General Pump KEZ Owner Manual v.2 - Manual (Page 14)

GENERAL PUMP
A member of the Interpump Group
KEZ SERIES
Page 14
The pump pulses irregularly (knocking):(cont)
• The pump is not primed due to valve seizing
• Worn valves
• Worn pressure packings
• Incorrect operation of the pressure adjust
ment valve
• Transmission problems
The pump does not deliver the rated flow / is
noisy:
• Insufficient feeding (see the causes listed
above)
• RPM are less than the rated flow
• 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 adjust-
ment 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 suit-
able type, indicated in Chapter 11 (see para-
graph 11.1.1)
• Excessive belt tension or incorrect alignment
of the joint or the pulleys
• Excessive inclination of the pump during
operation
Hose vibrations or knocking:
• Air suction
• Incorrect operation of the pressure adjust
ment valve
• Valve malfunction
• Irregular drive transmission motion
15. TROUBLESHOOTING (continued)
Ref 300665 Rev.C
07-13