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Bob's Blog
Minneapolis Moline Jet Star 4

Problem: When starting the tractor, the steering immediately steers right on it's own can't be controlled no matter how hard you turn the steering wheel.  The steering control valve had to be removed off the steering gear assembly. Once removed, it was dismantled and what was found is the spool assembly was sticking in the housing. After installing a seal kit and running a really fine hone in the bore of the steering  spool housing, the valve spool moved freely back and forth and centering itself as it should. Reinstalled the unit and it works fine.

(click on photos to enlarge)
Location of steering valve Once removed, the pin controls the spool valve Spool valve removed
  Use hoses on pressure and return valve into 5 gal pail when turning the valve with the engine shut off or you will get an oil mess.  
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