First get yourself a good set of manuals!! That will cover all of this. You really need them to set up the hydraulics and do your own servicing. I just finished repairing the shimmy on my NFWD. I had worn pins in the steering shaft universal joint and slop in the worm gear mating with the quadrent gear. Up under the front of the tractor, where the steering shaft enters the steering box you remove the plate that the steering shaft goes through. You will find a series of shims between this plate and the casting. Remove shims so the worm slides in a little to be tighter on the sector gear. If there is any slop in the u-joint, replace it and the pins that hold it to the shaft. The pins and parts are available from AGCO. I buy almost all of mine by mail from Sandy Lake Implement telep 724 376 2489 They will also give you help on the repairs over the phone, answer questions etc. Good folks to deal with, very fast to ship. This repair fixed all my shimmy and was easier than pulling the pedestal bearings etc.