3100 was ag..could be had with 4 sp, 6sp, or 8 sp or sos trans. Ag tractors had the adjustable width front ends
3200 would be a rowcrop except no row crops were made in the 3000 family.... you have to move up to 4000, 5000, and 7000 to see rowcrop models.ie 4200, 5200, and 7200 submodels.
3400 was the utility version that had a heavier front end that was a fixed ibeam type that carried more weight than the ag tractor... other than the front end, the rest of the tractor was based on options... as to tranny, 3 pt, and pto configuration. But the front end was set in stone. Was popular for front end loader tractors.
3500 was the industrial model with a 10k lb front end axle, that had king pins and a heavy nose cone over the radiator. This tractor was the one used for backhoe frontend loader tractors. BUT the front axle and nose were what made it the 3500. Tranny models (including a torque converter and shuttle reverser), pto, 3pt, back hoe, front end loader were all options on the 3500...
a 3400 will share most parts with a 3000 of the same transmission configuration. but the front end and steering parts were a bit different as mentioned.
bouncing tach ... can be cable bad/dry, or the tach end needs lube, or there is/are dry parts in the actual mechanism. the nylon gear in the tach drive on the end of the generator can also be missing teeth or slipping at the cable slot. All these parts are available and reasonable.
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