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MAN0556 (9/21/2007)
Dealer Service 27
With all of the seals installed, slide the rod guide
assembly (5) onto rod (1).
Install crown piston seal (3J) onto piston (6). Install off-
set rings (3H) on both sides of the crown piston seal
(3J) in the large groove on the piston (6). The profile of
the offset ring (3B) should mate with the lip on the
crown piston seal (3J). Place the “L” shaped guide ring
(3G) on the outside of each offset ring (3H). Boom cyl-
inders require two additional wear rings (3K) to be
installed in the two smaller grooves on the piston (6).
Bucket cylinders have one wear ring.
Lightly coat rod threads with hydraulic oil and slide O-
ring (3A) over threads and into groove. Completely
clean threads of hydraulic oil, apply Liquid Primer 7649
and Loctite 242 to the rod threads, and thread piston
(6) onto rod (1) with the two holes in the piston orien-
tated away from the rod. Torque the piston (6) to 160
lbs-ft.
Compress wear rings and piston seals and carefully
insert piston and rod assembly into barrel. Use care to
prevent damage while installing. Carefully screw rod
guide (5) into barrel (8) using a spanner wrench, or
carefully use a punch and hammer.
Figure 31. Bucket Cylinders
1. Piston rod
3A. O-Ring
3B. Wiper ring
3C. Rod seal
3D. Back-up ring
3E. O-Ring
3F. Rod guide ring
3G. Guard ring
3H. Offset ring
3J. Crown piston seal
3K. Wear ring
5. Rod guide assembly
6. Piston
8. Cylinder barrel