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SERVICING
THE
PUMPING SECTION
Remove the nuts on the manifold studs. Grasp the
fingers on the underside and tap with a soft mallet to
manifold and the discharge valve seats with three
remove. Photo 1. When the manifold is removed in this
manner, the separation is between the discharge valve
seats and the
cylinders. Discharge valves seats:
discharge valve, discharge valve springs and retainers
remain with the
manifold. (They must be
properly
placed in the manifold before
it
is replaced.)
Slip cylinders out of the inlet manifold.
Photo 2.
Cylinders must be identified so they will be replaced in
their original position.
Remove caner pins. nuts,
CUP
washers, and piston assemblies. Inspect inlet valves and
inlet valve surfaces (at the rear of the piston assembly).
If inlet valve is damaged, reverse
it;
other side also has a
lap surface. If piston inlet surface is damaged, replace
piston assembly. Photo
3.
The inlet valve surface of the piston assembly must be
insertedfirst on the piston rod (Photo 4).
.
.the side
that
is entire/y metal. Replace the piston spacer, the piston
Tighten with a torque wrench to
60
in-lb. Always use a
retainer, cup washer and the piston retainer nut.
new cotter pin! After cups have been replaced.
lubricate with a thin film of oil so cupswill tie lubricated
before liquid enters the cylinders.
Check condition of cylinder interior walls. If chrome
plating is scored, worn or etched,
it
will cause rapid
wearing of piston cups. Replacewithnewcylindersand
cylinder O-rings.
Replace the manifold studs as they were originally
oriented. Reinstall cylinders by inserting them first into
the discharge manifold and then positioning the
manifold and cylinder assembly back on the pump.
Do
slipping the cylinders into the manifolds. Replace the
not extrude or
damage the cylinder O-rings when
lock washers and nuts. Tighten with
a
torque wrench to
125 in-lb.
PISTON SPACER
~
I
PUMPING SECTION CUTAWAY
801-237
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