8006-11
TM 5-2420-230-24-1
Assembly
16. Install a new wear ring (11) in the groove in the
center of the piston (4).
NOTE: Refer to illustration page 10 and 12.
17. Install a new seal (9) in the groove on the outside
1. Install the bushing (15) in the gland (3).
end of the piston (4). The seal (9) must be in the
groove at the end of the piston (4) with the large
2. Install the buffer seal (16) in the gland (3). The
bore.
side of the buffer seal (16) with the lip must be
toward the small end of the gland (3).
18. Install a backup ring (10) over the seal (9) on the
piston (4).
3. Install the wide seal (17) in the gland (3). The
wide seal (17) is to be installed so that the lips of
19. Install the piston ring (12) in the remaining
the wide seal (17) are toward the small end of
groove in the outside of the piston (4).
the gland (3). The wide seal (17) can be difficult
20. Fasten the tube (1) in a vise or other holding
to install. Use the tool shown on page 4.
equipment. Be careful to prevent damage to the
4. Install a new wiper (18) in the gland (3). The lips
tube (1).
of the wiper (18) must be toward the large end of
21. Lubricate the inside of the tube (1) and the piston
the gland (3).
(4) with clean oil.
5. Install a new backup ring (14) in the groove on
22. Push the piston (4) straight into the tube (1).
the outside of the gland (3). If both sides of the
backup ring (14) are not flat, the side that is not
23. When the piston (4) is in the smooth part of the
flat must be toward the small end of the gland
tube (1), start the gland (3) into the tube (1).
(3).
24. Lubricate the O-ring (13) on the gland (3) with
6. Install the O-ring (13) next to the backup ring (14)
clean oil.
in the groove on the outside of the gland (3). The
25. Tighten the gland (3) to 135 to 542 Nm (100 to
O-ring (13) must be toward the small end of the
400 pound-feet). If the lock screw (2) holes
gland (3).
become aligned in this torque range, install the
7. Fasten the piston rod eye (5) in the vise.
lock screw (2). Tighten the lock screw (2) to 2.3
Nm (20 pound-inches). If the lock screw (2) holes
8. Remove any marks and sharp edges on the
are not aligned, do steps 26 through 28.
chamfer at the end of the piston rod (6).
26. Tighten the gland (3) -to 135 to 542 Nm (100 to
9. Lubricate the bore of the gland (3) and the piston
400 pound-feet).
rod (6) with clean oil.
27. Use a No. 26 drill and drill a hole half in the gland
10. Push the gland (3) onto the piston rod (6). If
(3) and half in the tube (1). Drill to a depth of 11
necessary, use a soft hammer to drive the gland
mm (7/16 inch). Do not drill in line with a hole in
(3) onto the piston rod (6).
the gland (3) for the gland wrench.
11. Put a support below and near the end of the
28. Install the lock screw (2). Tighten the lock screw
piston rod (6). Use a shop cloth between the
(2) to 2.3 Nm (20 pound inches).
support and the piston rod (6) to prevent damage
to the piston (4).
29. If the hoses were removed with the cylinder,
install new O-rings, if equipped, on the hose
12. Put the piston (4) on the end of the piston rod (6).
fittings. Lubricate the O-rings with clean oil.
13. Put the hardened washer (8) on the bolt (7).
Install the hoses.
14. Clean the threads on the end of the piston rod
and the threads of the bolt using Loctite cleaning
solvent. Allow to dry. Apply Loctite 243 to the
piston rod threads 6.35 mm (1/4 inch) from the
open end of the piston rod so that there is 12.7
mm (1/2 inch) of Loctite 243 on the piston rod
threads. DO NOT apply Loctite to the first 6.35
mm (1/4 inch) of the piston rod threads.
15. Install the bolt (7). Tighten the bolt (7) to the
torque value on page 3 for the cylinder that is
being repaired. A torque multiplier can be used
to help tighten the bolt (7).
Bur 6-41750
Issued 2-01
Printed in U.S.A.
