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08-17-2008, 03:48 PM #1
- Join Date
- Aug 2004
- Katrinaville LA west of Westwego east of Ama south of River Ridge north of Boutte, above sea level
- Yanmar 1802, Kubota L4400
Repairing a tachometer
The tachometer on my Ford/New holland 4610SU was fluctuating wildly so bad it was unreadable. I priced a new one for $200 and decided I would try to fix the old one first. I disassembled it and found that there was extreme play in a bushing causing the fluctuation.
In the photo there is a small shaft about the size of a small sewing needle that goes into the marked hole. Evidently there was a bushing in this hole at one time but now the hole is 5 times the size of the shaft allowing it to wobble.
First I planned to silver solder the hole up and then drill a hole the necessary size in the center but dropped that idea because I had nothing precision enough to drill the hole exactly dead center. So I mixed up some epoxy and filled the hole and cut the end off a small paper clip and rubbed a little vaseline on it and stuck it in the center of the hole. When it hardened, I pulled out the piece of paper clip leaving a hole close to the perfect size and reassembled the tach.
It is working much better now but I have no idea how long my epoxy bushing will last. It is not perfectly steady because I probably didn't have the paper clip dead centered but it is good enough now.
Total cost: Part of my old tube of epoxy that costs $1.98.
08-17-2008, 05:39 PM #2
- Join Date
- Mar 2005
- Bristol Texas
- Kubota L2800, 15 hp 372 Mitsubishi
Re: Repairing a tachometer
Have you tried lubeing up the cable since your repair.Kubota L2800HST, Mitsubishi 372, bh75, 45" Agric tiller, 5' home made disk, 42" Bush hog, PHD, 66" Cammond BB.