[rotorwrench]

Most adjustments on Gemmer types move the sector gear to mesh with the worm. The early 2-tooth has odd bearings that are not available any more. If this is the case, the worm and a few other parts would have to be changed to be compatible with the later tapered roller bearings.

The old Gemmer 1 steering gear has three adjustments. One is end play of the steering shaft. The others are adjustment of the sector gear to close up the mesh between it & the worm plus an adjustment to center the sector with the worm. The centering adjustment is due to the movable nature of the sector gearshaft housing in the main body of the gearbox. The pitman arm has to have the same amount of play on both sides of center in the arc of movement or it isn't properly centered. After it is properly centered then the gear mesh adjustment has to be checked and adjusted for the least amount of play but still have smooth rotational force for both directions of turning. With good parts and careful adjustments, there should be very little play during steering movement.

A freshly overhauled steering gearbox should be able to use SAE 140 gear oil. I'm not a fan of the 600 steam cylinder oil since it could be some unknown mix of different lubricants like STP & SAE 90. The original viscosity of the 600 is very close to SAE 140 gear lube and the gear lube would have better corrosion inhibitors in it. Grease just pushes out of the way and stays there with no lubricating affect. John Deere corn head grease (thixotropic) would be better than plain old grease but both would be hard to get out of there if a person wanted to change out the lubricant.