SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-22
05114624
2. Clean and inspect the seal groove and glide ring grooves (2 each) for unusual
scratches, residue buildup, etc. Inspect outside diameter surfaces of piston
for signs of contact with cylinder walls. If other than superficial damage has
occurred, the piston should be replaced. Install the 2-part piston seal in the
center groove. Install the square cross-sectioned backup ring in the groove,
taking care to see that this ring lies flat against the groove bottom. Install
the seal over the backup ring using the dull-bladed tool.
If this ring is allowed to twist, and not lie flat against the
groove bottom, it can cause uneven wear and premature
failure of the seal.
3. To install glide rings, spread each ring at its split, and then position these
rings in their respective grooves.
4. Disassemble plunger retainer pins and button seals then clean grooves and
holes. Inspect plunger cavities (2 each) for unusual wear, scratches, etc.
The bottom of this cavity will normally show the impression of the plunger
on it due to the high contact forces between piston and plunger.
5. Install new backup ring and O-ring in each internal groove in each plunger
pocket. Failure to install backup ring can result in plunger being forced out
of plunger pocket.
6. Inspect elastic pin retaining band for cuts, material flaws or other signs of
weakness. Install pins (6 each) around plunger pocket. Position elastic
band over pins. Repeat for other plunger pocket.
7. Check valves (2 each) or cross-drill plug removal may be necessary.
Re-install using thread locking compound applied sparingly on the plug
threads. Excess compound may clog a check valve or block a drilled
passageway. To avoid excess compound, position the plug or retainer on its
Allen wrench, apply thread locking compound, then hold the plug/retainer
horizontal on a paper towel while rotating the plug/retainer to wipe off
excess thread locking compound.
8. Install O-ring in check valve cavity, positioning in hole bottom with pencil-
like blunt instrument. Install check valve with chamfered end toward
O-ring. Coat retainer with thread locking compound. Then, thread retainer
over check valve cartridge. Allow 24 hours for thread locking compound to
set.
9. Install plugs in cross- drilled passages by applying thread locking compound
to plug threads. Then thread plugs (2 each per hole), with the second plug
acting to lock in the first. Allow 24 hours for thread locking compound to
set.
CAUTION
!
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