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Noise is going to depend on a few things:

Presence of dust inside cap and around rollers
Set speed of pump motor


When you run the pump at slower speeds, more noise will be produced...

Hi Jeff,

1. The screws themselves will not "wear out". The only parts that will wear overtime (depending on usage) are the blue cap, rollers, and tube. The tubes should last you quite a while. A...

Have you removed these blue caps to inspect and/or clean?

Hello,

You mention pumps, but do not specify exactly which pumps you are referring to; KHD mixing pump or Doser pumps.
Without this information, diagnosis is difficult.

Please create a support...