8006-21
TM 5-2420-230-24-1
Assembly
16. Install a new wear ring (9) in the groove in the
center of the piston (4).
1. Install the bushing (17) in the gland (3).
17. Install a new seal (9) in the groove on the outside
2. Install the buffer seal (16) in the gland (3). The
end of the piston (4). The seal (9) must be in the
side of the buffer seal (16) with the lip must be
groove at the end of the piston (4) with the large
toward the small end of the gland (3).
bore.
3. Install the rod seal (15) in the gland (3). The rod
18. Install a ring (10) over the seal (9) on the piston
seal (15) is to be installed so that the lips of the
(4).
rod seal (15) are toward the small end of the
19. Install the wear ring (11) on the piston (4).
gland (3). The rod seal (15) can be difficult to
install. Use the tool shown on page 4.
20. Fasten the tube (1) in a vise or other holding
equipment. Be careful to prevent damage to the
4. Install a new wiper (14) in the gland (3). The lips
tube (1).
of the wiper (14) must be toward the outside of
the gland (3).
21. Lubricate the inside of the tube (1) and the piston
(4) with clean oil.
5. Install a new backup ring (13) in the groove on
the outside of the gland (3). If both sides of the
22. Push the piston (4) straight into the tube (1)
backup ring (13) 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 (12) on the gland (3) with
6. Install the O-ring (12) next to the backup ring (13)
clean oil.
in the groove on the outside of the gland (3). The
O-ring (12) must be toward the small end of the
25. Tighten the gland (3) to 135 to 542 Nm (100 to
gland (3).
400 pound-feet). If the lock screw (2) holes
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
8. Remove any marks and sharp edges on the
Nm (20 pound-inches). If the lock screw (2) holes
chamfer at the end of the piston rod (6)
are not aligned, do steps 25 through 27.
9. Lubricate the bore of the gland (3) and the piston
26. Tighten the gland (3) to 135 to 542 Nm (100 to
rod (6) with clean oil.
400 pound-feet).
10. Push the gland (3) onto the piston rod (6). If
27. Use a No. 26 drill and drill a hole half in the gland
necessary, use a soft hammer to drive the gland
(3) and half in the tube (1). Drill to a depth of 11
(3) onto the piston rod (6).
mm (7/16 inch). Do not drill in line with a hole in
the gland (3) for the gland wrench.
11. Put a support below and near the end of the
piston rod (6). Use a shop cloth between the
28. Install the lock screw (2). Tighten the lock screw
support and the piston rod (6) to prevent damage
(2) to 2.3 Nm (20 poundinches).
to the piston (4).
29. If the hoses were removed with the cylinder,
12. Put the piston (4) on the end of the piston rod (6).
install new O-rings, if equipped, on the hose
fittings. Lubricate the O-rings with clean oil. Install
13. Put the hardened washer (8) on the bolt (7).
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 6.4 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 6.4 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).
H-29
Bur 6-41750
Issued 2-01
Printed in U.S.A.