I just bought a project 99 md70. I cant seem to get the hydraulics that run the loader to work. The drive motors work fine (they spin but no tracks yet to see how good). The aux hydraulics pressure up and when on PTO the pump spins. I noticed from the pictures the aux/pto and main hydraulics are from same pump but maybe different impeller. I dont get any flow when I disconnect the line right where it exits the fluid tank. What else should I look at before I go and pull the pump out of the tank? Also what do the small hydraulic lines do on the undercarriage that tie in downstream of the drive motors before the chaincase? One was broken off but nothing was coming out of it. Thanks