Gorman-Rupp Pumps V4A60-D914L3 1459605 and up - Manual (Page 48)

OM−06289 ULTRA V SERIES
MAINTENANCE & REPAIR PAGE E − 21
the pipe should be slightly larger than the O.D. of
the shaft sleeve.
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
Adjustment.
Impeller Installation
(Figure 5)
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. Be sure the
seal spring seats squarely on the back side of the
impeller.
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.
NOTE
If the rotating assembly has been installed in the
pump casing, this clearance may be measured by
reaching through the priming port with a feeler
gauge.
Rotating Assembly Installation
(Figure 4)
NOTE
If the pump has been completely disassembled, it
is recommended that the suction check valve and
back cover assembly be reinstalled at this point.
The back cover assembly must be in place to adjust
the impeller face clearance.
Install the seal plate and bearing housing O-rings
(39 and 40) and lubricate them with light grease.
Ease the rotating assembly into the pump casing
using the installation tool. Be careful not to dam-
age the O-ring.
Install the rotating assembly spacers (38). Secure
the rotating assembly to the pump casing with the
hardware (11 and 36).
To set the impeller and wear plate clearance refer
to the Back Cover Installation And Adjustment.
Back Cover Installation And Adjustment
(Figures 4 and 12)
If the wear plate (5) was removed for replacement,
carefully center it on the back cover and secure it
with the hardware (7 and 8). The wear plate must
be concentric to prevent binding when the back
cover is installed.
The clearance between the impeller and wear plate
is adjusted using four adjusting screws (17) and
locking collars (16). There are 18 detents on the
I.D. of each locking collar. Indexing the collars one
detent on the adjusting screws represents approxi-
mately .005 inch (0,13 mm) of wear plate clear-
ance. 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 (6 and 9) and lubri-
cate them with a generous amount of No. 2 grease.
Clean any scale or debris from the contacting sur-
faces in the pump casing that might interfere or
prevent a good seal with the back cover.