Potential source for Squealing noise from our AirStar Compressor and Mojave Vacuum Systems

AirStar Membrane Housing:

1. Remove five screws holding cover for the relief valve in place.
2. Reset spring and ensure that the two discs are not damaged and can lay flat.
3. Reinstall the five screws.

Mojave:

1. Tighten all of the screws on flange located on top of tank by manifold.
2. Tighten all of the screws at flange going into pump.

This will seal the gaskets better and remove the air leaks causing the squeals!