8006-25
TM 5-2420-230-24-1
SWING CYLINDERS
Disassembly
16. Check to be sure that the piston rod (6) is
straight. If the piston rod (6) is not straight, install
NOTE: Refer to illustrations on page 26 and 28.
a new piston rod (6).
Clean the outside of the cylinder. If the hoses
17. Remove small scratches on the piston rod (6) or
were removed with the cylinder, remove the hoses
inside the tube (1) with emery cloth of medium
from the cylinder.
grit. Use the emery cloth with a rotary motion.
1. Fasten the tube (1) in a vise or other holding
18. Inspect the bushing (22) and snap rings (23) in
equipment. Be careful to prevent damage to the
the piston rod eye (5) and bushings (22) on the
tube (1).
trunnions on the tube (1), replace as required.
2. Loosen and remove the lock screw (2) from the
19. Inspect the gland (3) for rust and clean and
gland (3) and tube (1).
remove rust as required.
3. Use the gland wrench shown on page 4 to
20. Inspect the gland end of the tube (1) for sharp
loosen and remove the gland (3) from the tube
edges that will cut the gland O-ring (13), remove
(1).
as required.
4. Pull the piston rod (6) straight out of the tube (1)
Assembly
to prevent damage to the tube (1).
5. Fasten the piston rod eye (5) in a vise and put a
NOTE: If a new gland (3) is being installed, put the
support below the piston rod (6) near the piston
part number of the cylinder on the new gland.
(4). Use a shop cloth between the support and
1. Install the bushing (18) in the gland (3).
the piston rod (6) to prevent damage to the
piston rod (6).
2. Install the buffer seal (17) in the gland (3). The
side of the buffer seal (17) with the lip must be
6. Loosen and remove the bolt (7) and hardened
toward the small end of the gland (3).
washer (8) that holds the piston (4). Use the
torque multiplier shown on page 4 for bolts that
3. Install the wide seal (16) in the gland. The wide
have a high torque value.
seal (16) is to be installed so that the lips of the
wide seal (16) are toward the small end of the
7. Remove the piston (4) from the piston rod (6).
gland (3). The wide seal (16) can be difficult to
8. Remove the gland (3) from the piston rod (6).
install. Use the tool shown on page 4.
9. Remove the wear ring (9), seal (10), backup ring
4. Install a new wiper (15) in the gland (3). The lips
(11), and piston ring (12) from the piston (4).
of the wiper (15) must be toward the large end of
the gland (3).
10. Remove the O-ring (13), backup ring (14), wiper
(15), wide seal (16), buffer seal (17), and bushing
5. Install a new backup ring (14) in the groove on
(18) from the gland (3).
the outside of the gland (3). If both sides of the
backup ring (14) are not flat, the side that is not
11. Remove the end cap (21) from the tube (1).
flat must be toward the small end of the gland
12. Remove the backup ring (19) and O-ring (20)
(3).
from the end cap (21).
6. Install the O-ring (13) next to the backup ring (14)
in the groove on the outside of the gland (3). The
Inspection
O-ring (13) must be toward the small end of the
gland (3).
13. Clean the piston (4), gland (3), piston rod (6),
tube (1), hardened washer (8), and bolt (7) in
cleaning solvent. Make sure the orifice in the
piston (4) is open.
14. Discard the parts that were removed from the
piston (4), gland (3) and the end cap (21).
15. Illuminate the inside of the tube (1). Inspect the
inside of the tube (1) for deep grooves and other
damage. If there is damage to the tube (1), a
new tube (1) must be used.
Bur 6-41750
Issued 2-01
Printed in U.S.A.
