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Tom, Technician
Category: Small Engine
Satisfied Customers: 25920
Experience:  Honda Platinum Technician
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I have a Karcher K5.55 and it pulsates when not in use and

Resolved Question:

I have a Karcher K5.55 and it pulsates when not in use and only operates at half pressure when in use
Submitted: 6 years ago.
Category: Small Engine
Expert:  Tom replied 6 years ago.
OK has the unloader valve been checked this will cause this issue.
Customer: replied 6 years ago.
Which is the unloader valve and how do you check it, what is their to check?
Expert:  Tom replied 6 years ago.
These are known to get stuck open and cause this issue . Takes about 40
minutes to fix and you will save yourself about 150 dollars on a repair . Here's how. If you pry off the silver cap, remove the black cover, use an allen wrench to remove the two "star" screws (or you can remove the four engine mounts and remove the whole engine), lift out the white plastic part with the brass needle & spring, finally lift out the stainless steel piston or like I had to start up the engine (make sure you have the water hooked up and running) and watch the piston be shoot out (I placed a towel over the piston before starting the engine). Then you can put white lithium grease all over the piston and reassemble.

Hoped this helped

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