I’ve owned my D3 for 14 years and last Saturday I decided to tighten the tracks in addition to my annual change the oil, fluids and once over check… The manual has a one line sentence with a picture showing 1.5 to 2″ deflection between the front sprocket and mid mount idler. I may have gone too tight using the grease gun adjustment to tighten the track on one side. I get different deflection …
https://www.tractorbynet.com/forums/threads/adjusting-track-tension-on-cat-d3-dozer.190303/