SECTION 7
HIGH PRESSURE WATER
Nov 2002
p. 7-22
05126826
2. With seal and bearings removed, inspect seal groove bottom for marks
or scratches and residue buildup. Clean and /or repair groove
surfaces as required.
3. Install replacement bearing rings (10).
4. Install replacement piston seal assembly (9). First install inner ring,
taking care that this ring is not twisted after installation. Slide outer
seal ring over metal edges, easing seal into place over inner ring.
NOTE: Heating the piston seal ring in hot water (150 degree F for 3-5
minutes) increases seal flexibility.
Service Piston Plunger Sockets (2 each)
1. Remove flat spring bands (6) and remove plunger retainer pins (2).
Inspect pins and spring band for deformation or unusual wear. Clean
and inspect pin holes in piston for unusual wear or hole deformation/
enlargement.
2. Remove plunger button O-ring (8) and backup ring (7) (2 places),
taking care not to scratch or otherwise damage seal groove surfaces.
Clean and inspect seal grooves for residue buildup or surface marks
that might cause seal leaks.
3. Inspect plunger button sockets for unusual wear.
NOTE: Plungers may make an indentation in the bottom of the plunger
socket. The bottom of this socket may show the impression of the
plunger on it due to the high contact forces between piston and
plunger. This compression mark is normal.
Service Piston Internal Check Valves
NOTE: Check valve (4) servicing is not necessary unless there is
suspicion of a problem. If the check valves (2 each) or piston internal
passages must be serviced, seal and pin servicing is also
recommended.
1. Check valves (items (4), 2 each) or cross-drill plug (11) removal may
be necessary. Re-install using thread locking compound applied
sparingly on the plug threads.
CAUTION
Excess compound may clog a check valve or block a
drilled passageway.
NOTE: 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.
2. 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 (3) with thread locking compound. Then
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