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Lift Cylinder Repair – No. 1 (Center) (Fig. 34)
Figure 34
IMPORTANT: To prevent damage when clamping the
cylinder barrel in a vise, clamp only on the pivot end.
Do not clamp the vise jaws against the smooth shaft
surface. Protect the shaft surface before mounting
in the vise.
1. After removing the cylinder, pump the oil out of the
cylinder into a drain pan by SLOWLY moving the cylin-
der’s piston in and out of the cylinder bore.
2. Plug the ports and clean the outside of the cylinder.
3. Mount the cylinder in a vise so the shaft end of the
cylinder is tilted up slightly. Do not close the vise so
firmly that the barrel could become distorted.
4. Remove the retaining ring (Item 10). Grasp clevis end
of shaft (Item 11) and use a twisting and pulling motion
to carefully extract piston (Item 4), shaft (Item 11), and
head (Item 8) from the barrel (Item 1).
5. Securely mount the shaft (Item 11) in a vise and
remove the lock nut (Item 2) from the piston end of the
shaft. Remove the piston (Item 4). Slide the head
(Item 8) off of the shaft.
6. Remove and discard all seals and back-up rings
(Items 3, 5, 6, 7, 9).
7. Wash the parts in a safe solvent. Dry the parts with
compressed air. DO NOT wipe them dry with a cloth or
paper as lint and dirt may remain.
8. Inspect the internal surface of the barrel (Item 1) for
damage (deep scratches, out-of-round, etc.). Inspect
the head (Item 8), shaft (Item 11) and piston (Item 4) for
evidence of excessive scoring, pitting, or wear. Replace
any defective parts.
9. Put a light coating of hydraulic oil on all new seals and
back-up washers. Install the new seals and back-up
washers (Items 3, 5, 6, 7, 9). Install the head (Item 8)
onto the shaft (Item 11). Install the piston (Item 4) onto
the shaft and tighten the lock nut (Item 2).
10. Put a light coating of hydraulic oil on all cylinder parts
to ease assembly. Slide the shaft assembly and head
into the barrel. Install the retaining ring (Item 10) to
secure the assembly in the barrel.
Repairs Page 4 - 52 Greensmaster
®
3100