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Checking RPM on Farmall A

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John in KY

04-05-2001 13:15:37




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Hey guys. I have a 6V Farmall A witha Woods mower that I recently purchased. It runs great but the governor does't seem to be working. I decided to check the adjustments on the governor and carburetor. While trying to check the RPMs with my multi-tester however I get very erratic readings. I have taken into account the positive ground but to no avail. It has new coil, plugs, and associated wiring. The ignition system and electrical system all seem to be working perfectly. So why would I not be getting a good RPM reading? Do I have a bad multi-tester?

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Dave G

04-05-2001 20:26:28




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 Re: Checking RPM on Farmall A in reply to John in KY, 04-05-2001 13:15:37  
I don't know about you test equipment but if the engine is not running at a constant rpm here are 2 things I ran into on Farmall Bs. 1) The high speed adjustment screw on the top of the governor can sometimes wear off at the tip and not always provide a positive high speed stop inside the governor causing the top speed to float around. Check and get new screw if necessary, 2) At the carburator check where the linkage attaches. The arm where the linkage attached is riveted to the carb shaft with a hollow flange rivet and sometimes this arm comes loose and the speed goes crazy.

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John in KY

04-06-2001 18:47:01




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 Re: Re: Checking RPM on Farmall A in reply to Dave G, 04-05-2001 20:26:28  
Thanks guys. I'll look into what you suggested. The egine is running smoothly at a constant RPM. It's just the indication that's all over the place. It's impossible to check if everything is adjusted correctly. I'm beginning to think it's my meter. Thanks again.



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Dave G

04-05-2001 20:26:13




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 Re: Checking RPM on Farmall A in reply to John in KY, 04-05-2001 13:15:37  
I don't know about you test equipment but if the engine is not running at a constant rpm here are 2 things I ran into on Farmall Bs. 1) The high speed adjustment screw on the top of the governor can sometimes wear off at the tip and not always provide a positive high speed stop inside the governor causing the top speed to float around. Check and get new screw if necessary, 2) At the carburator check where the linkage attaches. The arm where the linkage attached is riveted to the carb shaft with a hollow flange rivet and sometimes this arm comes loose and the speed goes crazy.

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JD mech.

04-05-2001 19:52:25




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 Re: Checking RPM on Farmall A in reply to John in KY, 04-05-2001 13:15:37  
I use a Fluke 78 multimeter at work to test rpm. It uses an inductive pickup. It can be set for 2 stroke or 4 stroke engines. Our lawnmower mechanic loves it. You can also get magnetized tape and put it on the end of the crankshaft. You will need the lazer gun to go along with it though. If you know someone who works at a diesel pump shop they might let you borrow the tape and gun. Or any modern ag shop should have a Fluke 78 especially a JD dealership.

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