I've worked on a couple 1840's. They have a parking brake that consists of a rod that fits through a ring of holes in one of the sprockets to lock it. They are mechanically released when you pull the handles into the operate position. I'd take a look at all that linkage. I'd guess something there was frozen and messing around with it and the heat from it running it loosened it up.
As mentioned, the plastic covers for the chain cases are horrible for letting water in. The last one I worked on, I tossed the rubber gaskets and used rtv to seal them up. I also had to make a metal strap to go across the top of them as they all had the mounting ears cracked or broken off.
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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