Track Jerking

[Builder151]

I have a 2017 Bobcat T770 track loader. Lately I'm having an issue where the right side track will not operate smoothly. When going forward, reverse, and turning the right side track is jerking. The left side runs perfectly smooth. Its not very noticable at start up but once the machine has been running for awile and the hydraulic fluid is warm the problem gets much worse. I have replaced the forward and reverse control solenoids and that did not fix the problem. I removed the hydraulic fluid filter and found that there are tiny copper color metal fragments in the fluid. So I suspect something in the right side final drive motor has failed and I need to replace the final drive. But I want to get some other opinions before I go spend $3,500 on a new final drive. From that I can see the hydraulic lines come off the hydraulic pump and go straight to the final drive motors. I don't see individual pumps that could run the final drives but as you know the space inside these machines is very tight so I could be wrong. Am I missing something??? Is there something else I should check? Thank you in advance to any advise!

 

[BamaBrian]

I have a 2017 Bobcat T770 track loader. Lately I'm having an issue where the right side track will not operate smoothly. When going forward, reverse, and turning the right side track is jerking. The left side runs perfectly smooth. Its not very noticable at start up but once the machine has been running for awile and the hydraulic fluid is warm the problem gets much worse. I have replaced the forward and reverse control solenoids and that did not fix the problem. I removed the hydraulic fluid filter and found that there are tiny copper color metal fragments in the fluid. So I suspect something in the right side final drive motor has failed and I need to replace the final drive. But I want to get some other opinions before I go spend $3,500 on a new final drive. From that I can see the hydraulic lines come off the hydraulic pump and go straight to the final drive motors. I don't see individual pumps that could run the final drives but as you know the space inside these machines is very tight so I could be wrong. Am I missing something??? Is there something else I should check? Thank you in advance to any advise!

I don't see any replies here. Have you gotten any info by other means?

I'm a nuubie, so I can't tell you anything other than this… I have a 2015 T770, and bought the service manual. There are technically two hydrostatic pumps, but they are built into a single unit. The diesel engine drives the hydrostatic pump unit by the main rear drive belt. Then the hydraulic pumps are driven by a shaft coming out of the end of the hydrostatic pump.