Instruction manual

5. Trouble shooting
Pump problem Possible reason - horizontal pump Possible reason - vertical pump
No liquid ow 2-3-4-5-6-7-8-12-15-22-24-31 4-5-7-8-12-15-17-22-24-28-31
Insufcient liquid ow 1-3-6-8-10-11-13-14-15-16-18-19-20-25-28-29 8-10-13-14-15-16-18-19-20-25-28-29-30
Insufcient pressure 8-10-13-14-15-16-18-20-25-29-30 10-13-14-16-18-30-25-29-30
Rising liquid temperature 8-15-19-25 8-15-18-19
Noisy pump or excessive vibration 1-3-6-13-14-15-20-21-22-23-28-34 9-13-14-15-16-17-21-22-23-32
Motor is overheating 13-15-16-20-21-22-23-24-25-27-28-29-30 15-16-21-22-23-24-25-27
Motor overload activated 20-25-26-28-29-30 22-25-26-29-30
Cracking/deformation 9-34-49 9-34-49
Corrosion 27-50 27-50
Filter problem Possible reason
No or insufcient liquid ow 8-19-28-38-39-41-42-48
Leakage 39-40-49
Pressure gauge reading not correct 35-36-37-38
High dial indication on pressure gauge 8-42-48
Bad ltering result 33-42-43-45-47
Foam formation in the bath 11-31-46
System / Pipework Liquid
1 Suction pipe too long or diameter too small 28 Liquid has crystallised
2 Air pocket in suction pipe 29 Specic gravity of liquid too high
3 Leak in suction pipe 30 Viscosity of liquid too high
4 Suction pipe or strainer blocked 31 Air / gas in liquid
5 Suction height too high 32 Abrasive particles in liquid
6 Air supply close to suction inlet 33 Colloïdal liquid
7 Foot valve or suction pipe insufciently submerged 34 Liquid temperature too high
8 Valve in pipework (partly) closed
9 Discharge pipe under tension
10 Leak in discharge pipe Filter
11 Return pipe not submerged (air intake) 35 Not enough anti-freeze in chamber below pressure gauge
12 Liquid level in tank too low 36 Membrane in chamber below pressure gauge deformed/damaged
37 Pressure gauge defect
Pump 38 Filter chamber insufciently bled
13 Impeller damaged or worn out by abrasives 39 Filter chamber not closed properly
14 Impeller out of balance 40 Filter chamber gasket damaged of deformed
15 Impeller / volute blocked by foreign matter 41 Filter element incorrectly installed
16 Wrong impeller choice (50 or 60 Hz) 42 Filter system element saturated
17 Volute not immerged sufciently in the liquid 43 Bypass of unltrated liquid
18 Wrong choice of pump size 44 Filter medium is too coarse
19 Pump is running at very low ow 45 Filter material damaged or torn
46 Unwashed cartridges used (residues of wetting agents)
47 Wrong choice of lter medium
Motor 48 Wrong choice of micron rating
20 Wrong direction of rotation
21 Cooling fan blocked or loose
22 Motor bearings jammed or worn out Material / Environment
23 Motor bearings incorrectly installed 49 Wrong choice of pump / o-ring material
24 Motor down on a phase 50 Aggressive environment
25 Incorrect voltage
26 Thermal overload setting incorrect
27 Insufcient cleaning
© Hendor - Quality Pumps & Filters - 9 - Info 28640/R0