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Mend Karcher 620M Pressure Washer Motor

Karcher 620M PW not staying on when switch released?

My Karcher 620M will operate almost normally if I keep the foot operated switch pressed down, although every few seconds it will stop and restart. Releasing the switch will stop the motor instantly. I had stripped it to replace an O ring which had distorted, before that it was working fine apart from the leak. Any ideas?

Thanks in advance...

DavidL
July 2013
This may be useful:

https://www.youtube.com/watch?v=pu4IqLnjNlo

http://www.manualslib.com/manual/286346/Karcher-K-620-M.html?page=2#manual

XXX
May 2016

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