Upright SB60 Service & Parts Manual page 33

3.12
3.12 Master Cylinder
R E M O V A L
1. Raise elevating assembly until master cylinder pins
are accessible.
2. Support the cage assembly (refer to Figure 3-1).
3. Remove rod end retaining.
4. Mark and disconnect hoses and immediately cap
the openings to prevent contamination.
5. Using a metal drift, remove rod end pin.
6. Remove base end pin retaining bolt and pin.
7. Carefully remove master 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 rod assembly from cylinder.
3. Clamp rod end in vise and remove locknut and piston.
4. Slide the 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 the rod, head, piston, and tube for
scratches, pits, or polishing. 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.
SB60 Work Platform
Maintenance
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 to piston and head.
3. Lubricate rod wiper and seal with hydraulic oil and
4. Install piston and locknut (torque locknut to 375 -
5. Lubricate seals on piston and head with hydraulic
6. Carefully slide rod assembly into cylinder.
7. Thread head into cylinder.
I N S T A L L A T I O N
1. Follow steps from "REMOVAL" section in reverse
2. Remove boom support.
3. Slowly raise and lower boom several times. Check
A. Rod
B. Head
C. Piston
D. Locknut
E . Cylinder
slide head onto rod.
450 ft/lbs) onto rod.
oil.
order to install cylinder.
hydraulic connections for leaks. Check for proper
slave cylinder operation.
1. O-Ring
2. Wiper
3. Seal
4. Wear Ring
Figure 3-18: Master Cylinder
Section
3.12
Seal kit (100553-010) includes:
5. O-Ring
6. Backup
7. O-Ring
8. Seal
9. Wear Ring
3-19