HYDRAULIC SYSTEM RT880E SERVICE MANUAL
2-94 Published 11-10-2014, Control # 524-00
OUTRIGGER JACK CYLINDER
Description
The four outrigger jack cylinders Figure 2-52 each have a
hollow rod for internal porting. Each cylinder has a 5.5 in
(13.9 cm) 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 50.62 in ±0.12 (128.5 cm ±30.8). The extended
length of the cylinder from the end of the barrel to the center
of the rod’s port block rod bushing is 78.62 in (199.6 cm). Its
stroke is 28 in (71.1 cm). A wiper ring prevents foreign
material from entering the cylinder. O-rings and other seals
prevent internal and external leakage.
The cylinder weighs approximately 228.8 lb (103.8 kg).
Maintenance
Disassembly
NOTE: Any maintenance requiring disassembly of the cyl-
inders should include replacement of all seals and
rings. A seal kit will supply the required items.
1. Open ports and drain the oil from the cylinder.
2. Secure cylinder barrel in a chain vise preferably in the
vertical position with the rod assembly at chest level.
NOTE: Oil or oil/air mixture may rapidly exit out of the ports
during extension. Shield the work area from the
exiting oil.
3. With the ports open, extend the rod assembly with a
hoist enough to access the top of the head with a span-
ner wrench. Do not extend completely.
4. Turn the head counterclockwise with a fitted spanner
wrench until the threads disengage.
5. Extend the rod assembly slowly until the piston is free of
the barrel assembly. Place the rod assembly horizontally
on a workbench taking care not to damage the surface
of the rod.
6. Cover the open end of the barrel.
7. Secure the rod assembly using the pinholes. Do not use
a clamp on the rod working surface.
8. Using an Allen wrench, remove the setscrew from the
piston. The piston seal must be removed to access the
setscrew.
9. Turn the piston counterclockwise with a fitted spanner
wrench to remove.
10. Remove the spacer and head from the rod by hand.
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.
11. Remove the O-ring and backup rings from the inside of
the piston and the seals from the outside of the piston.
12. Remove the O-ring and backup ring from the outside of
the head and the wear rings, rod seal and wiper ring
from the inside of the head.
Inspection
1. Inspect the rod. There should be no scratches or pits
deep enough to catch the fingernail. Pits that go to the
base metal are unacceptable. Chrome should be pres-
ent over the entire surface of the rod. If lack of chrome
on rod, the rod should be replaced.
2. Inspect rod for straightness. Determine if it can be
straightened or must be replaced.
3. Inspect the head. Visually inspect the inside bore for
scratching or polishing. Deep scratches are unaccept-
able. Polishing indicates uneven loading, and the bore
should be checked for out-of-roundness.
4. Inspect the piston. Visually inspect the outside surface
for scratches or polishing, Deep scratches are unaccept-
able. Polishing indicates uneven loading, and the diame-
ter should be checked for out-of roundness.
5. Inspect the barrel carefully for scoring. If barrel is
scored, it must be repaired or replaced.
WARNING
Do not use air pressure to remove the rod. Use only a
source of controlled hydraulic oil pressure if the rod is
hard to move.
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.
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