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Tractor Talk Discussion Forum

Erratic Throttle on Farmall H

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Adam Zich

09-22-2005 20:49:08




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I went to start up the H the other day and all of a sudden it started to throttle up on it's own. It seems to idle fine but as soon at you give it any throttle at all it throttles up to full speed again. I'm thinking it may be somthing with the govener. Not sure what to look for, just thought i'd ask. Thanks




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cootbruce

09-23-2005 07:14:30




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 Re: Erratic Throttle on Farmall H in reply to Adam Zich, 09-22-2005 20:49:08  
This may sound strange, but when my OC3 was doing that....I was told to change the spark plugs before even looking at the govenor....New plugs made it run great, no governor problem....go figure



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RustyFarmall

09-23-2005 04:18:13




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 Re: Erratic Throttle on Farmall H in reply to Adam Zich, 09-22-2005 20:49:08  
Most likely the spring has broken in the governor. Remove the cover plate and have a look.



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Bob

09-23-2005 10:17:19




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 Re: Erratic Throttle on Farmall H in reply to RustyFarmall, 09-23-2005 04:18:13  
At idle, there is no tension on the governor spring. As you "throttle up", tension on the spring is increased to overcome the centrifugal force generated by the weights.

Therefore, if the spring breaks, the throttle position will return to idle.

However, if one or both weights get broken off, there is less (or none at all) centrifugal force to counteract the spring tension, and the engine will overspeed.

Also, if the governor fork gets damaged, or the needle thrust bearing fails, the engine can overspeed, out of governor control.

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Adam Zich

09-23-2005 13:08:56




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 Re: Erratic Throttle on Farmall H in reply to Bob, 09-23-2005 10:17:19  
It doesn't "Over Speed" it just throttles up on it's own. But it never runs faster then it would at full throttle. I'll just have to pull the plate and check the spring and weights.



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Adam Zich

09-23-2005 05:41:32




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 Re: Erratic Throttle on Farmall H in reply to RustyFarmall, 09-23-2005 04:18:13  
Isn't there more then one spring in there?



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RustyFarmall

09-23-2005 05:58:51




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 Re: Erratic Throttle on Farmall H in reply to Adam Zich, 09-23-2005 05:41:32  
Nope, just one.



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