Just thought I'd post this incase it can help somebody. The tach quit working on the 1850 Diesel while I was grinding feed during the polar vortex. I thought that drive pin broke. I got around to taking it apart yesterday and it wasn't broke. I pulled the 90 degree angle drive right out and stuck a screwdriver in the drive end. It didn't turn the driven shaft. I took a punch and drove the driven shaft that the cable hooks to,the gear and soft plug right out.
The gear was stripped off,but only along the inside half. I drove the little shaft out of the gear,turned it over and pressed it back on. I tapped the whole thing back in and it turned OK. I put the soft plug back in,but had just a slight catch in one place when I turned it the right way. It turned backwards smooth enough.
I went ahead and put everything back together and started it up. It worked. I ground two loads of feed with it and it must be running smooth,the needle sits right there steady as a rock with no jumping around.
The gear was stripped off,but only along the inside half. I drove the little shaft out of the gear,turned it over and pressed it back on. I tapped the whole thing back in and it turned OK. I put the soft plug back in,but had just a slight catch in one place when I turned it the right way. It turned backwards smooth enough.
I went ahead and put everything back together and started it up. It worked. I ground two loads of feed with it and it must be running smooth,the needle sits right there steady as a rock with no jumping around.