SECTION 7
HIGH PRESSURE WATER
Nov 2002
p. 7-5
05126826
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 removed for further tear down, or the
sealing head and 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 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. Alternatively, the sealing head can be pushed
gradually into place by threading the sealing head retainer nut.
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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