I've just completed rebuilding the engine in my sisters 1250. The hour meter was not turning so I figured before I replace it I may as well see what "makes it tick". Or in this case, what kept it from ticking.
I took some pics so anybody interested in trying to fix one might jump in. I also reset the needles to "0" for the fresh engine, you can see in the one pic they merely press on the shaft with spring tension.
*pic 1 shows the small pick i used to pull the flange back/open on the face ring. (it's quite soft and was east to do)
*pic 2 shows the ring removed
*pic 3 is obviously the inside, in my case it just need a light blast of air to clean it out. (sorry i cant say any of your meters will be repaired as easily
)
*pic 4 shows the needle removed, it simply pulls straight off the shaft with a little tug.
*pic 5 shows i used a flat drift pin to simply "roll" the edges back closed around the circumference of the gauge when finished inside.
*pic 6 is the finished piece. you can easily see it was done, but not when placed back in the dash.
*and finally pic 8 shows the "new" zeroed hour meter ready for another 45 years of service!
and last but not least, the tractor proper.