My neighbor has a 1997 John Deere 310 se. One day it lost all hydraulics and forward and reverse. The dealer said the torque converter failed. The service call was going to cost more than the machine is worth so we pulled the transmission back. It was fairly easy. There was a small amount of metal in the splines of the converter but not a lot. He took the converter to the dealer to have them check it out and the said a bearing collapsed inside and sold him a re manufactured one. We put it back together and it work for about 30 seconds and quit again. Turns out that some time before he bought it, the transmission was removed for some reason and when it was reinstalled the did not line up the pump shaft on the splines of the torque converter and pushed it into the transmission pump. The pump shaft was only engaged by about 1/8" in the torque converter splines. He has owned the backhoe for about four years with no problem until now. It striped the very end of the splines on both the shaft and converter. Any way we got that fixed and the hydraulics work fine. However the machine will barley move forward or in reverse. The transmission fluid was foamy so we put new o rings in the transmission pump. The fluid is not foamy any more, but it made no difference with moving the machine. Is there a chance that the re manufactured torque converter is defective or did we miss something. We only pulled the transmission straight back and put the converter is and went strait back in. Where it failed there was no room to take the transmission out from under the machine. We never touched the valve body or solenoids. Thanks,
Did you have to remove the transmission to replace the pump shaft?
Did you check the transmission pressure? What is the pressure? Since the transmission pump and the drive shaft were disturbed, the T158795 stop on the transmission pump shaft could have moved forward and you will not be able to move the machine (because it blocks the oil flow to the torque converter when it moves forward). Remove the transmission pump and the drive shaft and inspect the stop (item #1 in the attached link). Take photos of it and attach. https://partscatalog.deere.com/jdrc/sidebyside/equipment/73186/referrer/search/pgId/561215 It can be replaced without removing the transmission.
The machine doesn't drive or has any hydraulic functions. The machine stopped driving and lost all hydraulic functions. Owner of the machine had the pump removed and rebuilt, the same thing no drive ,no hydraulic functions. Then he called me when he heard it will cost a fortune to get the transmission rebuilt. I think the problem is the torque converter or the pump drive shaft. I will get to the machine next week and pull it apart to check it out. Thank you for your help.
If I understand the operation correctly, The driveshaft for the transmission charge pump as well as the main hydraulic pump is driven directly from the engine. You said "machine doesn't drive or have any hydraulic functions". This points to a possible problem with driveshaft turning these pumps. If shaft is properly installed, the main hydraulic pump (which is attached to the transmission charge pump) should still be making pressure for operating other hydraulic systems such as backhoe, loader, etc. My first guess would be that you still have a driveshaft engagement problem or even a broken driveshaft. MG, please feel free to correct me on any of this if I have it wrong!
In post number 3 when I answered the OP I was under the impression they got hydraulics to work and the transmission did not drive. The second poster originally asked if the shaft could be replaced without removing the transmission. His later post indicated no hydraulics as well and you are correct JL, that would be a broken/stripped shaft.