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Rick
Rick, Small Engine Technician
Category: Small Engine
Satisfied Customers: 3844
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
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When switching on Karcher K620M washer it will only start to

Customer Question

When switching on Karcher K620M washer it will only start to work when I set to mix on the lance and then move to max on the lance. When I release the trigger I have to repeat. I will not operate either the foam pot or the patio rotating brush
Submitted: 1 year ago.
Category: Small Engine
Expert:  Curtis B. replied 1 year ago.
Your unloader valve is sticking.
Expert:  Curtis B. replied 1 year ago.
Here is video showing how to get to it.
Expert:  Curtis B. replied 1 year ago.
https://www.youtube.com/watch?v=pu4IqLnjNlo
Customer: replied 1 year ago.

I advised I had previously changed the spool valve shown in the you tube video link you provided

Expert:  Curtis B. replied 1 year ago.
The spool valve has to shift in the housing, is it free to move?
Customer: replied 1 year ago.

By shifting do you mean it can be easily removed from the unit

Expert:  Curtis B. replied 1 year ago.
Yes,and has to move back and forth.
Customer: replied 1 year ago.

Yes it does

Expert:  Curtis B. replied 1 year ago.
Let me opt out, I can't think of anything else.
Customer: replied 1 year ago.

One other point to note but if I remove the lance from the gun and press the trigger the pump kicks in but when I put the lance back on it shuts sprays out water without the pump.

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