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Use grease on inside of rubber
seal unit. Use O-ring on shoulder
of shaft to prevent leakage under
sleeve.
Now replace lip plate and fasten
with screws. Put seal spring in
place and screw impeller onto
shaft.
Bump impeller against
sleeve using hardwood block on
impeller vane. Now replace lock
washer and screw. Use Locktite
on threads of locking screw.
Reassemble unit in pump casing.
CAUTION:
Never reuse old
seal parts. Always replace with
complete new seal.
Seal faces should be lubricated
with a non-detergent motor oil.
Complete
Rotating
Simplifies Maintenance:
The complete rotating unit includes
motor, bracket, seal, volute lip
plate and impeller. All can be
easily removed from the pump as
an integral unit without disturbing
the pump case or system piping.
This simplifies the replacement of
worn impellers, volute lip plates
and shaft seals.
Quick Clean-Out:
If the pump should clog due to the
intrusion of rags or other stringy
material, pump may be unclogged
in minutes by loosening four wing
bolts and removing suction elbow.
This completely exposes impeller
and pump case interior. No need
to disconnect other piping.
Pump
Troubleshooting
WARNING:
Read all the
instructions before starting any
operation on pump.
disconnect
the
pump
controls from its power source
before handling. Do not smoke
or use sparkable electrical
devices or flame in a septic
(gaseous) or possible septic
sump.
Pump will not prime.
1. Pump case has not been filled
with water.
2. Motor rotation may be wrong.
Rotation is clockwise when
standing behind the motor.
3. Vertical suction lift may be
too high. Dry prime heights
are given on the curve sheets
of the MPC pumps.
4. Suction line may have an air
leak. Use vacuum gauge at
pump inlet to check for leak.
Unit
Start pump and watch gauge.
As pump primes gauge hand
goes up, stop pump and see
if hand will hold position.
If hand falls back, a suction
leak is indicated. Recheck all
suction threads and gaskets.
5. Check for obstruction in
impeller. Remove inlet elbow
to check.
6. Air bleed line may be plugged.
Water and air should vent into
sump.
Pump occasionally loses prime
and pump case gets hot.
1. Air bleed lines may be
plugged.
2. Inlet check valve may be worn
or broken.
suction opening when elbow
is removed. Replace if worn
or broken.
3. The priming port may be
plugged. Priming port extends
from upper case into volute
chamber.
Always
4. Impeller face clearance and
and
lip clearance may be too great
Pump makes a cracking noise
when operating.
1. Suction line may be partially
2. Pump may be delivering too
3. Pump may be operating too
Pump does not deliver rated
capacity.
1. Total head may be higher
Inspect through
2. Pump impeller may be worn.
3. Suction lift may be too high.
due to wear. Impeller and lip
plate should be replaced if
obvious wear is present.
blocked. Use vacuum gauge
at pump inlet. If high reading
shows above 25 ft., check for
pluggage in suction pipe.
much capacity due to reduced
or miscalculated head, causing
pump to cavitate. Reducing
impeller diameter will help
this condition. If necessary to
reduce impeller diameter both
impeller and lip plate must
be replaced.
Use vacuum
gauge to determine maximum
suction lift.
near to shut-off capacity
due to head being higher
than calculated. At reduced
capacity under 100 GPM, all
self-priming pumps tend to
be noisy. Pumps should not
be selected to operate at this
range. Performance curve on
MPC pumps show operating
range enclosed by heavy line.
For quiet operation pump must
be operated within this range.
than estimated. Total head is
taken when pump is operating.
This is vacuum gauge reading
in feet plus discharge gauge
reading in feet.
Replace impeller and lip plate
if obvious wear shows when
suction elbow is removed.
Check curve for maximum
total suction lift. If suction
5
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