How To Do a Boom Air Purge

When switching between chemicals the Boom Air Purge on the John Deere Sprayer is a great feature that allows you to ensure the boom is cleaned of all product.

[@juassie]

Should I be concerned that it is reading 0 psi, should I pause it to build up pressure?

[@cooperjones4245]

My machine does not build up pressure either. That explains why I cannot make the feature work.