Well TXDOT is going to charge owner of truck $100,000 for repairs. I have drove dump trucks before.The old ones have two levers and the new ones have two air switch's.The PTO switch has a lock out button and warning buzzer are light.One lever are switch is for up,hold and down.One commenter said if the PTO button was engaged that the hydraulics would bypass valve at high speed.I call BS on that.