Maintenance; Outrigger Extension Cylinder; Description - Manitowoc Grove TMS800E Service And Maintenance Manual

HYDRAULIC SYSTEM

OUTRIGGER EXTENSION CYLINDER

Description

The four extension cylinders (see Figure 2-49) have 6.4 cm
(2.5-in) diameter bores and are installed within the outrigger
beams. The cylinders are a combination unit with two rods,
one for extending each direction. Each half of the cylinder is
a double-acting type cylinder.
Each cylinder has a retracted length of 182.7 ± 0.30 cm
(71.94 ± 0.12 in) from the center of the rod mounting hole to
the center of the other rod mounting hole. The cylinder's
extended length is 432.8 cm (170.4 in). The stroke of the
cylinder is 250.1 cm (98.50 in)
A wiper ring prevents foreign material from entering each
cylinder. O-rings and other seals prevent internal and
external leakage.
The cylinder weighs approximately 70.3 kg (188.3 lb).

Maintenance

Disassembly
Upper Barrel
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. Clean away all dirt from the head. Place protective
padding around the rod near the head.
2. Using a spanner wrench, unscrew the cylinder head
from the upper barrel.
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.
3. Remove the upper cylinder rod assembly from the
cylinder barrel.
NOTE: Cover the barrel opening to avoid contamination.
CAUTION
When removing seals and rings, avoid scratching the
grooved and gland surfaces.
2-70
CAUTION
Published 01-29-2014, Control # 496-00
TMS800E SERVICE MANUAL
4. Remove the two wear rings and seal from the outside of
the piston.
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.
5. Loosen and remove the locknut securing the piston.
Remove the piston from the rod.
6. Remove the O-ring from the inside of the piston.
7. Remove the spacer from the rod.
8. Remove the head from the rod.
9. Remove the O-ring, backup ring and retaining ring from
the outside of the head. Remove the seal wiper ring and
wear rings from the inside of the head.
Lower Barrel
1. Using a spanner wrench, unscrew the cylinder head
spacer from the lower barrel.
2. Remove the rod assembly from the lower barrel.
NOTE: Cover the cylinder barrel opening to prevent
contamination from dust and dirt.
3. Remove the hydrolock seal assemblies from the outside
of the piston.
4. Remove the setscrew and unscrew the piston from the
cylinder rod and remove the piston from the rod.
5. Remove the O-rings and seal from the inside of the
piston.
6. Remove the head and spacer from the rod.
7. Remove the O-ring and backup ring from the outside of
the cylinder head and the wear rings and seal from the
inside of the head.
8. Remove the wiper ring from the inside of the head
spacer.
Inspection
1. Clean all parts with solvent and dry with compressed air.
Inspect all parts for serviceability.
CAUTION
Clean all surfaces and remove all burrs and nicks.
Replace all damaged or worn parts.
2. Stone out minor blemishes and polish with fine crocus
cloth.
3. Clean with solvent and dry with compressed air parts
that have been stoned and polished.