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Hi I only have my Karcher 4040 a while now and already having problems. The water is getting to the machine okay but then spilling out onto the ground before it reaches the lance, hence no power.

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The is a rubber washer in the piece that you screw the hose on to maybe the washer is cracked or flattened out. Try replacing the rubber washer. The washer is supposed to seal the hose connection to the machine.

Posted on Mar 27, 2011

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1 Answer

Spill valve


spill valve is probably the valve that releases excess pressure or heat caused by not using trigger while machine is running. allowing the water the escape onto the floor

Apr 19, 2014 | Karcher 2500 PSI Pressure Washer

1 Answer

Washer doesn't reach enought output pressure. motor starts and stops at rendom.


First you have to do is try the machine without load. Attach everything as usual but do not attach the lance. Put on machine with water supply already on. If you close the gun the machine should stop. If you open the gun ( always with out lance)....the machine should start sending the water a bit far. If this is OK....then you have a lnance with a faulty, blocked NOZZEL.
NOrmally the machine stops when gun is released because there is a valve (Spill Valve) that actuates a electrical micro switch. This in turn closes off te elecreic supply...stopping the machine.
If with out lance your problem is still there....then the spill valve is faulty. AS I first said you must be sure that the nozzel is OK, so that you can blame the Spill Valve.
I raely service Spill Valves (Control Valves). I change with a new one. When open the cover using a TORX T15 screw driver....you locate the spill valve where there are 2 wires coming out. Some machines have the spill valve incorporated with the head and the intake and delivery valves unit. This I advize to change with new parts. These all in one heads are very good because at one go you change the spill valve and the other valves in one go.
Therefore in a few words you either have a blocked nozzel...or you have the spill valve faulty.
Also the delivery valves could be blocked...thus creating pressure inside and activating the spill valve to close off the electricity. You can also try to start the machine without gun and hose attached...but always with water being fed. NEVER put on a power washer without water being fed. And never store a power Washwer withpressure in it.
Fulltech.

Apr 25, 2011 | Karcher K2.26 Electric Power Washer

1 Answer

K3.86 The motor will not start. It starts for a few secons than stops. Does not products any power Thanks Jim


Dear Sir,
Normally when one closes the gun the machine stops. So you may have a blockage problem that is shutting the machine off. You may try to diusconnect the gun so that you run the machine without load. But..ALWAYS...with water being fed. Never run a power washer without water being fed. Without gun and water fed normally....your machine should continue working. If so you can attach the gun without the lance. If it works, you have a blocked nozzle in the lance. If so try with a very thin needle to clear the nozzel. Do not make the nozzel's hole bigger with cleaning, because then you lose power. Now these machines stop automatically by means of a control valve (Spill Valve). The spill valve when the gun is closed, pressure is created and the spill valve in turn will move to close the electricity by means of a micro switch. Spill valves give a lot of trouble if machine is left with soap in it, or if the machine is stored with pressure in it. NEVER STORE A POWER WASHER WITH PRESSURE IN IT.....always when finished working disconnect electricity, disconnect water and finally press the gun to release pressure. Well as I already said start by putting on machine without load. Then add the gun without lance so that you see that when you close the gun the machine stops....and when you open the gun machine starts again. All this without lance attached. Also in cases like these the Spill Valve sometimes gets jammed in the cutting off electricity position. Spill valves only need to be serviced with good silicon grease....but in doubt change the spill valve. If you open the machine the spill valve is located where you see 2 wires coming out. You should have special tools to remove and service/change the spill valve. Well hope you have a small idea from where to start.

Apr 19, 2011 | Karcher Garden

1 Answer

Karcher g2500vh..sheared off spill valve


I've seen that before many times. If you have removed all the broken parts you can purchace a new spill valve, grease it and install it. If not, you need to remove the pump and sit it brass side up before removing the bolts holding the brass to the aluminum part (you have to do it that way so the oil doesn't spill out. CAUTION: there is some spring tension on the brass head.), find the other pieces of the spill valve, then put it back together. Then you can buy a new spill valve and install it. there are several on-line companys that sell spill valves for karcher machines, but most of then you would need to call to get the part number and price. I'll help you out by giving you the part number.

