Portable air compressor, will not load

Hi, Is it an Atlas Copco XRVS 476 / 1000 portable air compressor? If I am not mistaken, this one has a Caterpillar C13 diesel engine, right? Anyway, for most of these big Atlas Copco machines, the regulating is about the same.. Compressor output is regulated in two ways: by engine speed and by the inlet valve. The inlet valve opens and closes the intake air supply to the compressor and regulates how much compressed air the compressor makes this way (together with the engine speed). See the intake valve page for more information. On this compressor, the engine speed is controlled electronically by the engine controller. The inlet valve is controlled (opened/closed) by compressed air. So, there is something wrong with the inlet valve itself,or there is something wrong with the pneumatic control system. This pneumatic control system is basically a regulating valve that increases pressure to the inlet valve when the compressors air pressure rises. This closes the valve. When the air pressure drops, the regulating valve also lowers the control air pressure. This opens the inlet valve. Also, there is a magnetic valve (solenoid valve) that is the ‘loading valve’. At start-up and directly after start-up, this valve is open and supplies air pressure directly to the inlet valve. It by-passes the regulating valve. This pressure keeps the inlet valve closed. The compressor is running ‘unloaded’. When you press the ‘load’ button, this solenoid valve should close, so that the inlet valve is now controlled by the regulating valve. (when you press ‘unload’, this valve opens again and the inlet valve closes). If this solenoid is not working anymore (could be a mechanical or electrical problem), the inlet valve stays closed and the compressor will not create any compressed air. I have included a few pictures of a similar machine. Yours might look a little different. I have copied part of the regulating system from the manual, with the regulating valve and solenoid valve.. The dark blue line coming from the top is the main pressure from the vessel. The light-blue line going to the right is the control air to the inlet valve. The thing at the front with the square connector on top is the magnetic solenoid valve. The pipe at the bottom (labeled ‘VH’) is the vent hole. It’s just there to vent a little air to remove water from the air. I have also included a picture of the same two valves. And a picture of a inlet valve. So in short: - The inlet valve is broken and is stuck in closed position. - There is no control pressure going to the inlet valve, which means the regulating valve is broken, or the solenoid valve is broken. Alright, this was quite a lot of information :) Anyway, if the compressor is still new and you are not able to fix it quickly. Give Atlas Copco a call. The compressor might still be in warranty period (they give 2 to 5 years warranty on their machines). Good luck. And if you have any more questions, just let me know..