Correcting crab steer

[dakota-2000]

What is the best way to get all 4 wheels going straight after having a 5600c crabbing. I've read the manual but still having trouble.

 

[Gadgetnut]

While moving slowly in 4 wheel steer mode I turn the steering wheel until the rear "wheels straight" light comes on. Then I turn off 4 wheel steering mode and turn the steering wheel again until the front "wheels straight" light comes on. At this point both wheels straight lights should illuminate simultaneously and then I turn the 4 wheel steer back on. You do this and you're still having trouble?