Can rotate shaft by hand until it locks up. Can get one pull with cord as well, but will lock up. Ran water to pump and pressure is relieved, but engine still only turns 3/4 rotation before locking up. Tried removing pump, but it is connected to the shaft somehow and just spins with the engine when loosed up. Pump problem? Engine seems to have compression with the little bit of rotation I get by hand ...but hits a blockage of some sort and locks up
SOURCE: Karcher K 3.68M Electric Pressure Washer. Wand trigger Locks Up.
Sounds like the pressure valve is broken thats why you cant depress the trigger , the valve is on the pump , i would suggest taking it to a repair shop as they are fiddly things to fix
SOURCE: Ex-Cell VR2500 Builds Pressure but Won't Spray
I have a similar problem and diagnosed it to be a problem with the gun. I spoke to a technician that services this pressure washer and he walked me through all the diagnostic steps. The pump is working because there is pressure being built up and the gun sort of works because you can get water out before the washer is started. The technician said that the mechanism inside the gun is either clogged or broken. I am going to Home Depot or Lowes to purchase a new gun and will try it tonight. Guns are only about $30-40. He said generic is fine as long as the thread matches and PSI is in range. Good luck!
SOURCE: Motor seems to be locked up!!!!!!!!
It may be your engine, but it may also be the water pressure. Try this: Hold the trigger down while pulling the recoil starter. This acts as an unloader for the pressure washer, and may allow the engine to turn over. There is also an oil level in the pump as well as the engine. Check both levels.
Just a thought, but I've been there. Best regards, W/D
SOURCE: I want to remove the 4gpm pump on my pressure washer.
HI, It sounds like it is just stuck on the keyway as these can be very tight. You need to force the pump of evenly on either side and should come of if patient.
Testimonial: "I'm sure the answer is correct. Over time my use of harsh chemicals no doubt corroded the key-way."
SOURCE: won't build pressure
It sounds to me that you may have a broken piston ring. That would cause instanainious pressure loss. If not that it is a damaged seal between the high and low sides of the pressurized water. Good luck!
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When turning the crank by hand .... it will rotate almost 360 degrees before stopping. Rotating it back and forth in this position I can hear compression but engine will not rotate any further .......
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