The rail measured 4 and 1/4' tall at the back end wondering what they measure when new? The bushing the rail pins go through where worn pretty badly but had not been turned does anyone turn these anymore or just replace the rails? The idler's themselves seemed to have some life left in them, but the mounting assembly had a lot of play. One roller was off with bolts broke off up inside the frame, a second worn so bad that it was into the bearing hub, and both rear idler rollers (upper) were egg shaped down to the bearing hub on one side and 1/2 inch on the other. Did not hear any clunking sound but must have been able to see at least 1/2 to 3/4 movement and it was not spring, you could clearly see the hub moving. Is the most likely cause a leaking oil cooler? The second thing was way more than 1/8 movement in the sprocket teeth when pryed out with a bar. The owner seemed as surprised as myself when we discovered it. The first thing was a skim of oil on top of the antifreeze in the radiator.

thanks every body for the help.A follow up on the D6C that I took a long road trip to inspect. i reduced the filter head from 1' to 3/8'. i used a filter for a fuel tank with a sediment bowl on it and a 10 micro filter and i ran it all weekend no problems.

Oh and anther thing is i think my fuel supply pump is going out because there is diesel coming out of the weep hole i just found this after i put my new inline fuel filter and hose on. Any ideas of what my problem maybe i am hoping i just need to change the filters but have not had a chance to do it yet when i first start using it it raises really fast but once it warms up the hydraulics start running really slow that if i don't give it some throttle it will not move barely. i have made sure that i have the right amount of hydraulic fluid. So to start off i am having trouble with my hydraulics they still work but end up being very slow raising up. i have tried using the search but i have not yet figured out how to uses this forums search button what i have is a D6C 10k shes a little ruff but i have a few question about her due to this is the largest dozer i have owned. Hello i figured i would start my own thread due to i did not want to hi jack the other thread.

Cat d6c specs weight