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Heat-Pressure-Beating-to no avail

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Jack

04-12-2000 17:28:00




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That 1386R pulley gear is a LU LU on my 70.I layed the pulley clutchside down on the work bench and proceeded to heat and put a rather large puller on it,and beat the puller on the tip and the gear never moved.I am very hesitant to get just super aggressive because if it breaks there is about 150.00 down the drain.I realize that it is no good like it is but,this is not nickels and dimes I'm talking.I want some of your opinions on this matter(clean ones please).Thanks,Jack(TN).

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Gman

04-14-2000 08:07:20




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 Re: Heat-Pressure-Beating-to no avail in reply to Jack, 04-12-2000 17:28:00  
Jack on my 70 lp std, I had to remove that gear from the pulley to replace a clutch dog. I took it to Cornetts Machine shop in Somersrt Ky,they took it off but it maxed out a 60 ton press getting it off. Some good advice while you got the gear off replace the clutch toggles and clutch dogs C74-r and save your self some greive inthe future. Replacing these parts will give you a nice crip clutch.Good Luck Gman

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Jack

04-14-2000 10:20:22




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 Re: Re: Heat-Pressure-Beating-to no avail in reply to Gman, 04-14-2000 08:07:20  
Yeah,I'm going to replace all I can while I'm in there,because I only want to do this once.



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clooney

04-13-2000 13:29:47




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 Re: Heat-Pressure-Beating-to no avail in reply to Jack, 04-12-2000 17:28:00  
Jack, does that pulley really have to come off of there? If the drive pin & the hole in the sleeve are "OK" & the sleeve holes for the toggles are not too worn you might not have to pull the gear. If you have to pull that drive gear do as dave said & use a (3) jaw puller, preferably a 15-20 ton hydraulic unit. Make sure that the radius of the puller jaws dosn't rest on the outer edges of the gear teeth ( I use pieces of brass to space the puller jaws out slightly off the teeth) also make sure that the jaws are are long enough to get a solid hold on the solid metal part of the gear. Also make sure that the center piece that the puller point pushes against is just slightly smaller than the ID of the gear, if it is too small it will try to expand the pulley spool that the gear goes over & make it even harder to pull the gear. If you have to use heat ( I never have had to) keep the heat away from the teeth. Don't pull the gear on the bench, put the whole assembly on the floor on a piece of plywood, so if that gear comes loose and gets away from you it will not chip the teeth when it hits the floor. Let us know if, how & when you get it off, it will make good reading.

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Dave Wickman

04-13-2000 07:39:18




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 Re: Heat-Pressure-Beating-to no avail in reply to Jack, 04-12-2000 17:28:00  
Jack, As Don has said below, I also have removed many of these over the years and yet have had to heat one. The way we always pulled them was to use a 20 ton three armed hydraulic puller. I realize this is something that the average person is not going to have access to but you may want to take it to someone that has one. The other thing I did was push them back on in a press and that also may be something that you will have to source out. Who ever does push it back on make sure that they block the center of the hub so they are not pushing all the pressure on the rim of the pulley because you can break the center hub out of pulley. They are on there pretty tight, the worst one I ever had was on an 820 diesel, the air over hydraulic pump running the hydraulic puller stalled where it would not even pump any more, I could see the arched arms of the puller weren't arched anymore I didn't know what to do standing there looking at it when all of a sudden the gear decided to let go, The whole pulley and puller assembly jumped 2 feet clean up off the cement floor. Like John T. said scared the living s#!% out of me. After I got my heart started again I seen that the gear was almost all the way off the pulley!! So be careful when working around these things. The puller that I used at the John Deere dealers was the same hydraulic puller that we used to pull the snapping roles from the corn heads gear cases. Not saying that you cannot use heat but would leave that as a last resort if I was planning on using the gear over. I never like using heat on the hardened gears, but sometimes one has to do what he has to. Good Luck, Dave Wickman

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John T

04-12-2000 19:30:21




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 Re: Heat-Pressure-Beating-to no avail in reply to Jack, 04-12-2000 17:28:00  
Jack, I helped Davey do this on an A and it was pretty scary. We placed a huge puller in perfect alignment then heated all around the gear (where it mates on its inside) with a torch slow and deliberate. We kept circling the inner hub of the gear with the torch till it was all red and very slowly (with a 3/8 impact wrench) kept tightening the puller we kept heating and slowly tightening the puller and suddenly she popped and scared the *^&^%%&*&*% out of me. Good luck. The constant heat and steady pull finally popped it out. Ol John T in Indiana.

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Leger

04-12-2000 20:20:56




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 Re: Re: Heat-Pressure-Beating-to no avail in reply to John T, 04-12-2000 19:30:21  

You would have better results with high heat on the gear- the idea is for the shaft to stay cool and the gear to be hot and expand off the shaft. Never use impact tools on a puller, it ruins them.



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Jack

04-13-2000 17:25:35




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 Re: Re: Re: Heat-Pressure-Beating-to no avail in reply to Leger, 04-12-2000 20:20:56  
Hey fellas,I realized I did not have a puller big enough so I called a friend of mine who works at the local JD dealer and he said bring it on down.I took the assembly to him and he and his mechanic put thier puller on the gear and commenced to heating and pulling with thier puller and ended up stripping the threads on thier puller.He said he thought it barely moved before the puller stripped.So it will be next week when the new puller arrives.We'll see then.I sure want to hear that ole 70 pop,soon.Thanks everybody,I will keep you all informed.

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clooney

04-13-2000 18:20:10




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 Re: Re: Re: Re: Heat-Pressure-Beating-to no avail in reply to Jack, 04-13-2000 17:25:35  
Jack, I just knew your experience would make good reading!



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Mike Aylward

04-12-2000 18:25:35




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 Re: Heat-Pressure-Beating-to no avail in reply to Jack, 04-12-2000 17:28:00  
Jack, this is just an idea, but can you take your torch and (gingerly) split your gear to relieve the tension on it? You probably can slice it not quite all the way through, then take a chisel and finish the job, then it should come right off. It will likely be easier trying to split it through the keyway so you don't damage anything else. You might need a new key, but at least you won't damage anything else. Hope this helps. Mike

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Mike Aylward......again

04-12-2000 18:30:37




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 Re: Re: Heat-Pressure-Beating-to no avail in reply to Mike Aylward, 04-12-2000 18:25:35  
Jack, I forgot to mention in my post that this procedure is used IF the gear is bad and you don't want to save it (obviously). Sorry to not be as clear as I should have been. Mike



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Don

04-12-2000 18:24:30




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 Re: Heat-Pressure-Beating-to no avail in reply to Jack, 04-12-2000 17:28:00  
I use a hydraulic puller rated at 17 ton and it will stall out at times .I then hit it with a 3lb hamer and the clutch pulley will jump clear off the floor . I've never hurt a gear yet . Been at this for near 40 years . Don



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