T300 sjc drive issue

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bryrob02

bryrob02

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Jun 25, 2026
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Hello everyone, Im new to this forum and I need some help/ advice on this 2005 t300. It had a hydrostatic pump failure an I disassembeled everything and cleaned and flushed the system. Replaced the hydraulic control valve with the lift and tilt spool valves, resealed both drive motors, rebuilt all of the cylinders, and when I got it back together it did work but one track was slower. So that was a couple years ago now and it sat. This spring I got it running again and it was working pretty good until the left track stopped moving in one direction. And it kept showing low charge pressure. I found that the right side charge output was capped and it was only using the left charge pump. So I fixed that and set the charge pressure to both pumps to 370 psi cold at idle. Reset the pump neutral and Control neutral settings and the right side now wont work. It will work when moving the little plastic lever on the pump controller but not with the joystick. So I thought it might be electrical. I switched the wheel spped sensors and controller plugs so the left was controlling the right side and right controlling the left and same thing. Only the left track works. I am out of ideas and have tried everything I can think of. Its like the pump or controller neutral keeps changing. Sometimes when I start it the right track will start moving on its own, sometimes forward and sometimes backward. So when it does I adjust the neutral adjustment to stop it from moving and try to recalibrate the controller and the right side either wont move or moves then wont stop. I have taken the controller off and checked the spool to see if it was stuck and it moves freely. Does anybody have any ideas? Or have had this issue? Thanks
 
That's a solid rebuild job on the hydraulics. One track running slower after that kind of overhaul usually points to a couple things. Did you happen to bleed air out of both drive motors thoroughly after reassembly, or is it possible one side still has a pocket trapped in there? Also worth checking if the rebuilt cylinders are both holding pressure equally under load. Got a photo of what you're working with?
 
Since the right track moves when you manually stroke the lever on the pump controller, I’d be looking more at the EDC/control side rather than the pump itself.
The fact that it sometimes moves on startup by itself makes me suspicious of the neutral centering/feedback mechanism. I’d check the EDC centering pin, springs, and feedback linkage for wear or anything keeping it from returning to center.
 

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