Upright AB46 C, Service & Parts Manual

Page: 45 / 148

Section
3-27 AB46 Work Platform
Maintenance
3.18 Steering Cylinder
REMOVAL
1. Mark and disconnect hoses and immediately cap
the openings to prevent contamination.
2. Remove hardware which secures the steering arms
to the spindles.
3. Remove hardware which secures steering cylinder
to the chassis. Remove steering cylinder.
4. Mark steering arms for position on cylinder. Remove
hardware which secures steering arms to rod ends.
Using a hammer and drift, remove the roll pins
which secure the steering arms to the rod ends.
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. Mark heads for position on cylinder. Unscrew heads
from cylinder.
IMPORTANT: Heads must be installed onto same
end of cylinder as they were removed from.
2. Carefully pull rod assembly from cylinder.
3. Remove one snap ring and piston lock.
4. Slide the piston off of the rod.
5. Remove seal kit components (wipers, rod seals, o-
rings and backup rings) from heads 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 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 heads.
3. Lubricate seals on piston. Slide piston on rod and
secure using piston lock and snap ring.
4. Carefully slide rod assembly into cylinder.
5. Thread heads into cylinder.
IMPORTANT: Heads must be installed onto same
end of cylinder as they were removed from.
INSTALLATION
1. Follow steps from "REMOVAL" section in reverse
order to install cylinder.
2. Slowly steering cylinder several times. Check hy-
draulic connections for leaks. Check for proper
cylinder operation.
Figure 3-27: Steering Cylinder
1. Journal Bearing (2)
2. Rod Wiper (2)
3. Rod Seal (2)
4. Static Seal (2)
5. Static Seal
6. Piston Seal
A. Rod
B. Head (2)
C. Piston
D. Cylinder
E. Piston
Lock
F. Snap Ring
3.18
Seal kit (068456-010) includes: