Tecumseh HM100 governor problem?

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  #1  
Old 08-29-14, 06:20 PM
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Tecumseh HM100 governor problem?

I have a 17 year old 5000-watt Generac generator that is powered by a Tecumseh HM100 10 HP engine that Iíve use as emergency backup for my home. Itís been a great little genny over the years but recently developed a problem that I need your help with.

Normally when I start the engine and let it warm up and stabilize it runs at a no load speed of around 3750 RPM. Yesterday I started the generator up to exercise it and noticed that when I applied a load from a 1600-watt hair dryer it loaded the engine to the point where the RPM dropped to around 3450 RMP and the speed never increased. When I removed the load the engine returns to the normal 3750-RPM, I never noticed this before.

I suspect that it may be the governor but Iím not 100% sure. I know the basic function of the governor is to increase or decrease engine RPM depending on load but it does not seem to be doing just that. The engine RPM never increased when the load was applied, Is there anything way I can check the operation of the governor or anything I can adjust before pulling the engine apart to check the internal workings of the governor?

Any suggestions or thoughts would be appreciated. Thanks to all.
 
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Old 08-29-14, 09:58 PM
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On a generator like that, most likely you just need to increase the governor static tension spring to add more tension until the loaded rpm is 3600.
 
  #3  
Old 08-30-14, 01:14 PM
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Thanks for the input, I'll give that a try and let you know the results.
 
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Old 08-30-14, 03:17 PM
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Problem solved! Turned out to be the hole in the throttle lever where the governor linkage goes had worn the hole bigger and was causing a lot a play in the linkage. The fix was to move the linkage to another hole in the throttle lever and readjusted the governor accordingly. It now runs at 3650 RPM at no load and 3600 RPM at full load with almost no fluctuation in the RPM's. 17 years old and I still can't kill it, I wonder if I'll get another 17 years out of it...lol

My thanks to Cheese for the input.
 
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