Autoquip PLTC DOCK LIFT - Manual (Page 47)

47
CYLINDER REPACKING (Reference Figure 22)
1. Remove the cylinder as described above in Cylinder Removal.
2. Pull the rod out of the cylinder tube sufficiently to gain access to the ‘face
spanner wrench holes’ on the rod end of the cylinder. Do not allow oil or dirt
to be pulled back into the hydraulic hose.
3. Using a Spanner wrench and turn the bearing assembly clockwise until the
tip of the retainer appears in the slot, in the outer surface of the cylinder tube.
4. Insert a small blade screwdriver under the tip of the retainer and turn the
bearing assembly counter-clockwise until the retainer is removed from the slot..
NOTE: The wire retainer may be a cutting or puncturing hazard.
5. Pull the rod out of the tube slowly to remove the rod and bearing assembly.
NOTE: Use caution to prevent surface damage to the rod. This could result
in seal failure and/or leakage.
6. After all the internal components have been removed, use a bright light to inspect
the inner walls of the cylinder barrel. Use a cylinder hone if necessary to remove
any apparent nicks or scratches. Clean and flush the barrel thoroughly after
honing to remove chips and grit.
7. Remove the piston lock nut and slide off the piston and bearing assembly.
Take care to protect the rod surface from damage. The upper clevis and pin may
be used to prevent rotation of the rod while loosening.
8. Inspect all piston grooves and seal surfaces for any imperfections and repair or
replace as necessary. Install new packing and seals on the piston, rod, and
bearing assembly.
9. Liberally lubricate the piston and seals with CLEAN grease or oil. Install the
seal and piston on the rod assembly. Install the Rod Lock Nut on the rod and
torque the Lock Nut to: 325 ft. lbs. on (3.5" Bore) & (4" Bore) cylinders.
On (5" Bore Cylinders, torque the Rod Lock Nut to 300 ft. lbs. The upper
trunnion clevis and pin may be used to prevent the rotation of the rod while
tightening.
10. Install the rod and piston into the cylinder casing tube using care not to damage
any seals or packing.
11. Slip the bearing assembly into place
.
Align the retainer hole in the bearing
assembly groove with the slot in the tube.
12. Insert the retainer hook end in the hole/slot and using a face spanner wrench.
Turn the bearing assembly clockwise until the retainer is completely inserted in
the groove/slot in the tube.
GENERAL MAINTENANCE