Number of track links on a D2

My D2 4U with 4 bottom rollers has 30 links.
regards
Mike

Microlink,

The information I have is, The later D2’s which were inducted in early 1954 had several changes to the track components. The track assemblies were longer, and two links having been added to make a 32 link chain. They had four (4) rollers but were spaced farther apart than formerly. And, carrier rollers were installed, where they were formerly offered as an attachment.

The early D2’s models of the 3J and 5J tracks were all 30 sections. The only other D2‘s which more than 30 track section were the D2 Tractor--for Highway Trailer Company Earthbore models which had a 35 Section track and the D2 tractor for Trackson Company T2 traxavator which was a 35 section track as well.
Kelly

If your D2 has the larger 23-1/2" idlers it should have 31 links, same for all the J models and U models up to 5U13235 and 4U6372.

If your D2 has the larger 23-1/2" idlers it should have 31 links, same for all the J models and U models up to 5U13235 and 4U6372.

Josh, thanks for heading me in the right direction. Now if I was only sure how to measure the idler. The D2 with 30 links has an idler casting number of 1B309 and the tractor in question has an idler casting number of 8F4360. If I measure the minor diameter of the 8F4360 truck it is 22" and the truck step is 3/4" making the major outside diameter 23 1/2", so is this the larger idler requiring 31 links? These are both spoked idlers, not the solid idler.

My parts book verifies the 8F4360 idler is the optional 23 1/2" diameter one, requiring 31 track links. I would say you've measured correctly.

Thanks Toby, I have three different D2 parts books, none of them show the optional 23 1/2" idler. This is the first good news in quite a while on this U/C project. Just happens the tracks that I have to put on are 31 links. So now I just snap them on, right?

Just snap 'em on. .riiiiiight😆 I've made a couple of slave pins for various sized critters. .about a 32nd of an inch smaller than the regular master pins. I use those to pin tracks together, then drive the master pins in while driving the slave pins out at the same time. Sure made life a lot easier doing it that way.

Well the tracks are snapped back on. And after being on rabbit blocks for nearly a year she can once again move under her own power. But, as before the nose is a bit low. This 25U has the straight equalizer spring and it looks straight with the machine weight on it. What I find is the wear plate on the track frame is very thin. The spring leaf also is thinned to about half the new dimension. I’d like to build up the wear sheet, what type of material would work for the wear sheet that will not wear away the spring steel? I have considered aluminum, bronze and soft steel any ideas here? What ever I use it will need to be able to conform to the equalizer spring wear.