Lift Cylinder; Description; Maintenance - Manitowoc Grove RT540E Service Maintenance Manual

RT540E SERVICE MANUAL

LIFT CYLINDER

Description

The lift cylinder (Figure 2-28) has a bore of 22.8 cm (9.0
inches). The retracted length of the cylinder from the center
of the barrel bushing to the center of the rod bushing is
265.1cm (104.4 inches). The extended length of the cylinder
from the center of the barrel bushing to the center of the rod
bushing is 464.5 cm (182.9 inches). Its stroke is 199.3 cm
(78.5 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 521 kg (1149 lb).

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 washers securing the
holding valve and remove the holding valve from the
cylinder barrel.
3. Break the tack weld and remove the pin and retaining
plate.
4. Using a spanner wrench or chain wrench, unscrew the
head from the barrel.
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 move.
CAUTION
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.
CAUTION
When removing seals and rings, avoid scratching the
grooved and gland surfaces.
GROVE
6. Remove the two hydrolock seals and guidelock ring from
the outside of the piston.
NOTE:
7. Remove the set screw securing the piston to the rod.
8. Unscrew the piston from the rod.
9. Remove the O-ring and two backup rings from the inside
of the piston.
10. Remove the head from the rod.
11. Remove the O-ring and the backup ring from the outside
of the head and the wear ring, buffer seal, deep Z 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.
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.
Assembly
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.
NOTE:
Published 4-20-2015, Control # 502-01
HYDRAULIC SYSTEM
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.
CAUTION
CAUTION
Lubricate seals and rings with clean hydraulic oil.
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