Gorman-Rupp Pumps PA4E71C-3TNV88-SE 1416614 and up - Manual (Page 52)

PA SERIES OM−06244
MAINTENANCE & REPAIR PAGE E − 30
Align the keyway in the bushing (7) with the bush-
ing key, and slide it onto the shaft to the dimension
shown in Figure 13. Rotate the flexible portion of
the coupling until the tapped holes for the two set-
screws align with those in the bushing, and install
the capscrews.
Make certain that the flexible portion of the
coupling is mounted as shown in Figure
13. This dimension is critical. If the cou-
pling 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 extend 1.38
inches (35 mm) from the face of the cou-
pling. This will allow the two portions of the
coupling to fully engage when the interme-
diate 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 capscrews in an alternating sequence until the
bushing and coupling are fully secured. Torque the
capscrews to 9 ft. lbs. (108 in. lbs. or 1,2 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 secure the outer ring of the coupling to the
engine flywheel by torquing the hardware to 16 ft.
lbs. (192 in. lbs. or 2,2 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 (17, Figure 10), and
secure the mounting flange to the engine bellhous-
ing with the previously removed hardware (3 and
4).
(Figure 9)
Use a suitable hoist and sling to position the air
compressor (57) on the mounting flange (20, Fig-
ure 10) and secure it to the mounting flange with
the previously removed hardware (14, 56 and 82).
Slide the cog belt (71) over the air compressor driv-
en sprocket (60). Turn the uppermost nuts (17) on
the threaded rods (75) evenly in a cross pattern to
tighten the cog belt on the sprockets. Do not over-
tighten the cog belt.
NOTE
Tension on the cog belt should be enough so the
belt feels snug or taut. Avoid over-tensioning the
belt. To check belt tension, finish reassembling the
pump, then start the unit. A belt that is too loose will
jump teeth" under load. If this occurs, gradually in-
crease the belt tension until satisfactory operation
is achieved.
Reinstall the guard (64) and secure it with the hard-
ware (14, 22, 56 and 65).
(Figure 6)
Re-connect the lines for the drain assembly (90) to
the drain ports in the bearing housing (29, Figure
10). Be sure to connect the correct drain line to the
corresponding drain port (seal or bearing cavity).
Seal Reassembly and Installation
(Figures 10, 15, 16 and 17)
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,