Removal of Valve Plugs
Examination of O-Ring and Back-up-Ring on Valve Plug
Removal of Valve Assembly
Order of parts in Valve Assembly
Removal of Seal Cases from Manifold Head
Removal of High Pressure Seals
SERVICING THE VALVES
Disassembly
NOTE: Usually the valve assembly will remain together
while being removed.
1. Remove the hex Valve Plugs (top discharge, bottom inlet).
2. Examine the O-Ring under the Valve Plug for cuts or dis-
tortion and replace if worn. Lubricate new O-Rings before
installing.
NOTE: On Models 43HS, 45, 56, 57, 59, 60, 70 there is an
extended Valve Plug with O-Ring and Back-up-Ring.
Install the Back-up-Ring, then the O-Ring into the groove
at the end of the Valve Plug (refer to Tech Bulletin 058).
3. Grasp Spring Retainer by tab at the top with pliers and re-
move from valve chamber.
4. To separate the valve assembly, insert a screwdriver into
the side of the Retainer and press on the back side of the
Valve to begin separation, then between the Retainer and
Valve Seat to separate completely.
5. If the valve assembly separates during removal, remove
the Spring and Valve with a needle nose pliers.
6. Using a reverse pliers, remove the Valve Seat from the
manifold chamber.
Reassembly
1. Examine Spring Retainers for internal wear or breaks in
the structure and replace as needed.
2. Examine Springs for fatigue or breaks and replace as needed.
3. Examine Valves and Seats for grooves, pitting or wear and
replace as needed.
4. Examine Seat and Valve Plug O-Rings for cuts or wear
and replace as needed. Lubricate and install new O-Ring
onto outside diameter of Seat and Valve Plugs.
NOTE: Inlet and discharge valve parts are interchangeable.
Two Valve Kits are needed for complete valve change.
5. Grasp new Valve Assembly by tab at top with pliers and
push into valve chamber. Be certain Valve Assembly is
completely seated in valve chamber.
NOTE: For certain applications apply liquid gasket to
the O-Ring crevices and seal surfaces (refer to Tech
Bulletin 053).
NOTE: For Corrosion Resistant Models remember to
install the Coil Spring between the Valve Plug
and Retainer (refer to Tech Bulletin 046).
6. Apply Loctite 242 to the threads of the Valve Plug, thread
into manifold port and torque per chart.
X
Y
CAUTION: Before commencing with service, shut off drive (electric motor, gas or diesel engine) and turn off water supply to
pump. Relieve all discharge line pressure by triggering gun or opening valve in discharge line.
After servicing is completed, turn on water supply to pump, start drive, reset pressure regulating device and secondary valve, read
system pressure on the gauge at the pump head. Check for any leaks, vibration or pressure fluctuations and resume operation.
