Section
3-25SB60 Work Platform
Maintenance
3.18 Boom Extend Cylinder
DISASSEMBLY
Note: Provide a clean work area for this operation,
and observe clean assembly practices. Seals and
hydraulic cylinder components are highly sensitive to
contamination that may not be visible to the naked
eye.
1. Remove set screw and unscrew head from cylinder.
3. Carefully pull shaft assembly from cylinder.
4. Secure rod end and turn locknut off of shaft.
5. Slide the head off of the rod.
6. Remove seal kit components (wipers, rod seals, o-
rings and backup rings) from head and piston.
7. Thoroughly clean all parts with solvent. Rinse the
inside of the tube and allow to drain. A high pres-
sure rinse and wipe with a lint free rag is preferable.
8. Inspect cylinder parts for scratches, pits, or polish-
ing. Check seal groves and sealing surfaces.
Scratches or pits deep enough to catch the fingernail
are unacceptable, replace the cylinder. Polishing is
a sign of uneven loading. When this occurs, the
surface should be checked for roundness. Cylinders
not round within .007" should be replaced.
Figure 3-24: Boom Extend Cylinder
3.18
1. O-Ring
2. Wiper
3. Seal
4. Seal
5. O-Ring
6. Wear Ring
7. Back up
8. O-Ring
9. Wear Ring
10. Seal
A. Rod
B. Head
C. Spacer
D. Piston
E. Locknut
F. Cylinder
Seal kit (100554-010) includes:
ASSEMBLY
NOTE: Torque all hardware to torques listed on
page 3-29 unless otherwise specified.
1. Lubricate all components and seals with clean
hydraulic oil prior to assembly.
Note: To avoid cutting the seals, do not use sharp
edged tools during seal replacement. After installing
seals allow at least one hour for the seals to elasti-
cally restore to their original shape before assembling
cylinder.
2. Install new seal kit items to piston and head.
3. Lubricate rod wiper and seal with hydraulic oil and
slide head onto rod.
4. Install locknut onto rod (torque locknut to 525-640
ft/lbs).
5. Lubricate seals on piston and head with hydraulic
oil.
6. Carefully slide rod assembly into cylinder.
7. Thread head into cylinder.
3.18
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