8006-13
TM 5-2420-230-24-1
580 SUPER M AND 590 SUPER M BOOM CYLINDER
Disassembly
2. Discard the parts that were removed from the
piston (4), check valve (12), and the gland (3).
NOTE: Refer to illustrations on page 14 and 16.
3. Illuminate the inside of the tube (1). Inspect the
Clean the outside of the cylinder. If the hoses were
inside of the tube (1) for deep grooves and other
removed with the cylinder, remove the hoses from
damage. If there is damage to the tube (1), a
the cylinder.
new tube (1) must be used.
1. Fasten the tube (1) in a vise or other holding
4. Check to be sure that the piston rod (6) is
equipment. Be careful to prevent damage to the
straight. If the piston rod (6) is not straight, install
tube (1).
a new piston rod (6).
2. Loosen and remove the look screw (2) from the
5. Remove small scratches on the inside of the
gland (3) and tube (1).
tube (1) with emery cloth of medium grit. Use the
emery cloth with a rotary motion.
3. Use the gland wrench shown on page 4 to
loosen and remove the gland (3) from the tube
6. Inspect the bushing (20), if equipped, in the
(1).
piston rod eye (5) and the closed end of the tube
(1), and replace as required.
4. Pull the piston rod (6) straight out of the tube (1)
to prevent damage to the tube (1).
7. Inspect the gland (3) for rust and clean and
remove rust as required.
5. Fasten the piston rod eye (5) in a vise and put a
support below the piston rod (6) near the piston
8. Inspect the gland end of the tube (1) for sharp
(4). Use a shop cloth between the support and
edges that will cut the gland O-ring (14) and
the piston rod (6) to prevent damage to the
remove as required.
piston rod (6).
9. Inspect the piston (4) for damage and wear. If the
6. Remove the check valve (12) from the piston.
piston (4) is damaged or worn, a new piston (4)
must be used.
7. Loosen and remove the bolt (7) and hardened
washer (8) that holds the piston (4). Use the
Assembly
torque multiplier shown on page 4 for bolts that
have a high torque value.
NOTE: If a new gland (3) is being installed, put the
8. Remove the piston (4) from the piston rod (6).
part number of the cylinder on the new gland.
9. Remove the gland (3) from the piston rod (6).
1. Install the bushing (16) in the gland (3).
NOTE: If the boom cylinder is being disassembled
2. Install the buffer seal (17) in the gland (3). The
for repair because of poor performance and the seals
side of the buffer seal (17) with the lip must be
(10) on the piston (4) are good, replace the check
toward the small end of the gland (3).
valve (12) and the O-ring (13). If the seals (10) are
3. Install the wide seal (18) in the gland (3). The
damaged, do the next step.
wide seal (18) is to be installed so that the lips of
10. Remove the wear ring (9), seals (10), and the
the wide seal (18) are toward the small end of
backup rings (11) from the piston (4).
the gland (3). The wide seal (18) can be difficult
to install. Use the tool shown on page 4.
11. Remove the O-ring (14), backup ring (15), wiper
(19), wide seal (18), buffer seal (17), and bushing
4. Install a new wiper (19) in the gland (3). The lips
(16) from the gland (3).
of the wiper (19) must be toward the outside of
the gland (3).
12. Remove the O-ring (13) from the check
valve (1 2).
5. Install a new backup ring (15) in the groove on
the outside of the gland (3). If both sides of the
Inspection
backup ring (15) are not flat, the side that is not
flat must be toward the small end of the gland
1. Clean the piston (4), gland (3), piston rod (6),
(3).
tube (1), hardened washer (8), and bolt (7) in
cleaning solvent. Make sure the orifice in the
piston (4) is open.
H-21
Bur 6-41750
Issued 2-01
Printed in U.S.A.