Part #4.591-040.0

If this helped please rate it.

Bill

Jan 22, 2010 | Karcher 2500 PSI Pressure Washer

1 Answer

Karcher 550m has lost alot of its pressure,Why ,it keeps running when turned on, without pulling the trigger


Dear emmettbrickw,
Many of the models of Karcher machines, have a valve that under pressure...will compress and at the same time it will let water by-pass and circulating inside the head. As this valve compresses it also puts off a micro switch. This all happens when the gun is closed. This valve is called a SPILL VALVE or sometimes a CONTROL VALVE. Now for various reasons (example you store the machine with pressure in the system)....the seals of this Spill Valve get damaged. So you can have a problem in which the machine stays off....or a problem like yours...the machine continues running with gun closed. Your problem with gun closed...the spill Valve is not compressing and therefore not stoping the machine. At first when this happened it caused a fault also in your machine's valves. The gun was closed...pressure grew high...and this burst the intake valves for sure.
So my advice is that the spill valve must be renewed and also the intake valves. You must also check the Miro-Switch to see if it got stuck in the on position. If micro-switch is faulty, this also must be renewed. The Spill Valve is often located where you find a micro-switch holder with an electrical wire coming out. When you find this micro-switch...detach it from machine...then put on machine for a few minutes and press micro switch to see if machine stops. If machine stops...then at least Miro-Switch is OK. Always do these tests with electrical protective clothing, Shoes and Gloves!! Now if your machine does not have a micro-switch...then you have a spill valve which only by-passes water. This type of spill valve also needs checking and if need be renewed.
In a few simple words, the spill valve does all the work after one has opened or closed the gun. Sometimes by changing the spill valve only....the pressure will get back to normal. If not ...suction and delivery valves must be checked.
Regards,
Fulltech.

Jul 21, 2009 | Karcher Garden

2 Answers

Electric Karcher pressure washer surging when turned on


Dear firenutt681,
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).
Regards,
Fulltech.

May 30, 2009 | Karcher K2.26 Electric Power Washer

2 Answers

Karcher 211 - no motor action


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.
Regards,
Fulltech.

Apr 29, 2009 | Karcher K2.26 Electric Power Washer

2 Answers

Trouble with Karcher Pressure washer


Dear Pgarciax,
It is important that you must have mentioned the model number of your Karcher. Just the same I can surely say that your machine's fault lies in the "SPILL VALVE"
When the gun is open and pressure is being produced, the spill valve is in a relaxed position. Also it has at the bottom a valve, which when pressure is produced it is closed. If this does not close due to dirt or corrosion, the pessure goes down. Now when you close the gun,pressure forces the spill valve down to close the electrical system. Now if the "o" rings of the spill valve are damaged, the machine will start going on and off while in stand-by. So if you know how to locate the Spill Valve, all one has to do is change it with a new one.
In some Karcher machines there are 2 spill valves. One regulates pressure and the other one is for switching off the machine when the gun is closed.
Low pressure could also be due to faulty suction or delivery valves. Most probably the suction valves.
But when saying that there are short interruptions while in stand by, I stick to the fact that the spill valve needs renewing.
Regards,
MG.

Nov 09, 2008 | Karcher 2500 PSI Pressure Washer

2 Answers

Karcher washer went dead


Dear jimbocom,
The problem is that the spill valve got stuck. When the machine is working and the gun is closed, a valve( spill valve) moves with the accumilated pressure and switches the machine off. So what happened is that when the spill valve did its job, it found no water...and remained stuck. This leaving the machine in an off position. Service and lubrication to the spill valve must be done or completely replacing with a new spill valve. In my opinion you have no serious damage, but this job must be carried out by an expirienced technician.
Regards,
MG.

Oct 17, 2008 | Karcher K2.26 Electric Power Washer

1 Answer

Karcher 520M wont operate at high pressure


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.
Regards,
MG. (Karcher service engineer).

May 05, 2008 | Karcher 2500 PSI Pressure Washer

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