General Pump KFZ Owner Manual - Manual (Page 21)

GENERAL PUMP
A member of the Interpump Group
KFZ SERIES
15. TROUBLESHOOTING (cont)
The pump does not deliver the rated flow / is noisy:
• Insufficient feeding (see the causes listed above)
• RPM are less than the rated value
• Excessive amount of water by-passed by the pressure adjustment valve
• Worn valves
• Leakage from the pressure packings
• Cavitation due to:
1) Wrong sizing of the suction hose/ undersized diameters
2) Insufficient flow rate
3) High water temperature
Insufficient pump pressure:
• The nozzle (or has become)too large
• Insufficient RPM
• Leakage from the pressure packings
• Incorrect operation of the pressure adjustment valve
• Worn valves
Overheated pump:
• The pump is overloaded (pressure or RPM exceed the rated values)
• Oil level is too low, or the oil is not of a suitable type, indicated in Chapter 7 (see paragraph 7.4)
• Incorrect alignment of the joint or pulleys
• Excessive inclination of the pump during operation
Pump vibrations or knocking:
• Air suction
• Incorrect operation of the pressure adjustment valve
• Valve malfunction
• Irregular drive transmission motion
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