Piper APACHE PA-23-235 Service Manual page 741

PIPER AZTEC SERVICE MANUAL
a.
Remove the four screws which secure the pump assembly to the motor assembly.
b.
Separate the motor assembly from the pump assembly.
NOTE
The drive motor is non-repairable.
If defective, replace with
new motor. Pump performance may be altered as a result of
installing a new motor assembly. Therefore, retest is necessary
and pressure relief valve adjustment may be required.
c.
Remove locknut, adjusting screw, spring and plunger from end of pump assembly.
d.
Insert a 3/16 inch diameter rod through the 1/2 inch tapped hole, from which the relief valve
adjusting screw was removed and through the center hole in the insert cover until the rotor is contacted.
Apply pressure to the rod with an arbor press to unseat and remove the pumping element from the pump
housing. (Refer to Figure 9-24.)
NOTE
To facilitate reassembly, index the relative position of the insert
cover to the insert. Also, note proper orientation of the two inlet
holes in the insert cover to assist in proper reassembly.
e.
Remove the screws which secure the insert cover to the insert and remove the cover.
f.
Remove the rotor, blade retaining ring and blades from the insert.
g.
To remove the shaft seal from the insert, clamp a simple fixture having a 15/16 inch diameter hole
5/8 inch deep, in a vise (A 15/16 inch socket wrench head may be used as a temporary fixture). Place the
insert into the fixture with the shaft seal end up (Refer to Figure 9-24). Using a small screwdriver inserted
in the shaft hole of the seal, pry the seal from the seal well. Use extreme caution to avoid damage to the
seal well area.
h.
Wash pump parts in clean solvent and dry with filtered compressed air.
9-76. INSPECTION AND REPAIR.
a.
Inspect those areas from which parts have been removed. Smooth nicks, scratches and burrs in
these areas to avoid damage to new seals.
b.
Replace "O" rings and seals which have been removed.
NOTE
For detailed inspection procedures and a table of wear limits,
refer to the Service Information Manual, Weldon Pump Model
No. 33959-3 available from The Weldon Tool Co., 3000 Woodhill
Road, Cleveland, Ohio 44104.
FUEL SYSTEM
3K16
Reissued: 2/18/81
3K16