Bobcat 753 shutters going forward, swapped lines on the pump

[frdf250]

Have a Bobcat 753 with around 3000 hours. Both drive motors were just rebuilt about 25 hours ago by a hydraulic shop in the area. After running it for a bit the other day I noticed that the right side shutters/struggles and is sloppy going forward - reverse is fine. Today I swapped the right side lines off the pump trying to isolate the issue. Now forward is great and reverse is the issue. Can someone help me pinpoint what to look at/replace?

 

[frdf250]

After reading more online it could be the relief/check valve? Has anyone had this happen before and after replacing the ones on the top and bottom after pulling the motor/pump unit had success? Is it the same PN for both left and right?


<img src="http://i813.photobucket.com/albums/zz59/philipberardi/pumpdiagram.jpg" alt="text" width="86%'>

 

[BCATMECH25]

After reading more online it could be the relief/check valve? Has anyone had this happen before and after replacing the ones on the top and bottom after pulling the motor/pump unit had success? Is it the same PN for both left and right?


<img src="http://i813.photobucket.com/albums/zz59/philipberardi/pumpdiagram.jpg" alt="text" width="86%'>

Bobcat calls them replenishing valves. They control the drive pressure coming out of the hydrostatic pump. They are all four interchangable and the same psi/bar rated so you change swap them. Depending on your serial # if you put a gauge where the drive motor hoses hook up to the pressure can get around 5000 psi.