General Pump MK Owner Manual - Manual (Page 15)

GENERAL PUMP
A member of the Interpump Group
MK SERIES
13. PRECAUTIONS AGAINST FREEZING
In areas and periods of the year where there is
risk of freezing, follow the instructions indicated
in Chapter 12 (see paragraph 12.2).
In the presence of ice, in no case must the
pump be started until the entire circuit has
been completely thawed out; not complying
with this indication may cause serious
damage to the pump.
14. WARRANTY TERMS
The pump is guaranteed for a period of 12 months from
the delivery date or for 1000 hours of operation, with the
exception of parts subject to wear. In any case, please
refer to the contract terms for other warranty conditions.
The warranty is void if:
a) The pump has been used for purposes that differ
from that agreed.
b) The pump has been fit with an electric or diesel
engine with performance greater than that indicated
in the table.
c) The required safety devices were un-adjusted or dis
connected.
d) The pump was used with accessories or spare parts
not supplied by General Pump.
e) Damage was caused by:
1) improper use
2) the non-observance of maintenance instructions
3) use not compliant with operating instructions
4) insufficient flow rate
5) faulty installation
6) incorrect positioning or sizing of the hoses
7) non-authorized design changes
8) cavitation
15. TROUBLESHOOTING
The pump does not produce any noise at
start-up:
• The pump is not primed and is running dry
• There is no water in the inlet line
• The valves are blocked
• The delivery line is closed and does not allow
the air in the pump to be discharged
The pump pulses irregularly (knocking):
• Air suction
• Insufficient feeding
• Bends, elbows, fittings along the suction line
obstruct the fluid’s passage
• The inlet filter is dirty or too small
• The booster pump, where provided, supplies
insufficient pressure or flow rate
• The pump is not primed due to insufficient
head or the delivery line is closed during
priming
• 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
Page 15
Ref 300669 Rev.B
05-13