Gorman-Rupp Pumps V3A60-B 1321968 and up - Manual (Page 35)

OM−05815 ULTRA V SERIES
MAINTENANCE & REPAIR PAGE E − 13
Slide the rotating portion of the seal (consisting of
the integral shaft sleeve, spring centering washer,
spring, bellows and retainer, and rotating element)
onto the shaft until the seal faces contact.
Proceed with Impeller Installation and Adjust-
ment.
Impeller Installation And Adjustment
(Figure 2)
Inspect the impeller, and replace it if cracked or
badly worn. Inspect the impeller and shaft threads
for dirt or damage, and clean or dress the threads
as required.
The shaft and impeller threads must be
completely clean before reinstalling the im-
peller. Even the slightest amount of dirt on
the threads can cause the impeller to seize
to the shaft, making future removal difficult
or impossible without damage to the im-
peller or shaft.
Install the same thickness of impeller adjusting
shims (2) as previously removed. Apply ‘Never-
Seez’ or equivalent to the shaft threads and screw
the impeller onto the shaft until tight.
NOTE
At the slightest sign of binding, immediately back
the impeller off, and check the threads for dirt. Do
not try to force the impeller onto the shaft.
A clearance of .025 to .040 inch (0,64 to 1,02 mm)
between the impeller and the seal plate is recom-
mended for maximum pump efficiency. Measure
this clearance, and add or remove impeller adjust-
ing shims as required.
Proceed with Rotating Assembly Installation be-
fore installing the impeller capscrew and washer
(26 and 27). The rotating assembly must be in-
stalled in the pump casing in order to torque the im-
peller capscrew.
After the rotating assembly is installed in the pump
casing, coat the threads of the impeller capscrew
(27) with ‘Never-Seez’ or equivalent compound,
and install the impeller washer (26) and capscrew;
torque the capscrew to 90 ft. lbs. (1080 in. lbs. or
12,4 m. kg.).
Rotating Assembly Installation
(Figure 1)
Install the O-rings (8 and 11) and lubricate them
with light grease. Ease the rotating assembly into
the pump casing using the installation tool. Be
careful not to damage the O-ring.
Install the rotating assembly adjusting spacers
(35) and secure the rotating assembly to the pump
casing with the hardware (14 and 34).
To set the impeller and wear plate clearance, refer
to the Back Cover Installation And Adjustment.
Back Cover Installation And Adjustment
(Figures 1 and 8)
If the wear plate (7) was removed for replacement,
carefully center it on the back cover and secure it
with the hardware (9 and 10). The wear plate must
be concentric to prevent binding when the back
cover is installed.
Clearance between the impeller and wear plate is
adjusted using four adjusting screws and locking
collars. There are 18 detents on the I.D. of each
locking collar (13). Indexing the collars one detent
on the adjusting screws represents approximately
.005 inch (0,13 mm) of wear plate clearance. The
recommended clearance between the wear plate
and the impeller is .010 to .020 inch (0,25 to 0,50
mm).
Replace the back cover O-rings (8 and 11) and lu-
bricate them with a generous amount of No. 2
grease. Clean any scale or debris from the contact-
ing surfaces in the pump casing that might inter-
fere or prevent a good seal with the back cover.