During this procedure the pump is upside down. The stand 605 70 00 is used to support the
pump in the upside down position. For instructions for attaching the stand, see
on page 67.
The propeller parts are shown in the following figure.
2
3
1
5
4
6
WS003614A
1. Propeller screw
2. Washer
3. Propeller
4. Adjustment screw
5. Conical sleeve
6. Conical shaft end
6.8.1 Measure the clearance
Depending on the type of media that is being pumped the pump will be more or less
exposed to wear, mainly in the gap between the propeller blades and the pump housing.
The clearance between the propeller blades and the pump housing will increase. The effect
of this is that the capacity as well as the efficiency will drop. It should be noted that these
effects are not linearly proportional to the size of the clearance, but progressive.
Operating the pump when the blade–housing clearance has reached or exceeded the
clearance threshold will result in a loss of capacity (flow) and pump efficiency.
It is therefore recommended that the blade–housing clearance be checked at routine
inspections and worn parts be replaced as necessary. If the measured blade–housing
clearance exceeds the critical limit, then we recommend that the efficiency drop be
evaluated and replacement of worn parts be considered.
1. Measure the clearance between the propeller blades and the pump housing in a few
places to get an average value.
The blade–housing clearance can vary slightly as the propeller might not be perfectly
centered due to manufacturing tolerances.
6 Maintenance
70
P7030, P7035, P7040 Installation, Operation, and Maintenance Manual
