SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-17
05114624
7.3.4 HP Cylinder
1. At a workbench, use the seal removal tool to prevent scratching the cylinder
bore sealing surface. Use a pulling action to remove the sealing head HP
seal.
2. Remove the bore liner. Use a plastic-faced hammer and the seal removal
tool to drive out the plunger HP seal and follower. Be careful not to scratch
the bore of the cylinder or damage the cylinder threads.
3. Clean sealing areas of HP cylinder inside diameter and inspect cylinder for
rings, scratches, pits, residue build-up and other potential leak paths. Seal
material or residue can build up forming a ring, and running a fingernail
across it, will cause it to appear as a surface flaw. It is usually necessary to
clean the area before performing an inspection.
4. Use 600 grit wet/dry sandpaper to polish HP cylinder inside diameter where
the seal will locate. Polish only in a circumferential motion. Do not polish
or drag the sandpaper along the length of the cylinder. Hold the sandpaper
on the end of your finger, and move in a cylindrical wiping motion in the
bore of the HP cylinder. Wipe residue from cylinder inside diameter and
re-inspect for surface defects.
NOTE
The HP cylinder ends often show a “step” between inner and outer
sleeves where the inner sleeve extends beyond the outer by a small
amount. This is normal and does not indicate a flaw in the cylinder.
Item Description
(1) Cylinder Body (2) Plunger (3) Plunger Seal Follower
(5) Cylinder Head (6) Liner
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