Section
3-25AB46 Work Platform
Maintenance
3.16 Slave Cylinder
REMOVAL
1. Extend boom until slave cylinder trunion pins are
accessible. Support the cage assembly.
2. Remove rod end pin retaining bolt.
3. Mark and disconnect hoses and immediately cap
the openings to prevent contamination.
4. Using a metal drift, remove rod end pin.
5. Remove trunion pin retaining bolts and using a pin
puller, remove trunion pins.
6. Carefully remove slave 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 from cylinder tube and unscrew
head from cylinder.
2. Carefully pull rod assembly from cylinder.
3. Clamp rod end in vise and turn off rod extension.
Slide piston off of rod.
NOTE: Rod extension is loctited (Loctite #262) onto
rod.
4. Slide the head off of the rod.
5. Remove 1/4 inch socket head cap screws from rod
end of cylinder and remove internal seal block from
cylinder.
6. Remove seal kit components (wipers, rod seals, o-
rings and backup rings) from head, piston and seal
block.
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 parts for scratches, pits, or polishing. Check
seal groves and sealing surfaces. Scratches or pits
deep enough to catch the fingernail are unaccept-
able; 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
3-32 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, head and internal
block.
3. Lubricate rod wiper and seal with hydraulic oil and
slide head onto rod.
4. Clean threaded end of rod and rod extension using
loctite primer.
5. Using loctite #262, install rod extension onto rod.
6. lubricate seal block static seal and carefully push
seal block into cylinder. Secure seal block using 1/4
socket head cap screws.
7. Lubricate seals on piston, head and seal block with
hydraulic oil.
8. Carefully slide rod assembly into cylinder.
9. Thread head into cylinder. Be sure hole for set
screw aligns with hole in cylinder tube.
10. Clean set screw in loctite primer. Install set screw
using loctite #242.
INSTALLATION
1. Follow steps from "REMOVAL" section in reverse
order to install cylinder.
2. Remove boom support.
3. Slowly raise and lower boom several times. Check
hydraulic connections for leaks. Check for proper
slave cylinder operation.
Figure 3-25: Slave Cylinder
E. Set Screw
F. Cap Screw
G. Rod Extension
1. Rod Wiper
2. Rod Seal
3. Static Seal
4. Static Seal
5. Piston Seal
6. Rod Seal
A. Rod
B. Head
C. Piston
D. Cylinder
3.16
Seal kit (068455-010)
includes:
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