Originally Posted by Zspray
Just FYI, at 40 psi you are bypassing very little. To get the full 4gpm for agitation, open the throttle valve which will decrease your pressure. Take your pressure down to as low as it will go with the boom valves closed. This will give you full agitation for mixing product.
Had the machine for 5 years and just now noticed it while trying to solve the issue. Thanks for the help.