Hydrovac with safe state

Abstract

A hydrovac is provided having, an engine, a transmission comprising a power take-off connected to a hydraulic pump, a debris tank, a vacuum hose connected to the debris tank, a boom carrying the vacuum hose, a blower operative to create a vacuum in the debris tank, a hydraulic motor connected to the blower to drive the blower, the hydraulic motor connected to the at least one hydraulic pump, an emergency shutoff valve connected in fluid communication with the debris tank, a boom isolation assembly which in a closed position fluidly isolates the debris tank from the vacuum hose, and a controller. A controller operative to, in response to the controller losing communication with a remote control, open the emergency shutoff valve, close the boom isolation assembly, disengage the power take-off, and after the power take-off is disengaged, slowing a speed of the engine to an idle speed.