SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-6
05114624
7.2.3 HP Cylinder
Remove from/Install in Waterjet Pump
The HP cylinder can be unthreaded from the cylinder head either with or
without its head nut and sealing head assembled to it. We recommend the
following procedure since the combined parts make up a rather heavy assembly
that is difficult to handle.
1. Remove sealing head from HP cylinder by following procedures outlined in
Section 7.2.2.
2. Unthread the HP cylinder from its hydraulic cylinder head using the special
cylinder wrench. Support the weight of the cylinder until it completely clears
the plunger. The cylinder is heavy and may damage the plunger or cause
injury if it is not supported.
3. With the HP cylinder removed the plunger HP seal can be serviced and the
complete cylinder can be inspected and polished as described in Section
7.3.4. Remove the plunger HP seal and seal follower from the HP cylinder
using the special aluminum seal removal tool. Be careful not to scratch the
bore of the HP cylinder.
4. Remove cartridge retainer flange from hydraulic cylinder head by first
removing retaining ring using a flat blade screwdriver. Wipe and clean
surfaces, weep holes, and grooves in cartridge retainer flange. Check
retainer flange for cracks.
5. Prior to installing a new plunger HP seal, the following tasks should be
accomplished, as necessary:
• Inspect plunger’s exposed surface for scratches, surface discoloration, or
unusual contact markings. Remove and replace plunger
• Inspect and polish HP cylinder bore surface.
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