OM-05670
SUPER U SERIES
MAINTENANCE & REPAIR
PAGE E - 13
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 (26) 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 .015 to .030 inch (0,38 to 0,76 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.
Proceed with
Rotating Assembly Installation
be
fore installing the impeller capscrew and washer (7
and 8). The rotating assembly must be installed in
the pump casing in order to torque the impeller
capscrew.
After the rotating assembly is installed in the pump
casing, coat the threads of the impeller capscrew
(8) with `Never‐Seez' or equivalent compound, and
install the impeller washer (7) and capscrew;
torque the capscrew to 90 ft. lbs. (1080 in. lbs. or
12,4 m. kg.).
Rotating Assembly Installation
(Figure 1)
A repair rotating assembly is shipped dry
of lubricant. Refer to
lubricatioon
at the
end of this section before installing a repair
rotating assembly.
Install the bearing housing and seal plate O‐rings
(23 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‐rings.
Install the pump casing ring (3), and secure it to the
rotating assembly with the inner hardware (5 and
7).
NOTE
The inner capscrews are 1/4 inch (3,2 mm) shorter
than the outer capscrews.
Install the rotating assembly shims (39) under the
volute ring, and secure the ring to the pump casing
with the outer hardware (5 and 6).
To set the impeller and wear plate clearance, refer
to the
Back Cover Installation And Adjustment
.
Suction Check Valve Installation
(Figure 1)
Inspect the check valve assembly (30), and re
place it if badly worn.
NOTE
The check valve assembly must be replaced as a
complete unit. Individual parts are not sold sepa
rately.
Reach through the back cover opening with the
check valve and position the check valve adaptor
in the mounting slot in the suction flange (16). Align
the adaptor with the flange hole, and secure the as
sembly with the check valve pin (31).
