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YOU MUST SHUT OFF WATER FIRST!! Because you need to replace the valve stem washer. Most likely OO washer size, black hard rubber washer is worn out.
Remove the excursion (handle) one or hot and cold. Phillip screw or allen nut back of handle.
You will see a brass valve stem the handle was attached to. Use a crescent wrench and unscrew the stem and pull to remove.
Ar the bottom of the stem you will see the black washer. Remove the screw holding the washer in and replace with new. Reverse steps to install.
fuel filter housing on driver side of motor. need the correct size of socket to remove the lid. unscrew lid and pull straight up to remove filter. remove old filter from lid and install new filter and seal. drain old fuel/water from housing. then reinstall filter into housing. tigthten lid then make sure the petcock is closed from draining it earlier. bump the starter a couple times to fill the filter housing then start engine. clean any spilled fuel and your done.
I came across a lot like this problem as an expierienced technician on power washers.
Most probably there is a capacitor, which when faulty, it gives this condition.
If you know with all respect to remove the pump from the electric motor, try starting without load.
It is possible that the problem is in the pump. If the electric motor finds that it cannot turn because the pump or pump pistons are jammed...it will hum and stops. I hope you did not do this very often...because you may have damaged the electric motor for good. Also important never put on a power washer without water supply. To test you can feed water but remove the gun...so that there is no load. Hope it is the capacitor in your case. Now the capacitor gets faulty from another fault. One of them is that when you were using the machine and closed the gun, the power washer stayed getting on and off all the time. This will damage the capacitor for sure. If you make a new capacitor ad machine starts and stops when gun closed....there is problem with control valve (Spill Valve). Hopefully the valves are OK. The spill valve you will locate inside...generally always you see wires coming out of it. Spill Valves are rarely serviced...myself I change with a new one. This what I am explaining is for nearly all models.....but I do not know your type of model....so I appologize if I am not explaining for your model. Well if you know how to open the cover...you can pin point what I said. Many Karcher covers are opened with screw drivers Torx T15.
We never release the pressure upon changing a fuel filter. The relay operates only with the key set to the on position. Open the hood and locate the fuel rail to the throttle body. The rail has a fitting with a valve alike the valve on a wheel. Unscrew the cap and press in the valve to release the pressure if you wish. I never heard of anyone doing this although you will need to clean any spillage on the motor before you start the engine. I would just remove the olf filter and let the pressure run out. It is safer this way for you and the vehicle. Use a coffee can to catch the spillage which will be very minimal
There is a valve called the spill-valve. It is often called the control valve. This valve activates the micro-switch. When the gun is released, pressure builds up and compresses this spill valve. At the same time it puts off the micro-switch. This will then stop the machine. Now when the spill valve is faulty it cannot hold compreesion under pressure so it starts de-compressing and starts the machine again. This goes on in a cycle as you explained. So you have to change the spill valve. If the spill valve that operates the micro-switch is part of the upper head,...then the whole head must be renewed. Myself I rarely service Spill Valves. The best thing is to renew it. From your explanation it seems that you did not take notice of this Spill-Valve. Infact when you mentioned Pressure Switch, I do not know if you are refering to the spill valve. If you are....then saying that the Pressure Switch moves and operates freely, does not mean that it is OK.
In certain machines in the outlet...there is a small valve, coloured black and red or green and yellow. This sometimes when faulty, it gives the fault you mentioned. Sometimes an inlet valve gives the fault you mentioned. But from my expirience it is most of the time that the Spill-Valve is the fault.
One simple thing you can do, is to check for leaks. Check if hose at machine is leaking. Check gun if it is leaking. You can also check if water still comes out of lance nozzel. These leaks however so small, will cause the machine to surge.
Another reason is due to a faulty SPILL VALVE. This spill valve( often called CONTROL VALVE) will contract when the gun is closed. When it contracts under the enclosed pressure it will switch off the machine by means of a Micro Switch. Now if this Spill valve is faulty it will loose its compression under pressure and puts on the micro switch again. This can be seen once in a while or more frequent, as in your case. I sometimes do service Spill Valves, but mostly I replace them with a new one. I do not know the model number of your machine, but normally you have to open the cover and you should spot the spill valve on the head. Most probably you see a thick wire or a cap containing the micro swith. If you find the micro switch, you have found the spill valve. Sometimes it is a bit hard to pull out the spill valve. Myself, in various Karcher models I remove the spill valve by trying to feed water and put on a bit the machine. In this way the spill valve will be spitted out.
Another reason which makes your machine surge, is leakage from from the detergent inlet.
If you do not see no leakages at all....then for sure it is the SPILL VALVE.
If you cannot do this job yourself or you do not find spare parts...you can continue using the machine as it is...but before closing the gun...switch off the electricity. I only recommend this in an emergency. You do this so that you do not leave the machine surging. This surge will for sure damage the electric motor and the capacitor (assuming it is single phase).
Dear Tigger82 (also montaver2000),
This explaination is relavent to various Karcher models, especialy your model. When you are using the machine with the gun open....presurised water comes out of the lance. When you close the gun, the machine stops. This happens by means of a Spill Valve or often called the Control Valve. When the gun is closed, this spill valve cotracts with built up pressure and at the same time works on a miro switch which cuts the electricity....and thus stops the electric motor. Now in many cases when the gun is again opened, this spill valve sticks and keeps the electric circuit closed.
In all cases you must open the cover, and locate this spill valve. Sometimes it is easy to see a micro switch on it. If you remove the miro switch from the spill valve the motor will for sure turn.
Now the spill valve gets stuck for many reasons. One of the reasons is that you leave the machine under pressure for a long time and even store away the machine with pressure still in the system. A spill valve also gets stuck due to detergent. I sometimes service the spill valve and lubricate with special solicon grease. But the best way is to change the spill valve with a new one. So in a few words, the spill valve is stuck and leaving the microswitch off. So the electric motor cannot turn. One final hint is that sometimes the spill valve is difficult to remove. So all one has to do is attach water supply and switch on the pump. With the pressure produced the spill valve will be pushed out. In my oponion this job must be done by a person who knows what he is doing. Carefull that you have safety electrical breakers. See that you have safety shoes, safety gloves and eye protection.
The solution is very simple. All you have to do is change the spill valve.
This because the spill valve is not worth servicing. The actual problem is that the spill valve is leaking from its bottom-part seating. When you close the gun, the spill valve goes down, opens from the underside, and switches the electricity off. When you press the gun, the spill valve returns to normal, and if the underside does not close, you have low presure, because the water keeps circulating.
MG. (Karcher service engineer).
I had the same problem - good water inlet pressure, no output pressure, even though the lance and handle seemed to be clear and working find.
I found that the electrical switch wasn't being operated correctly by the spill valve and wasn't turning the motor on/off correctly.
Inside the plastic electrical box there is a small white device that presses against the micro switch assembly. Carefully adjust the allen screw perhaps 1/4 turn out or 1/4 turn in to obtain correct operation of the microswitch - you will hear the micro switch clicking in and out when re-assembled. I'm sure they must have a rig to check correct positioning of this screw in the factory!
Hope it helps - mine is working find now and saved me buying another!