SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-5
05114624
4. Remove the sealing head. Using the seal removal tool, remove the HP seal
components remaining in the HP cylinder outboard end. Remove the
cylinder bore liner.
5. The HP cylinder can now be to be removed for further tear down, or the
sealing head and it’s HP seal can be serviced. Note that a fully assembled
spare sealing head greatly reduces pump down-time.
6. Prior to installing a new sealing head HP seal, the following tasks should
be accomplished, as necessary:
• Inspect and service inlet check valve
• Inspect and polish sealing head seal surfaces
• Inspect and polish HP cylinder outboard bore surface
7. Wipe the bore liner clean, then install it into the HP cylinder.
8. Lightly grease the sealing head seal components with food grade grease
before installing. Slide the seal assembly onto the boss of the sealing
head. The tan, hard plastic back-up ring must shoulder against the seal
shoulder. The ring is chamfered and must be installed against the
chamfered shoulder of the sealing head. The HP seal must be installed
with the O-ring facing the inlet HP check valve.
9. Lightly lubricate the inside of the HP cylinder outboard end with food
grade grease. Ensure threads are clean and undamaged. Lubricate
cylinder threads with High Purity Goop.
10. Fit the sealing head assembly and head nut together. While holding the
sealing head assembly securely against the head nut, thread nut onto the
HP cylinder. Avoid knocking the end of the seal head against the HP
cylinder to prevent damage to the inlet check valve and to seals or sealing
surfaces.
11. As the head nut threads onto the HP cylinder and the sealing head begins
to resist turning, tap the sealing head outboard end with a plastic hammer
until the sealing head seats against the end of the HP cylinder.
NOTE
It is important to avoid rotating the sealing head relative to the HP cylinder,
as this may cause premature HP seal leaks.
12. The head nut can be threaded by hand onto the HP cylinder. Turn the
head nut until it bottoms out. Then tighten the head nut with the spanner
wrench, finishing with a single, light tap on the wrench handle. Any
torque greater than this could cause problems with loosening the head nut
during subsequent disassembly.
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