I am getting ready to do a little service to our craftsman chain drive GDO, lube/adj tension on the chain,etc. IIRC they give you a spec. of like ~1 inch sag below the C/L of the trolley or track. My question is; is this with the door open, or the door closed, because it is different in either case. Also, is it a good Idea to put a little White grease or some type of dry lube on the track and the trolley?(Not the roller tracks) TIA Tony D.
- posted
20 years ago