Lift Cylinder; Description; Maintenance - Manitowoc Grove RT9130E-2 Service And Maintenance Manual

RT9130E-2 SERVICE MANUAL

LIFT CYLINDER

Description

The lift cylinder has a bore of 14.0 in (35.56 cm) Figure 2-40.
The retracted length of the cylinder from the center of the
barrel bushing to the center of the rod bushing is 194.6 in
(494.2 cm). Its stroke is 153.8 in (390.6 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 3893 lb (1766 kg).

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. Disconnect the tube assembly from the holding valve.
2. Remove the capscrews and flatwashers securing the
holding valve. Remove the holding valve from the
cylinder barrel.
3. Remove the two socket head capscrews securing the
head retainer ring to the head.
4. Using a spanner wrench or chain wrench, unscrew the
head retainer ring from the barrel.
CAUTION
Flying Parts Hazard!
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.
Parts can fly from the cylinder at dangerous speeds when
using air pressure.
CAUTION
Possible Equipment Damage!
Exercise extreme care when handling or setting down the
rod. Damage to the rod surface may cause unnecessary
maintenance and expense.
5. Remove the rod and attached parts from the barrel.
NOTE: Cover the barrel opening to avoid contamination.
Grove
When removing seals and rings, avoid scratching the
grooved and gland surfaces.
6. Remove the two hydrolock seals from the outside of the
piston.
NOTE:
7. Remove the setscrew securing the piston to the rod.
8. Unscrew the piston from the rod.
9. Remove the T-seal from the inside of the piston.
10. Remove the head from the rod. Remove the O-ring and
the backup ring from the outside of the head. Remove
the wear rings, the buffer seal, the deep Z rod seal,
backup ring, and the wiper ring from the inside of the
head.
11. Remove and discard the two threaded inserts from the
head.
12. Remove the head retainer ring from the rod.
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.
Before installing new seals and rings, clean all surfaces
and carefully remove burrs and nicks. Parts displaying
excessive wear or damage should 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.
Published 11-22-2016, Control # 345-12
HYDRAULIC SYSTEM
CAUTION
Possible Equipment Damage!
Arranging worn 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.
CAUTION
2
2-69