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  1. #1
    Elite Member tallyho8's Avatar
    Join Date
    Aug 2004
    Posts
    3,331
    Location
    Katrinaville LA west of Westwego east of Ama south of River Ridge north of Boutte, above sea level
    Tractor
    Yanmar 1802, Kubota L4400

    Default 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.
    Attached Thumbnails Attached Thumbnails -tach-jpg  

  2. #2
    Elite Member wushaw's Avatar
    Join Date
    Mar 2005
    Posts
    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default 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.

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