My pet peeve...7400 electric steering. Worst engineering blunder of the forklift world. Your lucky it actually does steer! Depending on what software is in the truck, the steering reacts totally different in older versions. First, you must weld the ring on the drive unit. If the steer encoder sees the steer motor turning too long after the stop, it codes out. Newer software counts the degrees a drive unit turns after the "flag" or sensor activates. It then stops all steering before the drive unit hits the hard stops, and causes steer motor damage. Test I90 shows the degrees at each end. They should be equal, about 7 to 8 deg each end.
Start by welding the ring, then see where youre at. If its a big customer, and they can afford it, have a raymond tech install the latest software. Be sure to check the radial ring wear. No more thane 120 thou up and down play. Look under the truck, at the drive unit. Are there wear marks over the drive tire area? thats metal on metal drag, will cause codes and or NO STEERING!