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A crankshaft splines

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DC

05-19-2003 15:56:15




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I have a 52 A that the drive disc became loose and wore the splines in the crankshaft. I was wondering if there was a way to repair them without replacing the crank. Thanks in advance. DC




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Clooney

05-19-2003 17:36:37




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 Re: A crankshaft splines in reply to DC, 05-19-2003 15:56:15  
DC, if you are a good welder & have lots of time you can weld up the splines & grind them close , then hand file them back to close to factory specs. It's an awful lot of work [trust me].
~OR, you could give Dengler Tractor Inc. a call [1-513-423-0706], Dengler has a verity of under sized clutch driver disks just for worn crank splines.....



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Would this work Clooney??? - from Scruffy

05-20-2003 11:42:51




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 Re: Re: A crankshaft splines in reply to Clooney , 05-19-2003 17:36:37  
Clooney, have you heard of anyone having the gear resplined to match the crank instead of resplining the crank to match the gear???

I'm in the same boat as DC so I talked to my local machinest who has experience respining JD cranks and asked him if he could respline the clutch drive disk to match the crank spines. He said he'd never thought of doing it that way to fix a loose clutch drive disk but that it should work.

He said I could just drive the tractor to the machine shop, pull the clutch pads and loose clutch drive disk to expose the crankshaft splines. He said he should be able to have the gear splined to match the crank by that afternoon for me to reassemble and drive home.

I've never heard of anyone doing this so I didn't know if there was a problem with this approach. Seems simplier/cheaper/quicker than removing the crankshaft.

Did I have a good idea???

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Clooney

05-20-2003 14:34:26




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 Re: Re: Re: A crankshaft splines in reply to Would this work Clooney??? - from Scruffy, 05-20-2003 11:42:51  
Scruffy, I'm not sure how he is going to re-spline that drive disk to match a worn crank. There are some inherent reasons why I don't think it will work.
~The first is, the crank & drive disk are tapered [does he know that?]. Tapered splines are very difficult to cut.
~Second, the drive disk is already worn bigger than the crank so just cutting new splines won't do the trick. Either the disk will have to be welded inside & then the tapered splines cut, or the crank will have to be built up & re-splined. The splines in the drive disk are also worn wider so there is no way to make them narrower without welding them up & re-machining them. There isn't enough meat left to cut new splines between the old ones.
~If your machinist does manage to weld that disk up without warping it, then figures out a way to cut two way tapered splines in the welded disk, & gets it to pull to the proper location [very important for proper clutch operation] & can do all this for less money than a new undersized disk from Denglers please let me know as he works awfully cheap.....

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Thanks Clooney!!! - Scruffy

05-21-2003 07:45:53




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 Re: Re: Re: Re: A crankshaft splines in reply to Clooney , 05-20-2003 14:34:26  
Unfortunately I didn't know about undersized disks until yesterday after reading your post. I had already ordered a new disk that was delivered this morning. So I'll take some measurements from both the shaft and new disk to see how far the crank has worn. If the new disk isn't tight I'll give Dengler a call with my measurement and price yet another disk.... Day late and a dollar short....

I'll also take one of the disks to the machine shop and have him look at it and see what he thinks. I thought it sounded too good to be true, which is why I asked. I know he planned on building up the inside of the disk and cutting new splines. He knew the crank was tapered from resplining them in the past so I assume he knows the gear is tapered, but we'll cover that when I have him look at a gear. I'm not a machinist but I think he would have to fill it in completely, drill the center whole, cut straight splines, and then taper the splines.

But after reading your post I don't know if I want him working on my new gear, but I don't think the old gear is any good. It looks like it was heated up too much at some point being removed because it is really soft.

I also looked up Dengler on the internet and found their page on expresspages.com. I hopped on mapquest.com with their address to see if they are located near some friends of the family and it couldn't find the address in the city listed, not even the street name. Then I went to questdex.com and it couldn't find any phone listing for Dengler.

You ever have those days when nothing is going right????? But I'll give them a call from the number listed on their web page to see where they are located in Ohio.

Maybe my luck will improve by this weekend and the new gear will fit tight. I'm not holding my breath....

Thanks for all of the help and insite. It's great having knowledgible people to bounce ideas off of and keep me out of trouble.

thanks,
scruf

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