Gorman-Rupp Pumps PA6C60C-F6L 1477478 and up - Manual (Page 43)

OM−05771 PA SERIES
MAINTENANCE & REPAIR PAGE E − 21
Lubricate the bearings as indicated in LUBRICA-
TION at the end of this section.
Securing Bearing Housing And Drive Assembly
To Engine
(Figure 4)
Install the key (30 Figure 5) in the shaft keyway,
making sure to leave room in the keyway for the
drive key (31, Figure 5). Install the bushing (10) and
sheave (11) on the shaft to the dimension shown in
Figure 10.
Figure 10. Compressor Drive Sprocket
Positioning
NOTE
When properly installed to the dimension shown in
Figure 9, the key (30, Figure 3) 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.) max. Install the 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 (1) 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 to the dimension
listed below. Rotate the flexible portion of the cou-
pling until the tapped holes for the two setscrews
align with those in the bushing, and install the set-
screws.
Make certain that the flexible portion of the
coupling is mounted as shown in Figure 8.
This dimension is critical. If the coupling
is not properly 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 1.44
inch (37 mm) from the end of the shaft.
This will allow the two portions of the cou-
pling to fully engage when the intermediate
is secured to the engine bellhousing, with-
out 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 ft. lbs. (280 in. lbs. or 3 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 (6
and 7) 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.).
Position the bellhousing adaptor ring (not shown)
on the studs (8) against the engine bellhousing.
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.