Have you had the dozer for an extended time and was the problem with the tracks showing when you first got it ? It could have a bent dead shaft or broken one .
Idlers look really thin!
If the track keeps wanting to walk off, I'd check more than just the alignment. Make sure the roller frame pivots and bushings aren't worn out, check the recoil spring and track adjuster are working properly, and inspect the sprocket, rollers, and idlers for uneven wear. On those old D4Ds, worn guide components can make it look like an alignment issue when the real problem is play in the undercarriage. Also verify both roller frames are sitting square and the track tension is set correctly.
