Track tension bolts

General help and support for your Lindeman through 2010 John Deere crawler
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420C-Mike
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Track tension bolts

Post by 420C-Mike » Sun Jun 10, 2018 4:49 pm

I am rebuilding my track system. The tension bolts (1"x25') have some bad threads. Any suggestions? should I buy new bolts and remount the springs? Fastenal has some grade 8 long bolts or are the other sources?

Mike

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Lavoy
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Re: Track tension bolts

Post by Lavoy » Sun Jun 10, 2018 7:27 pm

You can chase the threads and try it. Correct bolts are not available.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

420C-Mike
40C crawler
40C crawler
Posts: 16
Joined: Mon Apr 27, 2015 5:59 pm
Location: Milwaukee

Re: Track tension bolts

Post by 420C-Mike » Mon Jun 11, 2018 6:55 am

Thanks Lavoy
I assumed the correct bolts are no longer available. Unfortunately, some threads have been completely worn off on one side for over an inch in length and bent bolts make turning the nuts extremely difficult even where threads exist. Fortunately I have 6 spring assemblies from which to make usable units. All is removed from the undercarriage so I have good access to make something work. I am also refurbishing the front idlers and replacing the standard units with oversize prior to repinning the tracks. Missing one oil seal, two others are split but usable with grease. Still deciding what to do for the third (compress the springs in place and fill with grease or bite the bullet and buy a new seal)

Progress continues albeit slowly!!
Mike

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Lavoy
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Re: Track tension bolts

Post by Lavoy » Mon Jun 11, 2018 8:09 am

I have new seals in stock.
One thing I have had to do in the past is have a machine shop thread 1" shaft the same lengths as the original bolt. Thread one end only a deep as a nut, weld it on, and sand the end off, and it looks so close to original that you can't tell. Only thing I don't like is the originals were zinc plated, so should send them out for plating would be best.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

420C-Mike
40C crawler
40C crawler
Posts: 16
Joined: Mon Apr 27, 2015 5:59 pm
Location: Milwaukee

Re: Track tension bolts

Post by 420C-Mike » Tue Jun 12, 2018 2:40 pm

Has anyone used a threaded 1" rod to replace the spring tension bolts? I can get 3 foot threaded rod with a yield strength of 105,000 psi (slightly better than grade 5)

Lavoy- I will give you a call regarding the seals and update on repinning the tracks

Mike

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