Disassembly showed it to be a different problem than last time. These old posts contained the info I needed to make the repairs. Last time, a gear had slipped out of adjustment. This time, the pot-metal gear mounted on the odometer (not the trip meter) shaft was spinning. This appears to be a rather common failure of some speedos.
Here's how I fixed it:
Disassemble the speedo as per the directions given by Jim:
http://real4x4forums.com/PinzgauerBBS/v ... t=odometer
Here is a discussion of diagnosing and repairing the pot metal gear slipping on the shaft (note the Porsche link):
http://real4x4forums.com/PinzgauerBBS/v ... peedometer
Here are some additional comments to add to the link to the Porsche speedo repair.
The Porsche repair seems to indicate that you remove the odometer roll from the speedo frame. I did not see a way to do this. I did apply tape on both sides of the odometer rolls. I removed the screws securing the dial face. Then, while carefully lifting the pot-metal gear as far out of the frame as possible (the dial face limits it - be sure it's all the way up near the dial), I used a needle-nosed plier to ever-so-slightly crimp the center flange of the gear. This is difficult, as the flange around the shaft is probably 1/16" deep, so a good pliers is helpful. I crimped it twice, 90 degrees off. By test-inserting the shaft into the gear, it was evident that I had tightened the fit. It's supposed to be a press-fit.
I also sanded the last 3/8" of the shaft, prior to reassembly. It was a real pain to reinsert the shaft. I had to fiddle with it, lining the last few pieces up with a screwdriver from the opposite end. Eventually, things aligned, and I used a tiny hammer to drive it together. It works!
Lastly, when crimping the trim ring back in place, I enlisted a friend. He pressed the speedo, dial down, onto a bench covered with a cloth (to prevent damage). Working about an inch at a time, I held a large johnson (flat-blade) screwdriver blade on a tangent to the trim ring, and pulled it around the trim ring. I'd do this a couple times, gradually increasing the angle of the blade to roll the trim ring back into place. He'd turn the speedo, and I'd repeat it. We worked our way around it twice, and it looks like the factory job.
I know, I know, pictures would be great. But I don't know how to do that.
Sorry. If ya got questions, ask.Paul