Gorman-Rupp Pumps PA6C60C-F6L 1423057 thru 1477477 - Manual (Page 43)

OM−05771 PA SERIES
MAINTENANCE & REPAIR PAGE E − 21
Securing Bearing Housing And Drive Assembly
To Engine
(Figure 4)
Install the key (34 Figure 5) in the shaft keyway,
making sure to leave room in the keyway for the
drive key (35, Figure 5). Install the bushing (10) and
sheave (11) on the shaft to the dimension shown in
Figure 4.
NOTE
When properly installed to the dimenstion shown in
Figure 4, the key (34, Figure 5) will not extend fully
through the bushing. This is an acceptable fit for
this application.
Secure the bushing and sheave to the shaft by
torqueing the bushing screws to 23 ft. lbs. (280 in.
lbs. or 3,2 m. kg.) maximum. Install the adjustable
V-belt (9) over the sheave and up through the slot in
the mounting flange (9, Figure 5).
(Figure 8)
Install the shaft key (35, Figure 5) in the shaft key-
way. Position the flexible portion of the coupling as-
sembly (3) on the shaft as shown in Figure 8.
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 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 coupling must be positioned just
flush the end of the shaft. 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 36 ft. lbs. (430 in. lbs. or 5 m. kg.).
If the complete coupling assembly is being re-
placed, apply ‘Loctite Retaining Compound No.
242’ or equivalent to the threads of the capscrews
(6) and secure the outer ring of the coupling to the
engine flywheel with the hardware (6 and 7).
Torque the capscrews 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 (27, 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 (6) on the mounting flange
(9, Figure 5). Slide the adjustable V-belt over the air
compressor drive sheave. Use a pry bar to raise
the compressor high enough to install the spacers
(14, Figure 3) between the compressor and the
mounting flange. Secure the compressor to the
mounting flange with the hardware (8, 9 and 10).