SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-9
05114624
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), and 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.
8. HP cylinder and sealing head are now able to be assembled to the waterjet
pump per Sections 7.2.3 and 7.2.2.
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