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Farmall & IHC Tractors Discussion Forum
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A nd BN... what's the difference?

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Mike CA

07-15-2007 19:48:21




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I was flipping through my Originality guide today in the A / B section. B is a wider A... So what is the difference between a BN and A? They look the same in the pictures I saw.




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Nat 2

07-16-2007 06:39:14




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 Re: A nd BN... what's the difference? in reply to Mike CA, 07-15-2007 19:48:21  
The key differences between the A and B/BN are on the left side. They do indeed look practically identical from the right. The B has a narrow front end, and the rear wheels are the same distance from the transmission on both sides of the B. On an A, the left wheels are tucked right up against the transmission and engine; it's a true "offset" tractor. Only the operator platform is offset on the B.

IH called the A a "one row" tractor because it could only cultivate one row of corn, and the B/BN a "two row" tractor because it's wide enough to cultivate two rows of corn. Horsepower is the same on both.

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CNKS

07-15-2007 19:53:15




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 Re: A nd BN... what's the difference? in reply to Mike CA, 07-15-2007 19:48:21  
The BN has I believe 8" narrower tread width than the B. The B and BN have a single or narrow front, the A a wide front only (there have been owner conversions of all three tractors). The engine is in the center of the B and BN, the A engine is offset to the left. Nearly all parts are interchangeable. Identical drive trains.



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Athol Carr

07-15-2007 19:53:26




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 Re: A nd BN... what's the difference? in reply to Mike CA, 07-15-2007 19:48:21  
The BN is a narrow B, the axle housings on each side are the same as on the right-hand side of the A whereas in a B they are 4 inches longer, i.e. a BN is 8 inches narrow than a B. The front is the same as a B with a tricycle arrangement. A lot of the BNs used a single front wheel instead of the dual wheels. A wide front axle was not available. The C corrected this. The problem with A and B was the difficulty in adjusting wheel track widths, resolved when the C appeared with long axles where the wheels could be slid out to whatever tread was required.

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CNKS

07-15-2007 20:02:30




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 Re: A nd BN... what's the difference? in reply to Athol Carr, 07-15-2007 19:53:26  
Correct except that the single vs narrow front for both tractors depended on row width. Single front on both was used for vegetable cultivation in narrow rows, about 20 inches. The disadvantage of the B compared to the BN is that you had to go wider instead of narrower for some row widths. My dad's 2 B's were set at 96 inches more often than not. We used spacers to get the rears wider than the factory 92 inches. The C did solve that problem. Also depends on what part of the country you are in. Tradition, right or wrong, influenced most decisions in those days.

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