Upright SB60 Service & Parts Manual page 38

Section
3.17
3.17 Lift Cylinder
R E M O V A L
1. Raise elevating assembly until cylinder pins are
accessible.
1. Support the elevating assembly(refer to Figure 3-1).
2. Mark and disconnect hoses and immediately cap
the openings to prevent contamination.
3. Remove hardware which secures cylinder. Remove
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. Unscrew head from cylinder
2. Carefully pull shaft assembly from cylinder.
3. Secure end of rod and turn locknut off of rod.
4. Slide piston and head off of the rod.
5. Remove seal kit components (wipers, rod seals, o-
rings and backup rings) from head and piston.
6. 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.
7. 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.
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 install-
ing seals allow at least one hour for the seals to
elastically 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. Slide piston onto rod.
3-24
Maintenance
5. Install locknut (torque locknut to 1900-2400 ft/lbs)
onto rod.
6. Lubricate seals on piston and head with hydraulic
oil.
7. Carefully slide rod assembly into cylinder.
8. Thread head into cylinder.
I N S T A L L A T I O N
1. Follow steps from "REMOVAL" section in reverse
order to install cylinder.
2. Slowly cycle cylinder several times. Check hydraulic
connections for leaks. Check for proper cylinder
operation.
A. Rod
B. Head
C. Piston
D. Locknut
E . Cylinder
Lift Seal kit (100555-010) includes:
1. Wiper
2. Seal
3. Wear Ring
4. O-Ring
5. Backup
Figure 3-23: Lift Cylinder
SB60 Work Platform
3.17
6. O-Ring
7. Seal
8. Wear Ring
9. O-Ring