Small dozer undercarriage

Hey folks.

I am completing a refurbish on my Ford 4500 tlb (motor rebuild, repair hydraulics) and am working on rebuilding the hoe bucket.

I have been interested in a small dozer, perhaps JD 350-450 size and I think I can handle most engine, geartrain and hydraulic issues but I have no experience with tracked equipment and am pretty ignorant on this issue to the point of being reluctant to consider buying one without knowing how to assess the undercarriage.

I was wondering it anyone had...

Small dozer undercarriage

Small dozer undercarriage