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Yes it is normal for one wheel to turn near 90 degrees at the full turn left or right. But the straight ahead toe out or toe in is not normal and with wear this toe will change if you
are going forward or reverse. I have seen the steering to go from toe out forward to toe in when reversing. It will wear the tires quickly when the straight ahead toe is not right as you are sliding the tires instead freely rolling. You can see this scuffing of the tires on solid surfaces like a paved driveway.
This NZTR steering is very sensitive to wear and just replacing parts will not always fix the problem either. Plus I have the tie rods ball joints to fail a lot. Nearly every mower that has NZTR steering needs the use of a hydraulic press to bend the new linkages or at least it did on the 10 mowers that I had to straighten out the steering. Some mowers needed the complete steering system replaced and still need bending of some components. Just depends on how long it been out of alignment. It takes someone with the experience to straighten these out; not a job for the DIYer. And not every run of the mill repair shop can do it either. I have spent nearly a day on a few getting them straighten out as you have to fully assembly the steering system to check the alignment; if not right take it back apart, make adjustments, and try again.
Matter of fact I got a most of the steering components sitting on the shelf in the shop and I still may have to order some of the parts. And I cringe every time one these comes into the shop with front end alignment problems.
And top this off these NZTR mowers actually been seen sitting the sales lots new with the front end out alignment from the factory.