BLACKMER IOM E Series, Installation, Operation & Maintenance Manual, Page: 46 / 52

1901-a00 46
S E C T I O N 8
Troubleshooting
SYMPTOM OR PROBLEM: PUMP IS EXCESSIVELY NOISY
Problem Cause(s):

Air in the inlet fluid stream

Relief valve is opening
 Pump has decoupled

Pump components are damaged or worn

Pump is cavitating

Discharge line is too restrictive
 Cooling path is plugged

Ball bearings are worn or damaged
SYMPTOM OR PROBLEM: PUMP DOES NOT PRIME
Problem Cause(s):
 Discharge line is too restrictive

Suction lift is too great

Pump is not wetted
 Air leak in the suction line

Pump is running in the wrong direction

Head is positioned incorrectly
 Cooling-path plugs are not installed

Pump is locked up with hardened fluid or foreign items

Pump components are damaged or worn
 Pump has decoupled

Inner magnets have weakened

Cooling path is plugged

Relief valve is stuck open
SYMPTOM OR PROBLEM: FLOW RATE IS TOO LOW
Problem Cause(s):

Head is positioned incorrectly

Cooling-path plugs are not installed
 Discharge line is too restrictive

Viscosity is lower than expected

Air in the inlet fluid stream
 Pump is cavitating

Relief valve is opening

Pump components are damaged or worn

Bypass or auxiliary line in the discharge piping is open
 Cooling path is plugged

Relief valve is stuck open