Gorman-Rupp Pumps T6A60S-4045T 1443416 and up - Manual (Page 47)

OM-06183 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E - 20
locking screws align approximately with the holes
in the cover plate.
Loosen the back cover nuts used to press the back
cover into the pump casing one full turn.
Pull the collars off the adjusting screws, index them
three detents counterclockwise, and reinstall the
collars on the adjusting screws. Use the collars to
turn the adjusting screws clockwise until the holes
in the locking collars realign with the tapped screw
holes in the back cover plate. Secure the locking
collars to the back cover plate with the hardware
(10 and 18). Install the two remaining back cover
nuts snugly against the adjusting screws.
Remove the first two back cover nuts from their
studs. Turn the adjusting screws clockwise until
they engage the pump casing. Install the locking
collars and hardware (10 and 18). Reinstall the
back cover nuts.
Be sure the wear plate does not scrape against the
impeller.
Over time it may be necessary to repeat the adjust­
ment process to compensate for normal wear be­
tween the impeller and wear plate. When all of the
adjustment has been used on the back cover side
of the pump, an additional 0.125 inch (3,2 mm) of
adjustment may be obtained by removing the ro­
tating assembly adjusting shims (11).
Allow an installed pump to completely cool before
draining liquid from the pump casing. Remove the
back cover. Remove the rotating assembly adjust­
ing shims, then reinstall the hardware securing the
rotating assembly to the pump casing. Perform the
back cover adjustment procedure described
above to obtain the proper face clearance.
Securing Pump End To Engine
(Figure 5)
Install the shaft key (17, Figure 4) in the shaft key­
way. Position the flexible portion of the coupling as­
sembly (3) on the shaft as shown in Figure 5.
Align the keyway in the bushing (2) with the shaft
key, and slide it onto the shaft to the dimension
shown in Figure 5. 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 setscrews.
Make certain that the flexible portion of the
coupling is mounted as shown in Figure 5.
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 protrude 1.25
inch (32 mm) from the face of the bush­
ing. This will allow the two portions of the
coupling to fully engage when the drive
flange is secured to the engine bellhous­
ing, 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 14.6 ft. lbs. (175 in. lbs. or 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 pump
end so the flexible portion of the coupling seats in­
side 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 (16, Figure 4), and
secure the drive flange to the engine bellhousing
with the hardware (6 and 7).