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the hand without damage to the bearing. Outside
temperature of the housing should not exceed 130° F
for long bearing life.
PUMP SHAFT SEALS
Shaft Seals:
The oil cavity is accessible for filling and draining of
the oil cavity from the exterior of the volute casing.
The oil in the seal chamber should be checked every
six months or every three months if water-containing
abrasives are being pumped. Remove hex head plug
from top of seal chamber and loosen hex plug at
bottom of seal chamber. Place a container under the
lower plug then remove lower plug and allow oil to
drain into container. After all oil is removed, pour used
oil into a glass container so that it can be observed.
If the oil is clean, it will indicate seals are in good
condition. If a small amount of water shows in the oil,
this will also indicate satisfactory seal operation. If
considerable water and some dirt shows in the oil, it
will indicate the inboard seal is worn and should be
replaced before outboard seal is damaged. If seals
are in good order, refill the seal chamber with #30
nondetergent automotive oil. About 2 ½ quarts are
required. Fill with funnel or tube so that the air can
escape. Oil chamber must have a 1" air gap; do not
overfill oil chamber.
PUMP TROUBLESHOOTING
WARNING: If pump has overheated, allow pump to
cool before servicing. Do not remove plates, cover,
gauges or fittings from an overheated pump. Liquid
inside the pump case can reach the boiling point,
and vapor pressure within the pump case may cause
parts to be ejected with great force. Drain pump case
only after pump has been allowed to cool. Use care to
prevent personnel from touching the hot liquid.
Pump will not prime:
1. Pump discharge does not have air bleed line
installed. See pump installation instructions for
air bleed line.
2. Vertical suction lift is too high. Vertical lift for
priming should not be more than 20 feet.
3. Allow sufficient time for priming. On high lifts and
at low pump speeds priming time may take five
minutes or longer.
4. Suction line has an air leak. Install a vacuum
gauge at pump suction flange and start pump.
After a vacuum is established, stop pump and
see if gauge holds. If gauge hand drops, it will
indicate an air leak at some connection below the
gauge tap.
5. Check pump rotation. Pump must turn clockwise
when looking at the power end of pump.
6. Not enough liquid in pump casing. Add water to
the case. Pump needs water in the pump case
to prime.
7. Suction check valve damaged or contaminated.
Replace check valve.
8. Leaking or worn seal or pump gasket. Check
pump case vacuum; replace leaking or worn
seals or gaskets.
Pump primed OK initially but occasionally loses
prime and will not reprime without adding water:
IMPORTANT: Drain pump case and close discharge
gate valve before removing inspection cover.
1. Air bleed line is not installed properly as specified
or is plugged. See installation instructions.
2. Check priming port for plugging. Remove
inspection cover on right side of case when
facing power end of pump. Check priming port
hole in case below inspection plate for plugging.
3. Impeller may be worn, leaving too much
clearance between impeller face and suction
wear plate. Adjust impeller as described under
adjusting instructions. If impeller and volute lip
plate are worn, they must be replaced to regain
original priming efficiency.
Pump makes a loud crackling noise
when operating:
1. If pump has been operating satisfactorily and this
noise suddenly starts, it may indicate that some
large object is lodged in the suction check valve,
suction cover/plate or impeller causing the pump
to be noisy. Remove debris from these areas of
the pump.
2. If noise exists when suction pipe, check valve
and suction cover port are clear, it may indicate
too high a capacity being delivered for a given
suction lift, causing suction cavitation. If pump
is allowed to operate under these conditions,
the impeller will be damaged. Using a smaller
impeller or reducing the pump speed if a belt
drive is used may alleviate the cavitation. Consult
factory for recommendations.
3. If cracking noise is pronounced when pump is
operating at low capacity it may indicate pump is
operating too near the shut-off head. Increasing
the impeller diameter or increasing pump speed
may alleviate this condition. Consult factory
for recommendations.
4. Performance curves show maximum/minimum
capacity that the pump will deliver at a given
condition point and the allowable suction lift
without cavitation. Use vacuum gauge at pump
suction to check total suction lift when pump
is operating. Use discharge pressure gauge at
pump discharge to check discharge head. Total
the two-gauge reading to determine the total
dynamic head the pump must operate against.
6
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