PA SERIES PUMPS
MR--04835
MAINTENANCE & REPAIR
PAGE C -- 14
Secure the intermediate to the engine bellhousing
with the previously removed hardware (12 and 13).
Pump Casing Installation
(Figure C--2)
If the balance ring (40) was removed, position the
replacement ring in the casing bore with the cham-
fered end toward the bore shoulder. Press the ring
into the casing until it seats squarely against the
casing shoulder.
The balance ring
must
seat squarely in the
suction head; otherwise binding and/or ex-
cessive wear will result.
NOTE
The stationary seat and O-ring for the shaft seal as-
sembly may be installed in the pump casing before
the casing is secured to the intermediate (see
Seal
Reassembly and Installation
). If the stationary
seat is installed,
be careful
not to damage it on the
shaft threads.
Position the pump casing over the shaft and
against the intermediate. Secure the casing to the
intermediate with the hardware (35 and 36).
Install any leveling shims used under the pump
casing mounting feet and secure the pump casing
to the base with the previously removed mounting
hardware.
Seal Reassembly and Installation
(Figures C--2 and C--4)
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
The seal is not normally reused because wear pat-
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If necessary to reuse an old seal in an emer-
gency,
carefully
wash all metallic parts in
fresh
cleaning solvent and allow to dry thoroughly.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shorten seal life. If necessary, clean the faces with a
non-oil based solvent and a clean, lint-free tissue.
Wipe
lightly
in a concentric pattern to avoid
scratching the faces.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak-
age. Clean and polish the shaft sleeve, or replace it
if badly worn. If any components are worn, replace
the complete seal;
never mix old and new seal
parts
.
If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
matter.
To ease installation of the seal, lubricate the sta-
tionary seat O-ring, bellows and shaft sleeve with
water or a very
small
amount of oil, and apply a
drop of light lubricating oil on the finished faces.
Assemble the seal as follows, (see Figure C-5).
