Published 08-25-09, Control # 077-04 2-83
RT9130E SERVICE MANUAL HYDRAULIC SYSTEM
OUTRIGGER STABILIZER CYLINDER
Description
The four outrigger stabilizer cylinders each have a hollow rod
for internal porting (Figure 2-47). Each cylinder has a 165.1
mm (6.5 inch) diameter bore. A port block is welded to the
rod of each cylinder and a pilot operated check valve is
threaded into each port block.
The retracted length of the cylinder from the end of the barrel
to the center of the rod’s port block rod bushing is 1416 mm
(55.75 inches). The extended length of the cylinder from the
end of the barrel to the center of the rod’s port block rod
bushing is 2235.2 mm (88 inches). Its stroke is 819.2 mm
(32.25 inches).
A wiper ring prevents foreign material from entering the
cylinder. O-rings and other seals prevent internal and
external leakage.
The cylinder weighs approximately 100 kg (220.4 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. Remove the check valve from the port block.
2. Loosen the head’s setscrew. Using a chain wrench,
unscrew the head from the barrel.
3. Remove the rod and attached parts from the barrel.
NOTE: Cover the barrel opening to avoid contamination.
4. Remove a hydrolock seal from the outside of the piston
to gain access to the set screw.
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. Remove the piston’s set screw. Unscrew the piston from
the rod.
6. Remove the other hydrolock seal from the outside of the
piston.
7. Remove the o-ring and the two backup rings from the
inside of the piston.
8. Remove the spacer from the rod.
9. Remove the head from the rod.
10. Remove the o-ring and the backup ring from the outside
of the head and the two wear rings, buffer seal, rod seal
and wiper ring 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. Verify internal
passages and ports are clean and undamaged.
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.
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.
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