Grundfos NBS, Инструкция по эксплуатации

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21. Note condition of cover O-ring (surface cracks, stiffness and
swelling).
4.2 Checking gap between impeller and pump housing/
cover (wear rings)
1. Measure and note the diameter of impeller and pump housing
interfaces.
TM080380
Two measurements must be made (positions 12-6 and
3-9). The wear ring may be worn oval due to different
directions of radial forces.
TM080471
2. Measure and note the bore in cover (wear ring, if fitted).
TM080381
3. Measure and note impeller interface to pump housing.
• For maximum gap values, see the dedicated section for Gap
between impeller and pump housing/cover (wear rings).
TM080382
Related information
6.3 Gap between impeller and pump housing/cover (wear rings)
4.3 Removing the impeller
1. Remove impeller from shaft, always use soft jaws in the vice
TM080383
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