140 High Crop Gearing

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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140 High Crop Gearing

Postby Clownfish » Mon Dec 15, 2014 3:59 pm

Is the gearing different on the 140 HC Than the normal 140 to compensate for the larger wheels? The ground speed seems very fast for the HC.

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Re: 140 High Crop Gearing

Postby havoc1482 » Mon Dec 15, 2014 4:26 pm

No there isn't. IH used the same transmissions for both 140 and 140HC. It was more cost-effective to have 1 part for 2 tractors than 2 parts for 2 tractors.

The HC has higher groundspeeds simply because of the larger diameter wheels. If you put it into perspective, it doesn't really matter. The difference in ground speeds for cultivation is negligible, especially if you consider throttle adjustments.

I have heard that some 140s have a high-ratio 4th gear from the factory. The 140 we have at work zips really fast in 4th, its crazy going down the road on it
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Re: 140 High Crop Gearing

Postby Denny Clayton » Tue Dec 16, 2014 10:32 am

Being used to my Cubs all these years, my 140 loader tractor seems soooo fast. There are so many times that 1st gear is too fast for some things I want to do.
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Re: 140 High Crop Gearing

Postby Clownfish » Wed Dec 17, 2014 7:18 am

Should you be able to start off from a dead stop in 4th gear on the High Crop or do you need to get it rolling in a lower gear and then shift to 4th? This one will not start moving in 4th but once you get it moving it's too fast. I'm afraid to go over 1/2 throttle.

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Re: 140 High Crop Gearing

Postby John *.?-!.* cub owner » Wed Dec 17, 2014 9:11 am

I will admit to not being very familiar with a 140 high crop, but mist any old tractor should be able to start off in road gear on level ground. You cannot just release the clutch, you will need to feather it a little, but no more than if you were making a gentle start in a lower gear. One of the most commonly overlooked items on these old tractors is the distributor timing. I suggest as the first step, using a timing light to check it. If it is slow there will be a definite decrease in power. Next thing to check would be valve adjustments, compression tests, etc.
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Re: 140 High Crop Gearing

Postby Matt Kirsch » Tue Dec 23, 2014 2:22 pm

It's about a 30% difference in speed from the 24" to the 36" tires.

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Re: 140 High Crop Gearing

Postby rexxon » Fri Dec 26, 2014 10:41 am

I have a 140HC with the high speed 4th gear and I can tell you it's way too fast, I had a friend get behind me in his truck to clock me-- it was somewhere close to 20 mph---- it was not fun and did not feel safe.
'When I do use high gear on the blacktop road I use half throttle.


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