You didnt put back the steer sensor exactly where it was. The truck thinks the steering is turned all the way in one direction. On a tight turn, ANY 3 wheel counterbalance truck will have one wheel in reverse and other full forward.
Without any laptop or scanner, you can get it close. Raise front wheels off ground and put stands or blocks under truck. Center your steer wheel as straight as you can. Engage forward and have throttle giving full fwd. Seperate the steer senser from hub, then Adjust the steer senser by turning it until both whhels are going fwd, at max rpm.