SERVICING THE VALVES
Disassembly
1. On the models 6747, 6760 and 6767, remove six (6) M70
Hex Valve Plugs. On the model 6761, remove four (4)
Hex Socket Screws from each Valve Plug, then remove
Valve Plug.
2. Remove Coil Spring and Washer under Valve Plug.
3. Thread an M12 bolt into the top of the Spring Retainer
and pull out the Valve Assembly (including Retainer,
Spring, Valve Seat, O-Ring and Back-up-Ring) from the
valve chamber.
4. The valve assembly should remain together. If the valve
assembly separates, the parts can easily be removed
without any tools except for the Seat. Use a reverse pliers
or slip the head of a bolt under the edge of the Valve Seat
to remove.
Reassembly
NOTE: For certain applications apply liquid gasket to
the o-ring crevices and seal surfaces. See Tech
Bulletin 053 for model identification.
1. Examine the O-Rings on the Valve Seat and replace if cut
or worn. Lubricate the O-Rings before installing on the
Valve Seat.
2. Examine the surface of the Valve and Valve Seat for pit-
ting, grooves or wear and replace if necessary.
3. Examine the Spring for fatigue, scale or breaks and replace.
4. The Valve Assembly comes as one piece in the service
kit. Using individual parts, assemble Valve Retainer,
Spring, Valve and Seat (with O-Ring and Back-up-Ring)
and snap together securely.
5. Lubricate the O.D. of the Valve Assembly and the I.D. of
the valve chamber and press Valve Assembly squarely
into chamber until completely seated.
6. Replace Washer over top of Retainer, then Coil Spring.
7. Examine the O-Ring on the Valve Plug and replace if cut
or worn. Lubricate new O-Ring before installing on Valve
Plug. Exercise caution not to cut O-Ring on threads of
Valve Plug.
8. Lubricate O.D. of Valve Plug O-Ring and thread into valve
chamber. Exercise caution to avoid extruding O-Ring.
Torque to specifications in chart.
REMOVING THE DISCHARGE MANIFOLD
1. Remove eight (8) M16 Hex Socket Head Screws.
2. To assure alignment use two M16 Studs (PN 88902) as
guides while removing manifold. Tap the back side of the
Discharge Manifold with a soft mallet and gradually work
head from pump. Properly support Discharge Manifold to
avoid damage to the Ceramic Plungers.
REMOVING THE INLET MANIFOLD
1. Remove the center four (4) M16 Hex Head Screws and
the two (2) M16 Hex Nuts from the Studs.
2. Rotate Crankshaft to separate Inlet Manifold from the
Crankcase.
3. Tap the rear of the Inlet Manifold with a soft mallet and
gradually work from pump.
NOTE: Exercise caution and keep Manifold aligned
with Plungers to avoid damage to the Plungers as the
Inlet Manifold is removed.
Removing Valve Plug (6760)
Complete Valve Assembly
Removing screws from Discharge Manifold
