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I hav a dayton pressure washer with a 10hp tecumseh engine, model hm100. when im using it and let off of the trigger.the engine does not rev down like it should when it meets its pressure limit. what can i do to make it work right?

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Hi,
I have seen this here all day, so I'm going to let you know what my first thought is.
It seems so simple that I figure you probably tried it, but I'll give it to you anyway...
There should be a pressure sensing switch that will kick the motor back. I think that the unit is not building enough pressure to activate the switch. I may be getting worn and not be able to build the amount pf pressure that it once did. The switch may have went bad... anyway try adjucting the switch to a lower pressure and see if that works... or check out the switch and if it still will not activate then the switch needs to be replaced.

Heatman101

Posted on Feb 08, 2010

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Posted on Jan 02, 2017

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