Gorman-Rupp Pumps V6A60-B 1321070 and up - Manual (Page 36)

OM−05817 ULTRA V SERIES
MAINTENANCE & REPAIR PAGE E − 14
USE TWO REMAINING
ADJUSTING SCREWS AND
LOCKING COLLARS TO
SET FACE CLEARANCE
USE TWO
OPPOSING
BACK COVER NUTS
TO PRESS
BACK COVER
INTO PUMP
CASING
INDEX COLLARS 3
DETENTS COUNTER-
CLOCKWISE, THEN
TURN CLOCKWISE
UNTIL SCREW
HOLES ALIGN
Figure 7. Installing and Adjusting Back Cover
Screw the four adjusting screws (14) into the
tapped holes in the back cover plate until they are
just flush with the machined surface on the back
side of the cover plate.
Align the back cover plate over the studs (5) and
slide it into the pump casing. Use two back cover
nuts (16) on diagonally opposing studs to press
the back cover into the pump casing until the wear
plate just touches the impeller when the shaft is
turned by hand. Tighten the back cover nuts
evenly to avoid binding.
With the wear plate just touching the impeller, turn
the two free adjusting screws until they engage the
pump casing. Position the locking collars over the
adjusting screws so the holes in the collars for the
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
(13 and 15). 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 (13 and 15). 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 spacers (32).
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.
Suction Check Valve Installation
(Figure 1)
Inspect the check valve assembly (24) and replace
it if badly worn.
Position the check valve in the mounting slot in the
pump casing (1) with the G-R" logo facing away
from the inside of the pump casing. Position the
check valve cover (25) over the check valve slot
and secure with the hardware (9 and 26).
NOTE
If the suction or discharge flanges were removed,
replace the respective gaskets, apply ‘Permatex
Aviation No. 3 Form-A-Gasket’ or equivalent com-
pound to the mating surfaces, and secure them to
the pump casing with the attaching hardware.
PRESSURE RELIEF VALVE
MAINTENANCE
(Figure 1)
The back cover is equipped with a pressure relief
valve to provide additional safety for the pump and
operator (refer to Liquid Temperature And Over-
heating in OPERATION).