Gorman-Rupp Pumps PA4A60C-F3L 1303165 and up - Manual (Page 45)

OM−05765 PA SERIES
MAINTENANCE & REPAIR PAGE E − 23
(Figure 9)
Install the shaft key (23, Figure 5) in the shaft key-
way. Position the flexible portion of the coupling as-
sembly (3) on the shaft as shown in Figure 5.
NOTE
The flexible portion of the coupling must be proper-
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 just flush with the end of the
shaft. This positioning is critical. If the
coupling is not properly positioned on the
shaft, the coupling parts may not fully en-
gage, 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 allow the
two portions of the coupling to fully engage
when the intermediate is secured to the en-
gine 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 (4
and 5), 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 (20, Figure 5) and
secure the mounting flange to the engine bellhous-
ing with the previously removed hardware (6 and
7).
(Figure 3)
Use a suitable hoist and sling to position the air
compressor assembly (8) on the mounting flange
(18, Figure 5). Slide the belt (9) over the air com-
pressor sprocket. Use a pry bar to raise the com-
pressor high enough to install the spacers (20) be-
tween the compressor and the mounting flange.
Secure the compressor to the mounting flange
with the hardware (17, 18 and 19). Reinstall the
guard (10) and secure it with the hardware (11, 12
and 13).
Seal Reassembly and Installation
(Figures 5, 12, 13 and 14)
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.