Service manual

TROUBLESHOOTING
Under each fault symptom given below is a list of recommended inspections that could indicate the
cause, most are elementary but are often overlooked.
The best aid to fault finding in the pump is a vacuum gauge as close as possible to the pump inlet.
This can readily indicate whether the imposed suction is within the pumps capability, or if there has
been a dramatic change from the conditions, which will indicate a change in the viscosity of the
pumping media, resulting in higher pressure loss in the suction line, or that a filter requires
cleaning, etc.
No liquid delivered or the pump will not prime.
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Check Direction of shaft rotation.
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Are suction line joints leaking in air?
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Total suction condition, is there su"cient N.P.S.H. available?
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Has the pump been properly primed before start-up?
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Is suction port blocked? Is filter clean?
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All valves in system are open?
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Is the discharge line vented? Pressure build-up will ultimately prevent suction vacuum!
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If the vacuum gauge is reading over 20inHG there is almost certainly a blockage in the suction.
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Is the material hot enough? EVERYWHERE?
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If you have a screen box, add 3 gallons of suitable liquid to help establish prime.
Pump noisy when operating
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A low growling sound is normal for new pump. The noise is attributed to the meshing of the
hardened gears. The pump will tend to be louder when turning empty and will quiet down once
liquid prime is established.
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A loud clacking can be an indication that the pump is cavitating. Look for signs of inlet flow
restrictions or lower than normal material temperature. As a last resort, slow pump speed until
noise goes away.
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Pump internals are worn.
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Debris in material. Add screen box.
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Misalignment of drive system.
BearCat Pumps, LLC
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