355
M8.0-1055-009
01 Rev. 6/08
CYLINDERS
Cylinders
To make these tools, weld or braze a headless 4.0 mm
self-tapping (No. 8 metal) screw to the end of a screw-
driver. The screwdriver must have at least 150 mm
(6.0 in) of shank length with no larger than 4.0 mm
(0.156 in) shank diameter. After attaching the screw to
the screwdriver, grind off excess weld to a diameter of
4.0 mm (0.156 in). Wrap the shank with electrical tape
from the tip of the screw to the screwdriver handle. This
will prevent scratching of the cylinder bore or the ram.
Extreme care should be taken to prevent damage to
cylinder wall and ram assembly.
5. Insert the tools between the ram and the cylinder
walls, 180° apart, and screw into the face of the
packing (refer to Figure 15964).
6. After the threads are sufficiently secured into the
packing, evenly pull on the screwdriver handles
until the packing is removed.
Close inspection of seal seating critical areas should
be made before the new seal is installed.
Refer to Figure 15970. Your seal failure may not have
been caused by a worn seal, but rather by burrs, nicks
and dirt located on the seal seating area, causing the
seal to deform and lose its sealing ability.
7. At this time, the wiper ring should also be removed
since packings and wiper rings should always be
replaced in pairs. Thoroughly clean the area where
the seals seat. Any burrs, dirt or seal debris must
be removed before installing new seals.
8. Tools used to install hydraulic seals should be of
soft metal or suitable plastic, free of burrs and
sharp edges. Screwdrivers and other similar tools
should not be used as they may damage the seal-
ing edges.
9. The area in contact with the seal should be free of
burrs, sharp edges and nicks.
10. If necessary to force seal over sharp edges, slots
or undercuts, protective devices should be used.
11. Light lubrication should be applied to the seal and
installation groove prior to installation. The same
oil that will be used later in the cylinder should be
applied.
Figure 15964
1 Seal Pulling Tool
2Ram
3 Cylinder Tube
4 Seal
Figure 15970
1 Critical Seal Seating Area
2 Seal
3 Forging Tool
4 Sleeve
5 Cylinder Tube
6Collar
Crown 2007 PF15682-9 Rev. 6/08
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