JLG 600s. Has all functions except drive. When you put it in high torque it will start to roll and then stop itself, almost like the brakes engage. Will not drive in rabbit or turtle. It is 4wd 2ws. Customer bought at auction with current issue. Has new control handle, pump, pilot pressure valve solenoids. All drive motors checked and not bypassing. Seems like an electrical issue to me. Any thoughts? Also, where is the level sensor on these? Cannot find typical level sensor attached to frame. Internal in control module maybe?
What year is it? I have 1a 1996 that does that i am trying to replace diodes at this time to see if that will fix the issue. Mine will travel while holding the left steer. But mine does not have left steer only right. If you have a new control stick. It may need to be calibrated. Depending on year it may need a tool.