350 tracks on a 420

General help and support for your Lindeman through 2010 John Deere crawler
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danny
40C crawler
40C crawler
Posts: 13
Joined: Thu Nov 27, 2014 11:04 am
Location: Central Maine

350 tracks on a 420

Post by danny » Fri Dec 05, 2014 4:11 pm

The tracks/links on my 420 are pretty much gone. I have read here that 350 tracks will adapt if I use 350 sprockets and mate the center of the 420 sprocket to a 350 sprocket to get the correct bolt pattern and offset.
Will the 420 idlers and rollers work with the 350 track and is there any other known issues I would run into? Are there any other mods needed to adapt 350 tracks? I plan on keeping this crawler and using it in my woodlot for a long time so as well as rebuilding my final drives I will spend for a good set of tracks.

Thanks everyone for your input. I am a good mechanic but there is no replacing the experience that is available on this forum.

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Stan Disbrow
350 crawler
350 crawler
Posts: 2894
Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Post by Stan Disbrow » Fri Dec 05, 2014 7:20 pm

Hi,

The difference is 350 rails have fatter pins and bushings. The rest is the same. But, you do need the 350 rim sprocket teeth to match the fatter bushings.

If you get just chains, then you will find you need new pads. 4 bolt vs 2 bolt.

Stan
There's No Such Thing As A Cheap Crawler!

Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

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