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Restoration & Repair Tips Board

CORRECT DAMAGED THREADS ON LARGE SHAFT

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MIKE LOKAI

10-23-2004 18:17:43




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NEED HELP REDARDING DAMAGED THREATS ON THE END OF A COUNTER SHAFT OFF A JOHN DEERE 620.I CANNOT GET THE NUT STARTED. I TRIED BEVELING THE THREADED END AND FILE THE DAMAGED THREAD, NO LUCK. NEED SOUND ADVICE




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JRB (TN)

10-25-2004 19:32:06




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 Re: CORRECT DAMAGED THREADS ON LARGE SHAFT in reply to MIKE LOKAI, 10-23-2004 18:17:43  
Would be best if you could use a thread restorer die. I haven't tried the split nut deal but a true die is much harder than the base metal on you shaft and would cut the threads and would not seize to the base metal. Don't know how much the shaft costs, maybe a factor in the repair. In any instance I would use a good threading lubricant such as tap-magic etc. compatible for the base material being threaded. Just my two cents from similar problems.

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Joe (Wa)

10-23-2004 22:15:09




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 Re: CORRECT DAMAGED THREADS ON LARGE SHAFT in reply to MIKE LOKAI, 10-23-2004 18:17:43  
If the thread on the shaft is long enough, say 2x the width of the nut, take a new nut and file a groove 3 places across the threads to make it like a die. Saw through one side of the nut and pry it apart just enough so you can thread it all the way down pass the damaged threads on the shaft. Take a pair of vicegrips and clamp the nut to squeeze the slot you sawed together as tight as you can and still turn the nut on the shaft. Work the nut back and forth as you unthread it over the damaged threads. When you get near the end of the shaft it will be obvious if it is mushroomed too much to continue with the nut. Then you will have to file down to near the dia & height of the good threads and use a die. Cheap dies & thread chasers can often be cut and spread some to use the same as the nut above.

Sorry for the long post, pass my bedtime, brain cell is nodding off.

Joe

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txblu

10-25-2004 05:36:46




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 Re: CORRECT DAMAGED THREADS ON LARGE SHAFT in reply to Joe (Wa), 10-23-2004 22:15:09  
Joe,

That is an excellent Idea. Will file your thread for later reference. Amazing what the human mind can conceive to work out of a jam.

Mark



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msb

10-23-2004 20:27:25




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 Re: CORRECT DAMAGED THREADS ON LARGE SHAFT in reply to MIKE LOKAI, 10-23-2004 18:17:43  
Have you tried using a thread file?Mic or use a caliper on the shaft in several places to determine where the problem is before you file it down.



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Hermit

10-23-2004 19:18:38




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 Re: CORRECT DAMAGED THREADS ON LARGE SHAFT in reply to MIKE LOKAI, 10-23-2004 18:17:43  
If the threaded shaft end was hit with a hammer so the shaft could be removed, it might have mushroomed out. That would prevent the nut from going on even if the end is beveled.



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