850C TCode-439 speed sensor

[roadbuilder]

Got an 850c with right track speed slower than left. TC 439. Could this simply be a corroded push connector? I would expect it to be on the right 1/2 of tranny towards final. Can it be reached thru door or does cab have to be jacked? Am I looking for a 2 wire connector?

[digitup2]

!.Digitup.

[digitup2]

It could be pumps need synchronizing.or sensor but also it could be something like a dual drive problem? .Anything whining or leaking in the drive components? .Did it just start this? has it came in gradually? How many hours are On this crawler ?I know too many questions !.Digitup.

[digitup2]

If it is that sensor it should show on a plug in diagnoses as well. I haven't had much problem with mine but could it be that the sensor is getting a bad reading .Where do you get TC439 from my monitor only shows #s no letters ?Is that a code reading ? there are two different series of C series crawlers both have slightly different monitoring systems .start with a pressure gauge on the hydraulic and drive monitor bank first .I have only lifted the cab to clean my C by luck ! .Digitup.

[roadbuilder]

Hi digitup!
Honestly, trying to find out for a fella on another site. I couldn't reach my mechanic and thought you were probably my best bet to help him out today. It had a 439 code which he said was a right side speed sensor. This had happened to me with one of ours a couple of years ago, but I called the mechanic, got on the excavator and shovel logged. When I got back it was fixed. If I remember correctly, it was just a corroded connector. Where would the right speed sensor be located and is it just a 2-wire plug connector? Accessible through the side doors? or would the cab have to be raised. He expects if he can't trace it to this, he will have to call the dealer.
Never too many questions, just not enough details from my end. I think he said it had been doing it for a while. I appreciate your help.
Dale