Re: Can't build air, not the D2 governor
Reply #2 –
I'm thinking along the same direction as Old Toolmaker.
There's really only 3 components involved in the air pressure "generation" process: the engine air compressor, the D2, and the air dryer. Since your malfunction is intermittent (randomly comes and goes) it is obviously not a blocked or blown out air hose. You changed out the D2 so we may assume it is OK. You are only too familiar with air dryer failure symptoms, and have ruled that out. Only thing left is the air compressor.
I thought you installed the ARB 12V air compressor so you could pressure up the air system with it? Use it to make the drive to storage lot?