge in the slot.
4. Lubricate head and piston with clean hydraulic oil.
Carefully slide shaft assembly into cylinder tube.
IMPORTANT: Prevent damage when clamping the
cylinder’s tube in a vise; clamp on the clevis only.
5. Mount offset cylinder in a vise with soft jaws. Secure
head in tube:
A. Align retaining ring hole in the head with the ac-
cess slot in the tube.
B. Insert the retaining ring hook into the hole and ro-
tate head clockwise until the retaining ring is com-
pletely pulled into the tube and the ring ends are
covered.
C. Apply silicone sealer to tube access slot.
Hydraulic
System