Published 08-25-09, Control # 077-04 2-77
RT9130E SERVICE MANUAL HYDRAULIC SYSTEM
STEER CYLINDER
Description
The steer cylinders (Figure 2-45) are mounted on the axles,
two cylinders on each axle.
The front and rear steer cylinders each have 8.89 cm (3.5
inch) diameter bores. The front and rear steer cylinders each
have a retracted length of 711.2 mm (28 inches) from
bushing center to bushing center. The front and rear steer
cylinders each have an extended length of 1073.2 mm
(42.25 inches) from bushing center to bushing center. Each
cylinder has a stroke of 362 mm (14.25 inches).
A wiper ring prevents foreign material from entering each
cylinder. O-rings and other seals prevent internal and
external leakage.
The cylinder weighs approximately 20 kg (40 pounds).
Maintenance
Disassembly
NOTE: Any maintenance requiring disassembly of the
cylinders should include replacement of all seals
and rings. A seal kit will supply the required items.
1. Extend the rod until the piston is approximately 10.2 cm
(4 in) from fully extended.
2. Using a spanner wrench or chain wrench, unscrew the
head from the cylinder barrel.
3. Remove rod and attached parts from the barrel.
NOTE: Cover the barrel opening to avoid contamination.
4. Remove the seal and two wear ring from the outside of
the piston.
NOTE: Arranging discarded seals and rings in the order of
disassembly will aid in installation of new seals and
rings. Pay attention to how each seal and ring is
installed to avoid installing replacement seals and
rings improperly.
5. Loosen and remove the nut securing the piston.
Remove the piston from the rod.
6. Remove the o-ring from the inside of the piston.
7. Remove the head from the rod.
8. Remove the o-ring and backup ring from the outside of
the head and the wiper ring and rod seal from the inside
of the head.
Inspection
1. Clean all parts with solvent and dry with compressed air.
Inspect all parts for serviceability.
2. Inspect the barrel carefully for scoring. If barrel is
scored, it must be repaired or replaced.
3. Check piston for damage. If piston is damaged,
determine if it can be repaired or must be replaced.
4. Inspect rod for straightness. Determine if it can be
straightened or must be replaced.
5. Stone out minor blemishes and polish with a fine crocus
cloth.
6. Clean with solvent and dry with compressed air any
parts that have been stoned and polished.
Assembly
NOTE: Lubricate seals and rings with clean hydraulic oil.
1. Install the replacement wiper ring and rod seal in the
inside of the head. Make sure the lips of the seal face the
piston.
2. Install the replacement o-ring and the backup ring on the
outside of the head.
DANGER
Do not use air pressure to remove the rod. Use only a
source of controlled hydraulic oil pressure if the rod is
hard to remove.
CAUTION
Exercise extreme care when handling or setting down the
rod. Damage to the rod surface may cause unnecessary
maintenance and expense.
CAUTION
When removing seals and rings, avoid scratching the
grooved and gland surfaces.
CAUTION
Before installing new seals and rings, clean all surfaces
and carefully remove burrs and nicks. Parts displaying
excessive wear or damage should be replaced.
CAUTION
When installing new seals and rings, avoid stretching
seals or scratching the grooved or gland surfaces. Make
sure parts are clean before and during assembly. Make
sure seals and rings are installed in the proper order.
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