There are two locations for a serial number, one on the back of the rear end housing and another on the left side of the diesel engine (as viewed from sitting in the seat) at the front of the block kind of beneath the water pump. Your number 2H3548 indicates it's a 1937 model, unclear if it's a RD6 or D6, as the change was somewhere between 2H2863 and 2H5144. Standard track gauge is 56", wide gauge is 74", as measured centerline to centerline of each track. You can check the steering clutch adjustment through the top cover bolted right in front of the seat. Through there you'll be able to see the steering clutch release yokes and mechanisms and maybe see what's going on in there.
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