| Trouble |
Probable Cause and Remedy |
|
|
-
Low pump
temperature: check thermocouple and control loop for proper
setting or operation. Allow sufficient heat-up time.
-
Drive
malfunction: verify that drive powered. Assure all alarm
circuits are clear. Check drive motor current and speed
settings. Check drive couplings.
-
Process
conditions changed: check process conditions for proper melt
temperature, pressures, viscosities, and materials.
-
Entrained
particle: disassemble and clean pump. Replace any damaged
parts.
-
Possible internal
damage: disassemble and clean pump. Replace any damaged
parts. Consult factory.
|
- Excessive seal assembly leakage
|
- Worn seal plate: replace seal
plate and coupling if necessary.
- Drive shaft bottoming in coupling
slot: readjust drive shaft.
- Insufficient inlet pressure:
increase inlet pressure.
- Worn packings *:
replace packings. * A minor seal leak or
weep is not abnormal and may be desirable for lubricating the seal
surfaces.
|
|
|
- Worn gear(s): replace worn gear(s).
- Worn bearings: replace worn
bearings.
- Process conditions changed:
consult factory for clearance recommendations on new process
conditions.
|
