WAUKESHA Manuale Inglese UNIVERSAL 1 - Asco Pompe Srl

Problem Probable Causes Solutions
Noisy operation
Pump requires excessive
power (overheats, stalls,
high current draw, breakers
trip)
Rotor to body contact
1. Distortion of pump due to
improper piping installation.
2. Pressure higher than rated.
3. Worn bearing.
4. Worn gears.
Rotor to rotor contact
1. Loose or mis-timed gears,
twisted shaft, sheared keys, worn
splines.
Relief valve chattering
Drive component noise-gear
trains, chains, couplings,
bearings.
1. Higher viscous losses than
expected.
2. Higher pressure than expected.
Fluid characteristics.
1. Fluid colder than expected,
viscosity high.
2. Fluid sets up in line and pump
during shut down.
3. Fluid builds up on pump surfaces
(example, latex, chocolate,
fondants).
1. Reassemble pump or re-install
piping to assure free running.
2. Reduce pressure if possible.
3. Rebuild with new bearings.
Lubricate regularly.
4. Rebuild with new gears.
Lubricate regularly.
1. Rebuild with new parts.
Re-adjust, repair or replace.
Repair or replace drive train.
1. If within pump rating, increase
drive size.
2. Reduce pump speed. Increase
line sizes.
1. Heat fluid. Insulate or heat trace
lines. Use pump with more
running clearances.
2. Insulate or heat trace line. Install
“soft start” drive. Install
recirculating bypass system.
Flush with other fluid.
3. Use pump with more running
clearance.
Section 4 - Troubleshooting a Pumping System January 2006
Page 14 95-03002