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We need to discuss basics of how your system operates. The compressor is pumping 100% of the time, but when it builds pressure is determined by the D2 governor located on the passenger side firewall under the hood There’s only a few things that can STOP you from building air, 1) most common...

No, no cage bolts for front they do not have piggyback springs Sent from my iPhone using Tapatalk

For reference from your posts, it appears you have M923A2. Did you disconnect the signal line on compressor? Sent from my iPhone using Tapatalk

Also, is your drier blowing air out the bottom of the purge valve constantly? IE large leak Sent from my iPhone using Tapatalk

M939 or M809 series truck I assume? Your Governor or unloader may be stuck, carefully remove the little air line on the compressor head. That’s your signal line, and with the truck running place your thumb over the compressor port, and also one over the line you disconnected. Does it blow from...