Pump Shut-Down; Gear Pumps With And Without Self-Priming Unit; Service And Maintenance - Bauer Magnum SM 540 Operating Manual

The evacuation pump does not take anything in – the lever on the return valve can be moved easily
(a) leakage in the intake line
-
(b) intake line clogged
-
ð
re (a) Check intake line and seals
ð
re (b) Rinse separator/trap
When the evacuation pump is taken into operation, the return valve is closed because of the negative
pressure – the lever on the return valve can only be moved with great effort. In case of leakage or
clogging, no negative pressure can be built up.
Note: If the intake hose is only pushed through the surface scum of the manure cistern, or if the
content of the cistern is not properly mixed, solid components may be taken in that clog the
intake line.
The suction process takes very long and the centrifugal pump cannot deliver any more; the water column (liquid
manure) breaks down:
- (a) slight leakage in the intake line
- (b) suction height too high; medium too viscous
ð
re (a) Check intake line and seals
ð
re (b) Reduce suction height and/or add water
The evacuation pump is slightly more powerful than the centrifugal pump. If there are slight leakages or if
the suction head is too high, the evacuation pump may be able to fill the intake line, but the centrifugal
pump is no longer able to delivery the medium.
Note: If the liquid manure is very viscous, only half the suction height compared to water can be
achieved.

5 PUMP SHUT-DOWN

5.1 Gear pumps with and without self-priming unit

Close the stop valve in the delivery line and lower the speed until the engine stops. Then disengage the PTO.
Now open the stop valve slowly allowing the liquid still remaining in the pipes to flow back into the pit and release
overpressure.
If only a short interruption is planned we recommend to close the valve. This will save renewed filling of the
pump.
If the pump is moved to a different position the counter-pressure must be released as described above When
the pump is uncoupled sufficient liquid remains in the pump and it is not necessary to fill it up again for instance
with water before putting the pump into operation again.

6 SERVICE AND MAINTENANCE

It cannot be emphasised often enough how much proper service and maintenance influence performance
reliability and service life of a machine.
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Operating manual for BAUER gear pump