8006-20
TM 5-2420-230-24-1
590SM EXTENDABLE DIPPER CYLINDER
Inspection
Disassembly
NOTE: Refer to illustration on page 22.
1. Clean the piston (4), gland (3), piston rod (6),
tube (1), washer (8), and bolt (7) in cleaning
Clean the outside of the cylinder. If the hoses were
solvent.
removed with the cylinder, remove the hoses from
the cylinder
2. Discard the parts that were removed from the
piston (4) and the gland (3).
1. Fasten the tube (1) in a vise or other holding
equipment. Be careful to prevent damage to the
3. Illuminate the inside of the tube (1). Inspect the
tube (1).
inside of the tube (1) for deep grooves and other
damage. If there is damage to the tube (1), a
2. Loosen and remove the lock screw (2) from the
new tube (1) must be used.
gland (3) and tube (1).
4. Check to be sure that the piston rod (6) is
3. Use the gland wrench shown on page 4 to
straight. If the piston rod (6) is not straight, install
loosen and remove the gland (3) from the tube
a new piston rod (6).
(1).
5. Remove small scratches on the inside of the
4. Pull the piston rod (6) straight out of the tube (1)
tube (1) with emery cloth of medium grit. Use the
to prevent damage to the tube (1).
emery cloth with a rotary motion.
5. Fasten the piston rod eye (5) in a vise and put a
6. Inspect the bushings (18) in the piston rod eye
support below the piston rod (6) near the piston
(5) and the closed end of the tube (1). Replace
(4). Use a shop cloth between the support and
as required.
the piston rod (6) to prevent damage to the
piston rod (6).
7. Inspect the gland (3) for rust and clean and
remove rust as required.
6. Loosen and remove the bolt (7) and washer (8)
that holds the piston (4). Use the torque
8. Inspect the gland end of the tube (1) for sharp
multiplier shown on page 4 for bolts that have a
edges that will cut the gland O-ring (12) and
high torque value.
remove as required.
7. Remove the piston (4) from the piston rod (6).
9. Inspect the piston (4) for damage and wear. If the
piston (4) is damaged or worn, a new piston (4)
8. Remove the gland (3) from the piston rod (6).
must be used.
9. Remove the seal (9), ring (10), and wear ring
(11) from the piston (4).
10. Remove the O-ring (12), backup ring (13), wiper
(14), rod seal (15), seal (16), and bushing (17)
from the gland (3).
H-28
Bur 6-41750
Issued 2-01
Printed in U.S.A.
