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sounds like you have a unloader valve problem or a crack in the pressure manifold housing between pressure outlet and unloader valve assy allowing unloader to cycle on/ off
or some dirt trapped in the unloader valve seat , make sure you have good supply of water - ie good flow from tap to pump
try cleaning unloader 1st and fitting in line tap filter
The most common problem is the unloader valve.The valve that you use to adjust the pressure need to come out and then free up the unloader valve with some penatrating oil and maybe even some emery cloth.If you cant free it up then it will have to be replaced.
the part number is on page 9 of the drawing spill valve 45910400 hope this helps , we usually use some good quality silicone grease to lube the valve ,
Hi: Cleaning it is not enough. You need to make sure the o-rings are in good shape and grease it with a very very good waterproof grease. Here is a schematic of the pump. The unloader is parts 7 to 13 on D-2
Hi ruthkapres: Here is a diagram. The unloader/spill valve is #12 on page D2 or F2 depending on your model. You must pull it out, inspect the o-rings for dents or tears and make sure the valve is lubricated with a good water proof lubricant.
Hello: Here is a schematic. On page 2.1, part #1 is the unloader valve. You need to remove it and lube it with a very good waterproof grease. Also insure the O-rings are in good shape and the spring action is working.
Hi The unloader valveis HERE If you go to D-2 it is part numbers 8 to 13. If it is stuck it is not only important to free it up but also make sure no o-rings are damaged and lube it with a very good waterproof grease. Good luck.
The unloader valve usually is replaced. I dont know if you can get o-rings for it. But if you want to take it apart, there will be a crown or cap style nut just below the spring. Unscrew it completely and you will be able to remove the spool. There is just a series of o-rings on it.
I had the same problem with my Karcher. The recall was lifted Aug. 0f 2007. Tried numerous people at Karcher....head of Customer Service, vice president, etc. No one returns telephone calls not even cutomer service....poor, very poor customer service. Thinking about calling Germany.
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