A few things to consider - heat the slide bracket and frame of the idler both sides, if the machine is outside and in a freezing conditions. Check for and aft movement of the idler with a block of wood and pry bar.
If the idler moves it maybe time to remove the hydraulic track tensioner and service it.
Also, use the pry bar to see if there is any lateral deflection in the idler on its cross shaft. Have seen 650 series machine lock up, (jam) a track due to an excessively worn cross shaft. Check the measurement from the edge of the idler to the inside of the rail on both sides and see if they are close to the same. If not, then add idler cross shaft service to the list along with service of the hydraulic track tensioner.
Lets us know of your progess....
~ Orangeman
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