This unit is equipped with both an automatic unloader and automatic idle/throttle control.
Automatic Unloader Valve: When the air tank reaches the maximum operating pressure of 175 PSI, the unloader valve automatically opens/blows off, venting air to the atmosphere to prevent over-pressurization. (It also features a manual unloader lever for easy engine starting/manual depressurization, plus two safety relief valves - one on the pump and one on the tank).
Automatic Idle Control (Throttle Control): When maximum pressure (175 PSI) is reached and the unloader vents, it automatically activates the engine throttle control to hold the engine at a preset idling speed to save fuel. Once air pressure drops to 135 PSI, the control automatically accelerates the engine back to full throttle to resume pumping air.





