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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
KarcherKarcher 620MD.I.Y, D.I.Y ToolsPressure Washer Karcher Motor
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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Karcher 620M PW - Switch Issue & Troubleshooting