Rancho RS9000 Knobs Stuck - Called Rancho Tech
 

I called Rancho Tech on this issue, mine are 4 years old and are hard to turn plus you can't move them past setting 3. (5 setting shock)

The tech said to remove the two allen head screws and assembly, spray silicone in there and reassemble. If the knob doesn't turn its a shock problem they will replace the entire shock under warranty.

Had the same problem due to corrosion from salt, de-icer, etc. I called my Rancho dealer, they order new ones, they called me the next day, I exchanged them at no cost. Very EZ.

The knobs are not the problem......it is the valve behind the knob that the knob pushes on the seizes. The assembly does not seal very well and lets moisture in. The first thing I do with 9000's before I install them is turn the knobs to setting 1, remove the knob, fill it up with silicone, apply a small amount of grease to the knob and re-install the knob. I have never had moisture issues after doing this. In the case of a seized valve, remove the knob and use a hammer and a punch to break the valve free....using some penetrating oil helps to work the valve free again.

Don't waste your time, just get new ones. Lifetime warrenty!

1) Yes, you will have to remove the front shocks to do this.

2) You must remove the allen head screws and then the knob assembly comes out.

3) The knob assembly that is held on by the screws DOES have to be removed to access the valve.

Failing all that, do what Behrman said, the Rancho warranty coverage is excellent.