US Patent 10533301 GPS and laser grading control

A hydraulic control system for an earth-moving vehicle with an automatic grade control system that hydraulically powers the height of the blade through the hydraulic accessory port. When using a laser based system the main arms are controlled through the accessory port and a pitch movement of the blade is limited. When using a GPS based system the accessory hydraulic is disconnected from the main arm and reconnected to the pitch hydraulic to affect the height of the blade.