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Lots of possibilities. Inlet filter might be clogged. I once had a lizard crawl into a water feed line, totally blocked the feed. Check valves might be stuck closed. Discharge hose might be plugged. Pump might be trashed ( if it is a vertical engine it is probably a throw away pump) Nozzle might be plugged.
Disconnect the hose at the discharge and turn on the water supply. It should have a stream of water even without the motor running. That will check the inlet filter, feed pipe and check valves.
Water comes out the nozzle, but low pressure? ( more than when the motor is not running)
I would check the check valves and the unloader.
If the amount of water coming out the nozzle is the same when the motor is running or not running.
Either the key that connects the motor shaft to the pump shaft is sheared, or the pump is trash.
No water comes out the nozzle would indicate a clogged inlet filter or blockage at the gun valve or nozzle.
What I've always done is just disconnect the water hose then start the washer and pull the trigger till no more water comes out. You don't want to run it very long at all after there's no more water though, you can quickly overheat the pump if it is ran without a water supply for too long. I've been doing this for the past 3 years with one of my washers and haven't had any problems with the pump.
If the pressure unloader is not working correctly and/or the nozzle is partially clogged with debris, the engine will be overtasked. Try lowering the pressure by turning the pressure knob to lowest setting and test. If the engine continues to run, gradually increase the pressure. Try using the washer set to about 75% of rated capacity and use max pressure for stubborn stains. Using any machine at max will shorten the life of components. If lowering pressure does not help, then unloader is faulty or stuck. Try storing the unit with oil in the pump. Remove both hoses and infuse oil into water inlet intill all the water is displaced (let set for day or two). Good luck
Make sure all of the water is bleed out of it buy holding trigger down with motor not running until theres is not more bubbles or air that comes out..Make sure where the inlet for waters screen is not plugged..You may have to back flush washer to clean out or to unstick the pressure valve..Hope this helps you and have a great day
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