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Case Tractors Discussion Forum
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Case 311 or 312?

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bgrieves

08-26-2013 10:47:33




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Hi, I just got a 1956 Case 300 series tricycle. Down under the dash it has it's serial number and model stamped into it. The model reads 312? I thought it was a 311 could anyone tell me what the difference is? I thought the 312 was a highcrop but this has 28's on the back and 16's on the front. It seems to be original?




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BarryfromIA

08-26-2013 19:32:30




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 Re: Case 311 or 312? in reply to bgrieves, 08-26-2013 10:47:33  
A 312 has different axle housings than a 311 to accommodate the larger axle shaft. They were the forerunner to the 351 and the 500b, 600b series.



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Joe Young

08-27-2013 12:48:00




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 Re: Case 311 or 312? in reply to BarryfromIA, 08-26-2013 19:32:30  
Hey Barry

I wasn't aware that the 312 & 312B had different axles and axle housings, but the parts manuals clearly points out that is the case. I took a look at the axle housings or my 312 and my 351 and they too are different

Do you know if the diameter of the 312 axle is larger than the 311? I don't have access to a 311 to measure.

Thanks a million for pointing out these differences. I always learn something new here. - Joe

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BarryfromIA

08-27-2013 18:30:59




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 Re: Case 311 or 312? in reply to Joe Young, 08-27-2013 12:48:00  
I went out and eyeballed them with a tape measure and I get 2 1/8 for a 311b and 2 3/8ths for the 312. I do not have my micrometers here they are at work. I had a wheel off to replace an outer seal on the 312 is why I noticed the difference.
This post was edited by BarryfromIA at 18:34:29 08/27/13.



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Joe young

08-27-2013 19:13:28




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 Re: Case 311 or 312? in reply to BarryfromIA, 08-27-2013 18:30:59  
Thanks Barry.... That's good information. I wonder why case made that change on the 312. I checked the parts diagram for the 351, 500B/600B and the 630, and the axle housings and axles are all different than the 312 as well. That makes the 312/312B axle parts very scarce. Thanks again. - Joe



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BarryfromIA

08-27-2013 19:31:39




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 Re: Case 311 or 312? in reply to Joe young, 08-27-2013 19:13:28  
At the time you could get a kit to mount and use the CASE mounted corn picker. The drive mounted to the belly and was driven from the belt pulley.



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Joe Young

08-26-2013 11:58:08




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 Re: Case 311 or 312? in reply to bgrieves, 08-26-2013 10:47:33  
bgrieves

There are a number of possible explanations for the situation you describe with your 311/312, and I'd offer the following three:

- The model / serial number tag is not original to your tractor.

- The 36" rear wheels/tires/rims have been replaced with 28" versions.

- You have a "Johnny Cash Special" that was assembled "one piece at a time" by someone with more than one donor....

The 312 is actually identical to a 311 in all aspects except for those items necessary to accomidate the taller 36" wheels/tires/rims. A few of those items include:

- The eagle hitch assembly has a number of different parts.

- The fenders have a section added on the bottom to raise them approximately 4 inches.

- The front-end axle/steering assemblies (wide & narrow) are different to raise the front of the 312.

Pictures of the eagle hitch, and/or the front-end would tell the tale.
What is the serial number of the tractor?
This post was edited by Joe Young at 12:01:22 08/26/13.

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bgrieves

08-26-2013 15:41:41




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 Re: Case 311 or 312? in reply to Joe Young, 08-26-2013 11:58:08  
third party image

third party image

third party image

Joe the serial number is 6051125 should be a 56 I don"t show where they made 312"s in 56 maybe they just stamped the wrong model number on it.

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Joe Young

08-26-2013 19:58:42




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 Re: Case 311 or 312? in reply to bgrieves, 08-26-2013 15:41:41  
You definitely have a 311.....



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