Karcher Pressure Washer problem

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  #1  
Old 02-18-05, 01:33 PM
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Karcher Pressure Washer problem

I have a Karcher Model K4400G pressure washer - 1900 psi, 2.2 gpm, 6 hp B&S. Just this year I noticed that when I release the wand trigger - therefore stopping pressure washing (high or low) - for instance when I need to move the pressure washer, I noticed that a lot of water flows out of the pump assembly - the unit between water supply and high pressure outlet. I assume there is a gasket in there that must be bad. My motor alos bogs down when I do this - it doesn't cut off, but bogs pretty heavily. My owner's manual states that this may be damaged or worn water seals - contact service center. Is this not something I can fix myself? Seems like if this is the main gasket in the pump it would be as simple as taking out the bolts, removing the old seal and replacing it with a new one. Anybody got any ideas on this??

Thanks in advance for the help!
 
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  #2  
Old 02-19-05, 12:25 AM
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Could be a few things, but first thing that comes to mind is the unloader valve. It is a common problem. The unloader should relieve the engine when you release the trigger and the engine shouldn't lug. You might remove it and clean it, or replace it.
 
  #3  
Old 02-19-05, 05:37 AM
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Thanks Cheese! One question - how do I find the unloader valve - my owner's manual doesn't have a schematic showing me all the pieces and parts. I'm afraid this question may be too hard to answer in words - and that it may put me in the "shouldn't be working on this" category...

Any advice would be appreciated!
 
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Old 02-21-05, 01:17 AM
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It's hard to tell you where the unloader is or what it looks like. They are different from one mfgr and model to the next. It should be accessible from outside the pump, probably has a hex shape so that it can be unscrewed, and usually is threaded into the side of the pump...many times it is brass. You should be able to do this if you have any mechanical ability at all. Finding and identifying it might be the worst part, lol.
 
  #5  
Old 03-07-05, 10:46 AM
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Finally got my pressure washer back from a friend to try to find and clean/fix the unloader valve. There was a black cap that covered what I think is the unloader valve - the valve itself had a plastic out piece that was screwed into the side of the pump with 2 torx bolts. I removed this and found a small brass piece on the inside that had a spring on it - another aluminum looking ring was fitted around the spring - it had 2 very small holes in it - about the sise of a toothpick. I took the whole thing out, wiped clean with a dry cloth and sprayed with some WD-40. Didn't fix the problem...so I'm wondering what exactly I may be able to do to clean this up more and if this in fact sounds like the actual unloader valve.

Honestly, I consider myself fairly mechanically inclined - but looking at the piece I pulled out, and the cavity it fit inside, I don't know what it could even be doing or how it works. There was a square shaped piece of metal the spring fit against inside the cavity - I used a screwdrive to see if it would move, and it seemed like it was a fixed piece. Anyway, I googled and tried to find an explanation on an unloader valve and didn't have much luck...

Thanks again for the help!
 
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