Hi New here with a question regarding my Dresser Td7G. I discovered the right side bushings were shot worn through on the track side of the bushing on one side, but the left are OK. I took it to my local Komatsu/Dresser dealer to have the Bushings turned on that right track. The track guy said I can't do anything with this, it is too far gone. Why the right would be that way and the left is Ok who knows, I am not the original owner. It has Berco chain on it now. The question is, if I have to replace the right chain,is that Ok and leave the left? Or am I faced with replacing both? The dozer is my occasional use farm machine. When it is used,it can be on steep hills here in Tennessee and gets a workout. It has served me well and is a strong running machine for what I need. The other question of course is if I replace one chain, is it Ok for aftermarket rather than Berco chain? Also, what about the sprocket, do I really need to replace that? Pictures attached of the sprocket, idler and rock guard w/bolts. None of actual chain because it is a local repair shop right now. Notice how rock guard bolt bushings are worn, that is similar to bushings on chain to be replaced. Photos are current, the date on camera was set wrong. Thanks for the response in advance. RH