To try to explain how it works a bit... The purge valve is sent a pressure signal from the governor when the compressor cuts out. If you think about a shop air compressor, the air release when the compressor unloads as it stops is the same thing that opens the purge valve on your truck. The purge valve could be sticking, it could be the governor, or, not likely, but it could be an internal leak in the compressor. Pay attention to when the purge valve closes, if its when the compressor starts pumping again, I would change the governor and go from there. Governors are cheap anyways.
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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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