OM-07323
PA SERIES
MAINTENANCE & REPAIR
PAGE E - 21
ly positioned on the shaft. The heads of the caps
crews in the center of the coupling
must be posi
tioned away from the pump
.
Align the keyway in the bushing (2) with the shaft
key, and slide it onto the shaft until the face of the
bushing is just flush with the end of the shaft. Ro
tate the flexible portion of the coupling until the
tapped holes for the two setscrews align with those
in the bushing, and install the setscrews.
Make certain that the flexible portion of the
coupling is mounted as shown in Figure 8.
This is critical.
If the coupling is not prop
erly positioned on the shaft, the coupling
parts may not fully engage, or a pre‐load
condition can cause premature bearing
failure.
The end of the shaft must be just flush
with the face of the bushing.
This will al
low the two portions of the coupling to fully
engage when the engine bracket is
secured to the engine bellhousing without
pre‐loading the bearings.
With the flexible portion of the coupling and the
bushing properly positioned on the shaft, tighten
the two setscrews in an alternating sequence until
the bushing and coupling are fully secured. Torque
the setscrews to 23.3 ft. lbs. (280 in. lbs. or 3,2 m.
kg.).
If the complete coupling assembly is being re
placed, apply `Loctite Retaining Compound No.
242' or equivalent to the threads of the hardware (5
and 6), and secure the outer ring of the coupling to
the engine flywheel by torquing the hardware to 45
ft. lbs. (540 in. lbs. or 6,2 m. kg.).
Using a suitable lifting device, position the as
sembled drive and rotating assembly so the flex
ible portion of the coupling seats inside the outer
ring attached to the engine flywheel.
NOTE
To ease installation,
lightly
lubricate the rubber por
tion of the coupling with a
non‐petroleum based
lubricant
such as vegetable oil or glycerin, or a sili
con‐based lubricant such as “WD40” or equivalent.
Do not
use petroleum‐based lubricants, or any oth
er substance which may soften or otherwise dam
age the rubber.
Install the intermediate guards (25, Figure 5) and
secure the bearing housing to the engine bellhous
ing with the previously removed hardware (7 and
8).
Seal Reassembly and Installation
(Figures 5, 10, 11 and 12)
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.
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent. Inspect the stationary
seat bore in the seal plate for dirt, nicks and burrs,
and remove any that exist. The stationary seat bore
must
be completely clean before installing the
seal.
A new seal assembly should be installed
any time
the old seal is removed from the
pump. Wear patterns on the finished faces
cannot be realigned during reassembly.
Reusing an old seal could result in prema
ture failure.
To ease installation of the seal, lubricate the shaft
sleeve O‐ring and the external stationary seat O‐
ring with a very
small
amount of “P-80
Emul
sion” or water. See Figure 10 for seal part identifica
tion.
