The pressure switch or sensor is actuated by the water pressure when flowing like in a camper. only much higher settings. it should be on the pump housingthere should be a couple wires going to a box which cuts the motor on and off.
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usually when the power washer pressure stops the machine is running out of water. the sweep function uses a little more water than the round wash tip. Make sure there are no leaks in the supply hose and that the supply faucet is turned on all the way and has plenty of "flow". also make sure the water connection at the washer is not leaking. use a new rubber washer to make a good seal on the supply hose on both ends. if either end leaks or can **** air, just a little bit of air into the pressure washer will cause it to loose pressure.
Hi and welcome to FixYa, I am Kelly/
First off, remove the water supply hose from the power washer and locate the in line filter. Most of them are a plastic screen stuffed into the plumbing just behind the hose washer. Others have a short stand off and the filter / screen may be where the stand off attaches to the pressure washer. Others units have in in line sump that usually has a blue or red cap that you remove to clean the sump. Find the filtering mechanism(s) and clean it.
After doing this... attach the water hose loose to the power washer and turn on the water supply hose. Wait for all of the air to purge from the water supply hose. Then tighten the water supply hose. After that... Squeeze the wand trigger until all the air purges out of the high pressure hose and you get a solid stream of water with the unit off. Once you get a solid stream of water with the unit off... power the unit up and see if the high pressure hose becomes rigid / charges with high pressure. Next.... cycle the wand trigger 1 second on... and then wait for the hose to charge again. Do this multiple times. What your doing is forcing the un-loader / relief valve to stroke in the pump. Until the un-loader valve stokes un-restricted; you will have pressure problems. Next after the hose is fully charged... cycle the wand trigger very rapidly until you get high pressure each time you cycle the wand trigger. At this point your done and can proceed with patio cleaning.
Should this NOT resolve your problem.... get as much water out if it as you possibly can and pour a few ounces of engine oil into the water inlet. (Easier said than done... but you have to get oil into the pump and then let it sit over night. once you have oil in the pump pull the recoil 2 times with the ignition off just to force oil through the pump)
The next day you go through the same routine as stated above. This brings about 80% of the stubborn ones back to life again. Should it still be fussy after doing all of the above... you will have to replace the unload-er valve. If you removed the un-loader valve for any reason... you must clean out the pump housing and lubricate it and the un-loader valve with white grease (<-Available at any automotive parts source) BEFORE reinserting either the old one or a replacement un-loader valve. If you attempt to use the old one with lubrication.. make sure to remove any debris from the springs and wipe the seals clean with a PAPER towel before lubrication.
If your power washer is like mine, there is no drain plug for oil. You have to siphon oil out with plastic hose. Do not turn machine on it's side or upside down or oil will run into carburetor. Engine takes 10W30 motor oil, level is bit more than half way on dip stick. Pump takes SAE20 or SAE30 non-detergent motor oil and fills pump about half way.
I am assuming that by feed hose you mean the water supply inlet. Well if you connect the water supply inlet and the gun is closed, then the machine will stop. This is normal. Now if you open the gun and the machine still stays dead...then the control valve that operates a micro switch is stuck in a position that leaves the micro switch off.
So you must open machine and see a spill valve(pressure control valve)...this will have a cap on it with a wire. This wire is feeding electricity to the micro switch. You can lubricate the spill valve, but myself I change with a new one. You must also check that the micro switch is OK. To open the outer cover there are screws which are normaly TORX ..T15 size. Another reason for the machine to stop dead is that the outlet hose is blocked or the wand( Gun ) is blocked.
If there's a lot of sediment in your water supply, there's a chance that sediment has gummed up the pressure switches. I'm assuming it has a full power switch and high power switch. It runs on full power until a pressure switch is satisfied, and runs on low power to slowly build the pressure back up, at which a second switch is satisfied from the pressure and turns the motor off. These things are not easy to work on, and are made of metal probably too fragile to try any chemicals. You should probably contact the manufacturer.
There is a pressure switch to cut the motor once target pressure is reached. I.e. when the nozzle is closed. It's a black cheap plastic thing, right in front of the pump body. It has a white plastic lever to trip the switch. It was sticking intermittently on mine. the simoniz 1600 is quite a cheap peace of ****, needs fiddling around every time I use it
When trigger is shut, pressure builds up in machine and this activates a control-valve or often called a Spill Valve. This Spill Valve compresses with the built up pressure and switches off a micro-switch...which in turn stops the machine. Now when this Spill Valve gets faulty, it starts compressing and de-compressing undr pressure. Thus the micro switch is activated on and off. That is why your machine is starting and stopping. Now this Spill Valve also controls pressure. So to fix the fault you must change the Spill Valve with a new one. Myself I rarely service Spill Valves. You can locate the spill valve after you open the cover. The spill valve is usually covered with a plastic cap that contains the electrical micro switch. I do not know what model you have....but sometimes to improve the pressure you must also change the suction and delivery valves. But in most cases like yours...it is only the Spill Valve that is causing the starting and stopping and the low pressure.
I cannot for sure understand your problem. You say, you do not know how to WORK power washer. Does WORK mean FIX...or USE???? I will assume that you wish to know how to use it.
First without water connected and without gun connected...switch on the machine. If it turns, then this means the electric motor is OK. Now connect the hose and gun. Connect water supply. Now always start the machine with gun open. This will help to remove air from system. When pressure builts up, close gun, and machine must stop instantly. If machine does not stop, open the gun again and switch off the machine. If the machine continues working when the the gun is closed, this will result in a lot of damage. I do not know what model you have, because also there are old models that when gun is closed, the machine keeps running. I assume your model is recent. So the machine will stop when gun is closed. Now when finished, switch off machine and electricity. And most important release pressure from gun. Do not store machine with pressure still in it. This will damage machine and it is not safe.
Now if you have detergent, this can only work on low pressure. There are bigger machines that detergent works on high pressure. But the normal system is that detergent works on low pressure. Also before storing, pass fresh water to remove all detergent from pump of machine. Never store a machine with detergent in its system.
sounds like the unloader is stuck onthe machine which pushes against the micro switch.
follow the instructions for a parts diagram. www.karcher.com
click on europe
then click on international
go to service and spare parts will open, click spare parts
then put in k6.50m on there will be another number on your machine 8 digit , easy way to find your machine, could 10 different models
try running the machine without the hose attached if the machine runs ok then it is probable the there is a blockage in the nozzle if the the machine still cuts out then the pressure switch will probably be stuck or faulty this switch will be inline with the on/off switch and the motor it can be checked using a multi meter after dissconecting the power.