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Oliver 550 tachometer

super99

super99

Well-known Member
The last time I used the 550, the tach needle was jumping all over the dial. I shut it off and restarted it and it worked like it should. I pulled the cable out and lubed it, put it back in and I can't turn the cable either way by hand. Something is stuck inside the tach. Would it do any good to take the tach off, turn it upside down and squirt some penetrating oil inside it or just get a new one?? I haven't tried to start it yet, If I put a drill on it to try to turn it I'll probably ruin something on the inside. Thoughts???
 
I have seen the brass input piece that the cable drives, seize up. You can remove the head and give the drive a light tap and free it up. Then just lube it and should be good to go. Mark.
 
.I'd leave the drill on the bench.
cvphoto65902.jpg


cvphoto65903.jpg

The black squeeze bulb is for lubing speedo heads when the needle goes nuts. The oil in the kit was red, maybe the same as marvel myst. oil, just fill the tool, slide it on the speedo head and squeeze.

The other tool is not necessarily an approved tool. Some cars were about impossible to get the cable off the head so I built this cheater to give the cable a shot or two of grease from the bottom.
 
Is the tractor inside a heated garage? If not did you use grease to lube it? In the cold grease can make the cable turn fairly hard. Do you have a small screwdriver that fits in the diagonal of the square drive of the tach? That is what I use to check ease of turning. I would recommend trying to work some auto trans fluid into the turning part at the drive connection of the tach head. Beyond that there is not much you can do. If you can’t get it to turn freely I would recommend just disconnecting it if you need to use the tractor otherwise you risk damaging the drive cable or even the drive gears on the engine end.
 
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