Grove Published 11-10-2014, Control # 524-00 2-103
RT880E SERVICE MANUAL HYDRAULIC SYSTEM
COUNTERWEIGHT PIN CYLINDER
Description
The counterweight pin removal cylinder Figure 2-55 has a
bore of 3.0 in (7.62 cm). The retracted length of the cylinder
is 38 in (96.5 cm). The extended length of the cylinder is 50
in (127 cm). Its stroke is 12 in (30.4 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 69.9 lb (31.75 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. Using a spanner wrench, unscrew the rod end from the
rod.
2. Using a spanner 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.
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.
4. Remove the locknut and unscrew the piston from the
rod.
5. Remove the wear ring and seal from the outside of the
piston and O-ring from the inside of the piston.
6. Remove the head and spacer from the rod.
7. Remove the O-ring and the backup ring from the outside
of the head. Remove the seal and wiper ring from the
inside of the head.
8. Repeat steps 1 through 7 for the remaining rod assem-
bly.
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.
6. Thoroughly rinse parts, allow to drain, and wipe with a
lint-free rag. Inspect all parts for serviceability.
7. Stone out minor blemishes and polish with a fine crocus
cloth.
8. 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.
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.
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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