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Need Advice on freeing a shaft

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Dave K.

11-07-2001 18:32:32




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I have a trencher (DW 422)The hub of the driving wheel is welded to a pipe that fits over the drive shaft (about 1.25 in dia.)for about 8 inches. It is pinned at the end with a .5 bolt. The hub shaft pipe is "frozen" to the drive shaft. Much WD-40, hammering, cursing and rotational force applied with a 28" pipe wrench and cheater bar. Nothing.

Any ideas on how to free this up will be appreciated. I have trenching to do before winter.

Thanks in advance for any feedback- Dave

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spottedowl

02-15-2004 16:57:25




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 Re: Need Advice on freeing a shaft in reply to Dave K., 11-07-2001 18:32:32  
Soak with standard brake fluid. Generally never fails. This time it will make me a liar. good luck



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T_Bone

11-08-2001 03:59:13




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 Re: Need Advice on freeing a shaft in reply to Dave K., 11-07-2001 18:32:32  
Hi Dave,

I would use a torch to heat the pipe and that should expand the pipe to where it will loosen on the shaft.

I would also consider installing a grease zerk in the center of the pipe to stop this in the future.

T_Bone



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jeffpapier

11-07-2001 19:09:03




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 Re: Need Advice on freeing a shaft in reply to Dave K., 11-07-2001 18:32:32  
have a buddy hold the biggest sledge hammer you have against the back of the splice, while you hammer on the other side. do this along the lenght of the joint. this will expand the pipe without destroying it



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Mark Kw

11-08-2001 08:01:33




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 Re: Re: Need Advice on freeing a shaft in reply to jeffpapier, 11-07-2001 19:09:03  
Heat may damage the shaft if it is a heat treated alloy and care should be taken in the use of heat. However, if you control the induced heat and keep it to no more than about 400F (use a heat stick available at any good welding supply) this should give you some expansion of the pipe without taking any heat treatment out of the shaft. If the heat itself does not do it, apply liberal amounts of a good heavy body penetrating oil such as Lubriplate chain and cable fluid. This is the best product I have found right out of a can for doing this sort of work. Kroil is another good choice bud the body of this oil lighter and it tends to not work as well as the Lubriplate for deep penetration such as this. You can also help yourself by drilling a couple small holes in the pipe, center and near the closed end and applying the penetrating oil into these holes. After a good soak with the oil, two hours or more, a small amount of heat will help pull the oil around the shaft. If you use a torch, the oil will likely burn off before doing any work and can also cause a fire problem. Use a heat gun or hair drier to warm the pipe as you keep adding oil to it. The more oil you get in, the better it'll be. After oil and heat, use a small hammer like an 8 or 10 oz to tap the shaft with short sharp blows. You don't want to beat the snot out of it, just give enough hit to help break up rust and other corrosion that will allow the oil to penetrate futher. Repeated warming and oiling will also help. Good luck!

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