General Pump KFM Owner Manual - Manual (Page 9)

GENERAL PUMP
A member of the Interpump Group
KFM SERIES
Page 9
9.4 Hydraulic Connections
In order to isolate the system from the vibrations produced
by the pump, we advise to build the first section of the duct
near the pump (both for intake and delivery) with flexible
hose. The consistency of the intake section must allow to
avoid deformation caused by the depressurization
produced by the pump.
9.5 Pump Feeding
In order to ensure the correct volumetric efficiency
a minimum positive head of 0.20 meters is
required. Negative suction heads are not allowed.
9.6 Suction Line
For the pump’s correct operation, the suction line must
have the following characteristics:
1. Minimum internal diameter as indicated in the diagram
in paragraph 9.8, and in any case equal or greater than
the pump head’s value.
Along the duct, avoid localized diameter reductions
that may cause pressure drops with subsequent
cavitation. Absolutely avoid 90 0 elbows, connect-
ions with other hoses, bottlenecks, counter-slopes,
upside down “U” shaped curves, “T” connections.
2. The selected lay-out must allow to avoid cavitation.
3. It should be perfectly airtight, and built in a way that
guarantees perfect sealing over time.
4. Avoid pump emptying when stopping (even partial
emptying).
5. Do not use hydraulic-type fittings, 3 or 4 way fittings,
adapters, etc. , since they may hinder the pump’s
performance.
6. Do not install Venturi tubes or injectors for detergent
intake.
7. Avoid the use of standing valves, check valves, or any
other type of one-way valves.
8. Do not connect the by-pass line from the valve directly
to the pump suction line.
9. Provide appropriate baffle plates inside the tank in
order to avoid bentonite flows coming from both the
bypass and feeding lines may create turbulance near
the tank’s outlet port.
10. Make sure that the suction line is perfectly clean inside
before connecting it to the pump.
The version may be changed only by special-
ized and authorized personnel by carefully
following the instructions in the repair manual.
9.3 Version Change and Reducer Positioning
A right version pump is defined when: observing the
pump from the head side, the PTO shank of the pump
shaft is on the right side.
A left version pump is defined when: observing the pump
from the head side, the PTO shank is on the left side.
See fig. 5 (which shows a right version).
1. Separate the hydraulic part from the mechanical part
as indicated in Chapter 2, paragraph 2.2.1 of the
repair manual.
2. Rotate the mechanical part by 1800, and reposition
the rear crankcase cover to that the oil dipstick is fac
ing upwards; reposition the lifting eyebolt ant the
related closing caps in the upper part of the
crankcase; finally, correctly reposition the identifica-
tion plate in its appropriate seat on the crankcase.
Be sure that the lower draining holes on the
crankcase near the plungers are open, and
not closed by the appropriate caps as
required for the previous version.
3. Join the hydraulic part with the mechanical part as
indicated in Chapter 2, paragraph 2.2.5 of the repair
manual.