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Discussion Starter #1
I just bought a 1940 B and it will not stay in low range and the range shifter hits the clutch lever. Stays in high range. Any ideas on where I should begin?

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I'd get a parts and service manual, probably an operators manual too. Dad bought a '40 B back about 1969. I tried using it to do chores, rake hay, other light tasks it was capable of on our 200 acre crop, hog, & cattle farm. I finally gave up and it was used to haul 3-4 loads of manure every year. Just too limited in what the B could do, too slow, plus no radio because no battery/generator/lights/starter. The FARMALL Super H was much more powerful, faster, rode better, steered easier, and had lights, starter, & RADIO, and live hydraulics. The Super H replaced '39 H that had all those options too.

Anyhow, could be worn part/parts in the shift linkage, or worn bearing on a shaft in the high/low gear train, slime possibility the gears are worn that much. Or an accumulation of all these things. The gear shift shifts back to low when you shift into reverse. Wear in that linkage is common and likely your problem from what I've seen on other forums.
 

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Took the steering pedestal off. Here's what I found. Quit a bit of play in the gears. Really no broken teeth except the high/low gear looks to be worn. None were broke off.

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Does the shifter shaft have any side to side play? I believe there is an adjustment under the left side cover. Don't get crazy with it, just snug it down.

It was good you opened that trans up. It needs a good flush to get all that water out.

The gear with the clashed teeth is indicative of a bad/missing or excessively worn clutch brake. The clutch must be stopped in order to shift the gears. If there is a lot of rotation during a shift, you slam really hard brittle steel into each other. That's a great way to knock teeth off of those gears.
 

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Ok a little more info. There is very little wear in the teeth. The sliding gear does not engage fully when the slide hits the detent. You have to shove about 1/4" past the detent to engage. I don't see any way to adjust this. The only thing I can think is that the shaft below has to come toward it. I don't see any way of doing that either. Here is the side that would have to go in 1/4

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Does the shifter shaft have any side to side play? I believe there is an adjustment under the left side cover. Don't get crazy with it, just snug it down.

It was good you opened that trans up. It needs a good flush to get all that water out.

The gear with the clashed teeth is indicative of a bad/missing or excessively worn clutch brake. The clutch must be stopped in order to shift the gears. If there is a lot of rotation during a shift, you slam really hard brittle steel into each other. That's a great way to knock teeth off of those gears.
Please check this shaft. The detents engage in slots in this shaft. If the shaft is able to slide side to side, then the gear will as well.
 
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