I just installed a new yoke on the drive shaft on my MD70. The loader works perfectly but the tracks will not move. I thought maybe there's a valve closed or something not allowing fluid to pass through. I think this problem is what caused the yoke to break in the first place. Any suggestions on whether it could be the transmission or the hydraulic pump that feeds off the tranny? I'm stuck here. I like the machine, but repairs and finding parts is a hassle to say the least. Thank you.