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OK, let's identify it .... (1) Is the seat centered, or is it off-set to the left side? If off-set see #2, if centered see #5. ----- ----- ----- -- (2) Does it have hand brakes? If so you have a WC. If not try #3. (3) Does it have a hand clutch? If so you have a WD or WD45. Go to #4. (4) Does it have a straight gearshift? If so you have a WD. If not you either have a WD45 or a very late WD. That's as far as I can get you on that set of tractors. ----- ----- ----- -- (5) Does it have a bench-type seat? If so you have a C. If it has a spring-loaded seat go to #6. (6) Is the temperature gauge on the radiator poking through the top of the hood? If so you probably have a CA. If it's in a dash below the steering wheel you probably have a D series tractor - go to #7. ----- ----- ----- ----- - (7) Does it have a straight gearshift close in front of the seat? If so it's probably a D17. If it has a gearshift that curves out from under the seat it may be a D10, D12, D14 or D15. Go to #8. (8) Is there a hand clutch allowing 2 speed ranges and an iron channel or frame support that runs along the side of the engine? If so you have a D14 or D15 (D17 also has this). If not you have a D10 or D12. Whew! That's enough for a start. I'll bet you have a WC, WD, or WD45 from your description. Maybe one day I'll make a good key up for these to help ID them. Check the Allis Chalmers Images at the link provided - it may help you find yours. I just don't think the model U, A and other early ACs had a single front wheel option.
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