1. Propeller
2.
Pump housing
3. Critical clearance
Figure 36: Critical clearance
Pump Clearance threshold for efficiency drop, mm (in)
7030 1.3 (0.051)
7035 1.2 (0.047)
7040 1.6 (0.063)
If the measured clearance is less than the threshold value given in the table above, then
the rest of the steps in this section can be omitted. If the measured clearance is greater
than the threshold value in the table above, then proceed as follows:
2. Measure the wear in the pump housing with a thickness gauge by placing the edge of a
ruler across the surface of the housing.
1. Ruler
2.
Wear
3. Replace parts according to the table.
Pump Wear measured, mm (in) Action
7030 0.3 (0.012) Replace the propeller
1.0 (0.039) Replace the bellmouth
6 Maintenance
P7030, P7035, P7040 Installation, Operation, and Maintenance Manual 71
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