Assembly Of Engine-Driven Pump - Piper APACHE PA-23-235 Service Manual

PIPER AZTEC SERVICE MANUAL
NOTE
Although the pump may still operate under conditions
where some of the parts exceed the wear limits, it
will probably be found that the pump is not producing
its rated capacity and, therefore, the system may not
be doing an adequate job. Therefore,
it is necessary
to repair or replace any parts that are not within the
stated limits.
6-32. ASSEMBLY OF ENGINE-DRIVEN PUMP. (Refer to Figure 6-17.) The seal
and seal rings should be soaked in the hydraulic (MIL-H-5606) fluid for two hours minimum
time before installation.
a. Replace drive shaft seal (4 or 5) into drive side seal bore. Be sure to in-
stall drive shaft seal, "back to back", as noted during disassembly.
b. Replace retainer ring (3) into drive side seal bore.
c. Install new "O" ring seal (9) on drive side.
d. Mate centerplate assembly (10) with drive side assembly (7) and align dowel
pins.
e. Install drive shaft (1) from engine side of drive side assembly.
f. Install secondary shaft (17) into centerplate.
Install drive and secondary
gears (19 and 18) onto drive and secondary shafts (1 and 17). Be sure the drive
pin counterbore on the drive gear faces the pump rear side.
Install drive pins.
g. Install the four studs (12) and new "O" ring seal (15) on the rear side as-
sembly (13).
h. Lightly oil gear teeth with hydraulic fluid before completing assembly.
i . Mate the rear side assembly (13) with the centerplate (10), using caution to
align the drive and secondary shafts with the respective
holes in the rear side
assembly.
j . Replace the four locknuts (8) on the studs (14) extending out of the drive side
flange that mates with the centerplate.
k. Replace the four socket head cap screws (12) that secure the rear side,
centerplate
and drive side assemblies together.
Torque the socket head cap
screws and locknut to 60 inch-pounds.
1. When the pump is assembled,
turn drive shaft by hand to make sure the
pump turns freely.
If there is any sticking or binding at all, disassemble
pump
and determine the trouble.
Do not apply power to the pump until it turns freely
by hand.
HYDRAULIC SYSTEM
Reissued: 2/18/81
2C9