The steel surfaces of the inner brake drum, both sides of the actuator, and the bull pinion carrier, are worn from 60 years of use and abuse.
What's happening is the actuator is going past its limit, making the bang you hear.
The fix is to take the brake drum to a machine shop and have them mill the edge down. I don't know the spec off the top of my head, but with the two brake disks and the actuator stacked in the drum, lay a straightedge across the edge of the drum and measure down so many thousandths.
O.E.M. Tractor Parts used to offer this service IIRC. They would send you a replacement drum, actuator, and new disks milled to spec, and you would mail back your old drum and actuator as a core for minimal downtime, or you could send yours in.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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