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Allis Chalmers Discussion Forum
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WD torque tube

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wdTom

02-27-2004 18:04:14




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Does anyone know what the hole in the front top of the torque tube is for? It is near the machined surface that runs forward from the clutch cover and is just off to one side of this machined surface and just back from the front of the torque tube. There is a small freeze plug in it. It showes in the parts book and the plug is there too, but what was the purpose of the hole??
May thread mine, while it is apart, might make a good return for some hydraulic application in the future as it dumps into the hydraulic reservoir.

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acd17toy

02-28-2004 05:14:46




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 Re: WD torque tube in reply to wdTom, 02-27-2004 18:04:14  
tom, that is used as a vent on the later models some 45's had a fractory vent tube on them for the hydrulic system.



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wdTom

02-29-2004 18:23:11




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 Re: Re: WD torque tube in reply to acd17toy, 02-28-2004 05:14:46  
Thanks for this information. This torque tube is from a 51 tractor with a serial no of 77470. I am putting it in my 49 because it has the double seal feature between the transmission and hydraulic system. I threaded the hole 3/8" npt today and installed a pipe plug there. I thought the hydraulic system was vented through the belt pully area and into the bellhousing. Maybe they decided they need a better vent but it is puzzling why they were putting this hole in such early tractors if it wasn't used until later 45. I am not doubting what you say, just thinking out loud here. Thanks for getting back to me.

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Ty

02-29-2004 19:05:26




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 Re: Re: Re: WD torque tube in reply to wdTom, 02-29-2004 18:23:11  
I'm going out on a limb here but the hole probally orignally had to do with casting the torque tube. I know from doing some work in a foundry that makes heads that freeze plugs are not to prevent craking from freezing but have to be put in there to get all the sand mold out of the casting.



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wdTom

03-02-2004 17:17:57




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 Re: Re: Re: Re: WD torque tube in reply to Ty, 02-29-2004 19:05:26  
You are right, but this one is too little for that, and there is openings in the casting for the core, big openings, like for the hydraulic pump and bearing in the front of the torque tube. It could have been a locating poing for machining though, which is maybe what the machined surface forward of the clutch cover is. All other machined surfaces and holes could have been located in relation to this point. Just guessing.

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