my bad, I didn't recognize that it was the motor that was acting strange heck without my coffee, I thought it was an electric forklift.
, and no, as far as I know there is no "centripical" or centrifugal clutch on these. BUT there is an "inching control" in the transmission, as well as "solenoid actuated modulation" valves that electrically control pressures in the transmission for direction (holding pressure to the clutch-packs). I think you may find the cable that operates when you depress on the left most brake pedal (and doesn't move when you press the right pedal) may be sticking or out of adjustment, or other parts of the same control (the spool might be sticking as it returns into the transmission valve body)

Also there is a "priority" valve that keeps the proper amount of hydraulic pressure on the steering system. does steering do anything to the symptoms you mentioned?