The tie-rod runs from the right wheel over to the left wheel so that the power steering cylinder attached to the right wheel will power both wheels. The left tie rod end has a zerk, the right tie rod end has a zerk, and the power steering cylinder has a zerk on my 2000 model TC45D. Unless NH quit installing zerks on later tractors, yours should have the same three zerks. The tie rod is not bent, it is straight: no curves, no rubs, no errors. If yours is bowed it is evidence that the tractor has been driven into (probably backed into) something and bent your tie-rod; especially if it is rubbing.