Unless your MD injection pump was switched sometime, it has a type A IH pump with a primary and scavenger pump on the rear with 3 lines plumbed to it. 400 may have a type A or B, If its a B type there will be 2 lines plumbed to primary pump and no scavenger side. A drip tube is used on the bottom of B type pump and none on A. If you switch from one type pump to the other some of the lines will need replumbed. Model number of pumps is on a metal tag on side of pumps. Some adjustment may be needed when switching certain pumps to a different engine and some will be okay.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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