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