It certainly looks like it was modified with the additional compressor. Original tractor probably had AirPack air over hydraulic, then someone added another compressor and lines for full air brakes on trailers.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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