Figure 2-20. Three seal cylinder head.

Figure 2-21. Removing cylinder head shims.

(a) Place retainer (3, fig. 2-22) on rod

(6). Separate and oil all the rings of packing (2).

Place the packing on the rod so the open part of the

V will be facing toward head (1) when the head is

installed. Be sure rubber pressure ring (4) is located

as shown.

Figure 2-20. Three seal cylinder head.

(e) Cylinder head packing adjustment.

1. Oil leakage between the rod and the

hydraulic cylinder packing can be the result of

w o r n , cut, and/or distorted packing. Leakage can

o f t e n be stopped by removing shims (2, fig. 2-21)

located between retainer (1) and the cylinder head;

this will allow the packing to be compressed against

t h e rod when the retainer is tightened.

2 . Remove the bolts securing retainer to

the cylinder head. Move the retainer away from the

cylinder head to allow the shims to be cut and

removed.

3 . Remove one shim (2); install retainer

(1) and operate the cylinder. If leakage is still

apparent, repeat the procedure. If the cylinder

leaks after removing two shims, remove and

d i s a s s e m b l e the cylinder and replace the packing.

Figure 2-22. Packing and shims installed.