You can remove the pitman arm from the gear box (it's sometimes very difficult ) or you can remove the drag link from the pitman arm. If thats to much work, just jack the front tires up and go about the adjustment. Its not the ideal way but will get you pretty close. When setting the center preload adjustment, add a little to the scale to compensate for the rest of the steering joints still hooked up.
If you have decent looking grease in the box, add some liquid gear oil to thin it out some and/or top off the box. Don't fill it to the top or you will push lube up the steering column. Just get enough to cover the gear teeth.
While the front is off the ground, check the tie-rod ends, king pins, and drag link ends. Its also a good time to grease them.
If you really want to change grease or add some, look for a grade 0, 00, or 000, with 000 being the thinest . Grease is measured on a scale, 0 and down will self level or run easily. 1,2,3,and up, get thicker and denser the higher the number. Corn head grease is a 0 grade. You want grease/oil that flows back to its original location and level, standard grease gets pushed out of the way and just sets there, never returning to the gear mesh area.
Joe
