Section
3-29AB46 Work Platform
Maintenance
3.20 Boom Raise & Boom Riser
Cylinders
REMOVAL
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. Remove set screw from cylinder tube and unscrew
head from cylinder.
2. Unscrew head from cylinder
3. Carefully pull shaft assembly from cylinder.
4. Remove 3/16 set screw which secures piston to rod.
NOTE: Set screw is loctited (Loctite #242) into
piston.
2. Secure end of rod and turn piston off of rod.
4. Slide stop tube 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
3-32 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 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 stop tube onto rod.
5. Thread piston onto rod. Be sure set screw hole lines
up with hole on end of rod.
6. Using loctite #242, secure piston to rod with 3/16
set screw.
7. Lubricate seals on piston and head with hydraulic
oil.
8. Carefully slide rod assembly into cylinder.
9. Thread head into cylinder. Be sure hole for setscrew
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. Slowly cycle cylinder several times. Check hydraulic
connections for leaks. Check for proper cylinder
operation.
Figure 3-29: Boom Riser Cylinder (shown)
E. Set Screw
F Set Screw
G. Stop Tube
1. Piston Seal
2. Wear Ring
3. Rod Wiper
4. Rod Seal
5. Static Seal
A. Rod
B. Head
C. Piston
D. Cylinder
3.20
Boom Raise Seal kit (068451-010) includes:
Boom Riser Seal kit (068450-010) includes:
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