My D6C 69J which I have recently resurrected has identical sprockets, rails, and undercarriage, and the tracks are adjusted the same. I had to drive it down our straight county road to get to where I have now dug a new pool. I constantly had to correct it as it tracked to the right badly. Being a clutch and brake machine, how does this happen and what do I need to look for to fix it?
Check for swing frame toe out, measure from the hardnose to idler on both sides for starters and see if the measurements are close
The final drives have used gears in 1 side out of maybe a 955l loader just a thought good luck BIG D