CYLINDERS
Cylinders
354
M8.0-1055-008
01 Rev. 6/08
Carriage Cylinder Disassembly
1. Turn the cap counterclockwise and unscrew it from
the cylinder tube. Refer to Figure 15962.
2. Remove the cap and carefully extract the ram as-
sembly from the cylinder bore, never allowing the
ram to come in contact with any sharp edges.
Carriage Cylinder Repair
Avoid high pressure fluids - escaping fluids under pres-
sure can penetrate the skin, causing serious injury. Re-
lieve pressure before disconnecting hydraulic lines.
Tighten all connections before applying pressure.
Keep hands and body away from pin holes which eject
fluids under high pressure. Use a piece of cardboard or
paper to search for leaks. Do not use your hand.
Any fluid injected into the skin under high pressure
should be considered a serious medical emergency
despite an initial normal appearance of the skin. There
is a delayed onset of pain, and serious tissue damage
may occur. Medical attention should be sought imme-
diately from a specialist who has experience with this
type of injury.
When an excessive amount of hydraulic oil is evident
on the top of the cylinder where the ram exits from the
cap, the rod packing is probably bad and should be re-
placed. The replacement of the packing can be accom-
plished without removing the ram assembly from the
cylinder tube or truck.
1. Make sure all hydraulic pressure has been re-
moved from the carriage cylinders.
2. Carefully remove hydraulic fittings from carriage
cylinder ram. Attempt to absorb any hydraulic oil
draining from lines during this procedure.
3. Remove cylinder cap by turning it in a counter-
clockwise direction.
Seals used in the cylinders are made of an extremely
durable, hard polyurethane material which can be de-
formed temporarily to allow for installation without per-
manent damage.
4. The packing is located below the cap and remains
in the cylinder bore after the cap is removed. A pair
of special tools can be used to facilitate packing
removal (refer to Figure 15963).
Figure 15962
1 Cylinder Tube
2Cap
3O-Ring
4 Bleed Screw
Figure 15963
1 Screwdriver 152 mm (6 in) Shaft Length (Min.) 4 mm
(0.156 in) Shaft Diameter (Max.)
2 No. 8 Metal Screw Headless (4 mm Self-Tapping)
3 Weld (Grind Off Excess) to a Max. Dia. of 4 mm
(0.156 in)
4 Tape
Crown 2007 PF15682-8 Rev. 6/08
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