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3. Install the snap ring (#4) in
the pump end of the pedestal. Be
sure the snap ring is seated properly
in the groove. The beveled edge of
the ring should face away from the
bearing.
4. Install the flinger over the snap ring.
The bearing pedestal is now ready
for pump and motor installation.
*Alternate bearing installation proce-
dures.
If an arbor press is not available, the
bearings may be installed on the shaft
using the following procedure:
This procedure is not recommended and
should only be used in an emergency
situation.
Figure 5-8
1. Stand a piece of 3/4" pipe,
with the threads cut off, on a work-
bench or similar flat surface, with the
bearing placed on the correct shaft
end.
2. Insert the shaft into the pipe so the
bearing is between the pipe and the
shoulder of the shaft. Refer to Figure
5-9.
3. Using extreme caution, gently tap on
the end of the shaft until the bearing
rests against the shoulder. Never
attempt to install the bearings by
striking the outer race.
4. Repeat step 3 for the other bearing.
Figure 5-9
T31 SERIES
Troubleshooting
leads on a three phase motor to
change rotation. Check motor name-
plate for single phase operation.
6. Clogged suction line, strainer, or foot
valve —
Inspect and clean out if necessary.
7. Air pocket in suction line —
Look for high spots in inlet piping
system. Evacuate the system with a
vacuum pump if necessary.
6B Reduced Capacity
1. Pump not up to speed —
Use a tachometer to determine actual
RPM. Check voltage and wiring con-
nections.
2. Excessive suction lift —
Relocate pump, supply tank, or both
to minimize suction lift.
3. Insufficient NPSH —
Relocate pump, supply tank, or
both to improve NPSH available if
possible. Increase suction pressure.
Reduce fluid temperature. Select a
pump with lower NPSH requirements.
4. Mechanical damage —
Rotate the pump by hand to deter-
mine if there are tight spots. Broken
or bent impeller vanes can some-
times be noticed in this manner. If
there is suspicion of damage, remove
the pump from service and disassem-
ble for inspection.
5. Air leak in the suction line —
Fill the system with fluid and hydro
-
statically test. Tighten connections or
replace leaky components.
6. Air pockets in the suction piping —
Operating the system at maximum
flow conditions will usually clear the
lines. Evacuate the system with a
vacuum pump if necessary.
7. Suction lines, strainer, or foot valve
too small or clogged —
Inspect and clean out as necessary.
Fittings and lines should be at least
equal to the pump suction size.
8. Discharge head too high —
Install a pressure gauge at the pump
discharge to determine the actual
operating pressure. Compare read-
ings with pump performance curve. A
larger pump may be necessary.
9. Excessive wear —
If a pump had previously performed
satisfactorily and now gives evidence
of reduced performance, it should be
disassembled and examined for wear
after the simpler possible problems
have been pursued.
6C Reduced Pressure
1. Pump not up to speed —
Use a tachometer to determine actual
RPM. Check voltage and wiring con-
nections.
6.
CLOSE COUPLED PUMPS
A.
Failure to Pump
B.
Reduced Capacity
C.
Reduced Pressure
D.
Pump Loses Prime After Starting
E.
Excessive Power Consumption
F.
Pump Vibrates or is Noisy
G.
Mechanical Problems
H.
Seal Leakage
6A Failure to Pump
1. Pump not up to speed —
Use tachometer to determine actual
RPM. Check voltage and wiring con-
nections.
2. Pump not primed —
Confirm that pump and all inlet piping
is filled with fluid.
3. Discharge head too high —
Install a pressure gauge at the pump
discharge to determine the actual
operating pressure. Compare read-
ings with pump performance curve. A
larger pump may be necessary.
4. Excessive suction lift —
Relocate pump, supply tank, or both
to minimize suction lift.
5. Wrong direction of rotation—
Compare pump rotation with arrow
on pump. Standard pumps rotate in
a counterclockwise direction when
looking at the shaft extension end.
Clockwise from the motor end on
close coupled pumps. Reverse two
5E Testing and Final Adjustments
1. Check to be sure that the
rotating assembly turns freely. Turn
the shaft by hand. If it is tight or
rough spots are encountered, it is
likely that at least one of the bearings
was damaged during disassembly/
assembly operations and will have to
be replaced.
2. Look to make sure that the lip seals
on the bearings are
positioned
properly in their grooves. Correct
if necessary. As the bearings are
turned, the grooves should
appear wet with oil but have no vis-
ible grease present.
3. Recheck the snap ring on
the large bearing end. It should be
firmly in place, and no axial motion
should result from gentle tapping
on either end of the shaft. (Use a
soft mallet so shaft surfaces are not
damaged.)
4. No adjustments are possible or
required. Proceed with the appropri-
ate pump end assembly operations.
Refer to Section 5 SERVICE - PUMP
ENDS (Final testing is done after
the pump end is in place.)
