I am by no means an expert on this and someone more qualified and with a helpful attitude will come along soon, but I have had success by checking brushes which need to be replaced periodically. You need to do a little disassembly. start by taking a punch and making a pair of little pricks on the edge of the back plate and then on the side of the housing right next to them to guide in reassembly. Do the same at the front end. then loosen the four long screws that hold it all together then back two of them out one at a time. when you see how far they come out to release you see at what point you need to be careful about supporting it in order to keep it from falling apart. Carefully finish removing the screws and slide the back plate away and you will see the brushes that are held by springs against the commutator which is a part of the shaft. The brushes will be held by wire to the housing. some are held by screws and some by solder. my local hardware carries an assortment as do auto parts stores and dealers. Reassembly can be a little tricky in the part of holding the brushes back while sliding back together. I have overcome this simply by retracting the brushes with some light string then pulling it out when done. hope this helps.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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