SECTION 7
HIGH PRESSURE WATER
Nov 2002
p. 7-9
05126826
3. Using cartridge/plunger removal tool threaded to the seal cartridge, pull
the cartridge outward over the plunger. Seals in the hydraulic cartridge
can be removed and replaced, or the entire cartridge can be replaced. It
is recommended that at least one spare cartridge be kept on hand, ready
to install. See Section 7.3.6 for servicing hydraulic seal cartridge.
4. With the cartridge removed, the plunger can be removed with the
cylinder head in place. Slide the cartridge/plunger removal tool over the
plunger, with the hex-shaped smaller end toward the plunger button.
Note orientation of plunger button retainer pins (6 each), then align hex
flats of tool with pins. Force tool by hand under pins, then rotate tool
slightly to cause pins to retract enough to release plunger. Plunger can
now be extracted from hydraulic piston. See Section 7.3.5 for servicing
the plunger.
5. To install new plunger, slip cartridge/plunger removal tool over plunger,
hex end toward plunger button, to help center plunger in cylinder head.
Position plunger in mating pocket of piston, then force into place by
hand. Using a flashlight, verify that all 6 pins are equally extended to
grip plunger button.
6. Lubricate exposed surfaces of seals in hydraulic seal cartridge with food
grade grease and slide cartridge over plunger into cylinder head cavity.
7. Thoroughly clean cartridge retainer flange, including cross-drilled weep
holes. Install flange and internal retaining ring, making sure that the
retaining ring seats fully inside its groove. Avoid orienting the snap ring
gap in the cylinder head weep groove.
8. HP cylinder and sealing head can now be assembled to the waterjet
pump per Sections 7.2.3 and 7.2.2.
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