Even when the washer is working, the pressure does not appear to be high...
I am assuming this is electric powered and if so your motor is overheating and cutting out. There are many reasons why this can happen. Does the motor sound slow or underpowered from when it was new? If so you may have lost a field coil so only 50% of the motor is working, you will also notice a drop in pressure as well. If not then it could be the bearings in either motor or pump head (should make a whining sound though). A failed bearing will mean the motor working harder and overheating. It could also be the pressure valve sticking or the spring inside has broken and doesn't allow pressure to build so the motor runs faster and then overheats...
SOURCE: karcher k2400hh pressure washer, water pressure cuts out.
Hello cikanek:
Try this:
From your posting, I assume you have removed the splash cap and the nylon bypass valve cover. Connect the water supply to the pump and connect the high pressure hose and wand to the pump outlet. Wad up a small towel and place it over the bypass valve opening to catch the valve insert when it pops out. With the engine throttle closed, pull the starter cord several times to see it the valve insert will pop out. If it doesn't come out after two or three pulls, set the throttle to low and start the engine. I have performed this procedure a number of times and the valve insert always pops out. There is no real danger of the valve parts getting seriously airborn since the actual pump output volume is very low (2.5 Gal/min).
Good luck,
Ed
SOURCE: Karcher G 3000 BH Engine Pumping Problem
This may not be a motor problem. It sounds like your pump is not working properly and the motor is just following the pump. First thing to do is check for leaks in the pump, wand hose, gun etc. It may also be a blown water seal inside the pump.
SOURCE: Lack of pressure after releasing the trigger on the wand
Hello awcockerill:
This sounds like the bypass (unloader) valve is sticking. Here is a diagram of your machine's pump. On page 2.4 see part #1. The top of this assembly is a black plastic cover. Remove all of assembly # 1 carefully. Under that is part #8. This is the bypass valve. You need to pull this out, check that the o-rings are not bent, worn or damaged, then lube it good with a VERY VERY good waterproof grease. Re-assemble it and all should be well. The part numbers are on the diagram but where to get them depends on were you live. Karcher web site may give you a number to call. Good luck.
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