If it is in the Z - axis, take off the 4 screws located on the top of the joystick and you should see a spring in there, either it is getting weak or it is broke.
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Man, I'd hate to see these joy-boxes you guys have, mine must be either older or newer, it has taken one he11 of a pounding over the years. Never had to fix anything on it until about a month ago. The Z spin was slipping, so you could turn the knob, but it wouldn't move. I took the top off but found that the set screw was tight to the center screw. So, after a little playing around, I discovered that the switch portion of the knob could be pulled straight up and away a little bit. The switch portion has a recessed hex to fit over a nut on the shaft. The nut has a set screw, that was the one that loosened up. I took a utility knife, shaved away a little of the bottom portion of the plastic knob cover so I could get in there with an allen wrench and tightened it up. I then pushed the switch portion back over the nut, then screwed it all back together. No problem. This thing has been dropped enough times, and hard enough, that the edge all around the knob is bent-over, distorted, all the kind of thing. I did have to adjust the Z because I played with that first, hoping that was where the problem was, but it was not touchy in the least. I would guess that I had about 15 to 20 degrees of 'zero' on the shaft, that is quite a target to have it hold zero. This is the one that B&S put on the machine at the retrofit, I would guess 6 years ago or so, maybe longer. I would have to dig out the records and I don't feel like it.
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Originally posted by AndersI
I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.
Mine was drifting in the Y-axis recently (while Enable was pressed). Take the box cover off, there are "switches" for X and Y that can be adjusted w/ set screws. You'll just have to play with the tension on those screws to get it right. If it's in the Z-axis, same principles at work (but you have to take the "stick" apart.
The four screws referred to on the z axis fixes would be the four screws on the top of the joystick itself to access the spring inside. These wear out or even sometimes break. I have a couple made that I keep around.
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