SECTION 7
HIGH PRESSURE WATER
May 2003
p. 7-25
49831951
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.
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
thread retainer (3) over check valve cartridge (4). Allow 24 hours for
thread locking compound to set.
3. Install plugs (11) in cross- drilled passages by applying thread locking
compound to plug threads. Then thread plugs (2 each per hole), with the
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