OM-07328
SUPER T SERIES
MAINTENANCE & REPAIR
PAGE E - 13
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 anti-
seize (G‐R P/N 18685-031) to threads. Install and
fully tighten impeller prior to installing impeller
washer and capscrew.
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
(21 and 22). 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
(25) with thread locker (G-R P/N 18771-109) and
install the impeller washer (26) and capscrew;
torque the capscrew to 27-30 ft. lbs. (324-360 in.
lbs. or 3,7-4,1 m. kg.).
Rotating Assembly Installation
(Figure 1)
NOTE
If the pump has been completely disassembled, it
is recommended that the back cover assembly be
reinstalled at this point. The back cover assembly
must be in place to adjust the impeller face clear
ance.
Install the O‐rings (4 and 8) in the grooves in the
seal plate and bearing housing and lubricate them
with light grease. Slide the rotating assembly into
the pump casing using the installation tool.
Be
careful
not to damage the O‐ring.
Install the same thickness of rotating assembly ad
justing shims (33) as previously removed and se
cure the rotating assembly to the pump casing with
the hardware (14 and 15).
A clearance of .010 to .020 inch (0,25 to 0,51 mm)
between the impeller and the wear plate is also rec
ommended for maximum pump efficiency. This
clearance can be obtained by removing an equal
amount of shims from each rotating assembly
shim set until the impeller scrapes against the wear
plate when the shaft is turned by hand. After the im
peller scrapes, add approximately .015 inch (0,4
mm) of shims to each shim set.
Suction Check Valve Installation
(Figure 1)
Inspect the check valve assembly (26) and replace
it if badly worn.
NOTE
The check valve assembly must be replaced as a
complete unit. Individual parts are not sold sepa
rately.
Position the check valve in the mounting slot in the
pump casing (1) with the grooves in the rubber to
ward the inside of the pump. Secure the assembly
with the check valve cover (27) and the hardware
(28 and 29)
NOTE
If the suction or discharge flanges were removed,
replace the respective gaskets, apply `Permatex
