SECTION 7
HIGH PRESSURE WATER
Nov 2002
p. 7-6
05126826
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.
Note that if replacing HP seals in one cylinder without replacing plunger,
then plunger can be stopped in fully –retracted position by disconnecting
opposite-end proximity switch cable while pump is running, then
proceeding with HP cylinder diasssembly.
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 (item (31), Figure 12-1 Parts
Lists). 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 (refer to Section
7.3.4 “HP Cylinder”).
6. Reinstall the cartridge retainer flange with its retaining (snap)
ring. Before assembly, lightly lubricate the packing follower and
the seal assembly with food grade grease. Note that the inside
diameter groove of the packing follower should be greased. Slide
plunger seal packing follower over plunger. Install plunger HP
seal assembly over plunger in the following order:
• Solid plastic backup ring against follower
• U-shaped seal and O-ring against backup ring
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