Give some guidance from an expert
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What do 1 2 3 4 here refer to?
There should be drawings. Look for the certificate of conformity.
Each critical part will have a dimensional tolerance. The tolerance of some parts is determined by several other related parts. For this pump, the radial runout tolerance of the impeller is: 123470% of the sum of the dimensional tolerances of several interrelated parts. I don’t know if I can understand. Of course, you must have basic knowledge of mechanics.