Axle Oscillation Lockout Cylinder; Description; Maintenance - Manitowoc Grove RT765E-2 Service And Maintenance Manual

RT765E-2 SERVICE MANUAL

AXLE OSCILLATION LOCKOUT CYLINDER

Description

The oscillation lockout cylinder Figure 2-46 has a 5 in
(12.7 cm) diameter bore.
The retracted length of each cylinder is 19.25 in (48.8 cm)
from the center of the lug holes to the center of the barrel
bushing. The cylinder has a stroke of 6.62 in(16.8 cm) which
gives an extended length of 25.88 in (65.7 cm) from the end
of the barrel to the center of the cylinder block.
A wiper ring prevents foreign material from entering each
cylinder. O-rings and other seals prevent internal and
external leakage.
The cylinder weighs approximately 85.5 lb (38.8 kg).

Maintenance

Disassembly
NOTE: Any maintenance requiring disassembly of the
cylinder should include replacement of all cylinder
seals.
1. Drain the oil from the cylinder.
2. Open both ports on the side of the barrel.
3. Secure cylinder barrel in a chain vise without putting
pressure on the side feeder tube preferably in the
vertical position with the rod assembly up.
CAUTION
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. Injury may result from the cylinder rod
unexpectedly exiting the cylinder barrel.
CAUTION
Exercise extreme care when handling or setting down the
cylinder rod. Do not damage the chrome surface.
4. Clean away all dirt from the head. Place protective
padding around the rod near the head to prevent
damaging the chrome. Using a spanner wrench,
unscrew the head from the barrel.
5. Using a screwdriver or 1/4 inch wrench, remove the
screw from the head.
6. Remove the grease fitting from the rod.
GROVE
7. Turn the head counterclockwise with a fitted spanner
wrench until the threads disengage.
NOTE: Residual oil will spill over the end of the barrel.
Make Provisions to contain the oil.
8. Using a hoist, extend the rod assembly slowly until the
piston is free of the barrel.
9. Place the rod assembly horizontally on a workbench
taking care not to damage the surface of the rod. Cover
the open end of the barrel to avoid contamination.
10. Remove the retaining ring from the rod.
11. The head can be pulled off the rod assembly by hand.
When removing seals and rings, avoid scratching the
grooved and gland surfaces.
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.
12. Remove the wear rings and lip seals from the outside of
the piston.
13. Remove the o-ring and backup ring from the outside of
the head. Remove the wear ring, buffer 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
present 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
unacceptable. 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
unacceptable. Polishing indicates uneven loading, and
the diameter should be checked for out-of roundness.
5. Inspect the barrel carefully for scoring. If barrel is
scored, it must be repaired or replaced.
6. Thoroughly rinse parts, allow to drain, and wipe with a
lint-free rag. Inspect all parts for serviceability.
Published 9-04-2014, Control # 422-08
HYDRAULIC SYSTEM
CAUTION
or polishing. Deep scratches
2
are
2-75