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Where is the spill valve on 520m

No high pressure working only low pressure

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Posted on Jan 02, 2017

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SOURCE: karcher 520m spill valve jammed

Clean the spill valve!

Posted on Aug 20, 2008

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SOURCE: 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).

Posted on Nov 04, 2008

  • 420 Answers

SOURCE: Karcher G2600 VH - low water pressure

If the spill valve activates is "spills" water under the washer. There is a restriction or the pump has become inefficient and will not pump the volume and pressure it should at full RPM.

Posted on Jul 20, 2010

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Hope u can help when the karcher is conected up and the trigger on the handle is not depressed the machine makes a noise like its trying to presureise the hose it keep kicking in and out i have lost the...


The power washer stops when the gun is closed. This happens because pressure is exerted on a control valve (Spill Valve)...which in turn touches a micro switch and cuts electricity. Now most probably your machine is kickin in an out because the spill valve got faulty This happens when one stores away the machine with pressure still in it. NEVER store a power washer with pressure in it. The spill valve also gets faulty because left with soap and machine not rinsed. I rarely service spill valves...I change with a new one.
To locate the spill valve open cover (using a TORX T15screw driver)...and where you see 2 wires coming out...there is the spill valve.
Sometimes these machines have the spill valve incoporated with the head....in that case the whole head must be renewed. I also wish to tell you to try using the machine with out the lance. If all works good...then the on and off could also be comming from a faulty nozzel.
Regarding the Spill Valve...when it gets faulty...the machine also lose pressure. So in your case it is most likely that the spill valve is faulty.
Regards,
Fulltech.

Apr 14, 2011 | Karcher K2.26 Electric Power Washer

1 Answer

Karcher G2600 VH - low water pressure


If the spill valve activates is "spills" water under the washer. There is a restriction or the pump has become inefficient and will not pump the volume and pressure it should at full RPM.

Jul 20, 2010 | Karcher G 2000 MK 2000 PSI 20 GPM 87cc Gas...

1 Answer

Turn water on then actuate wand trigger. Pressure washer leaks when wand trigger is actuated and has very low pressure/flow output. After releasing trigger the pressure cycles on - off at approx 1 second...


You gave a very close solution yourself for the problem. But other leakages can cause such symtoms.Forexample a leaking head or a leaking chemical inlet. These can be caused because the spill valve (pressure control valve) is stuck. When this valve stucks it will leave a micro switch ON. So the machine keeps working with the gun closed. This will in turn creat internal pressure and damages the head, valves and chemical non-return and even damage outlet hose. So besides fixing the leakages you must check and service the spill valve. I often replace the spill valve. One must also checks if the micro switch is faulty. Now very important that what you mentioned that the machine cycles at one minute intervals, with trigger closed...this is most probably always the spill valve fault. If you open machine you see a place where there is a wire..this belongs to the micro switch...under you find the spill valve. Intake and suction valves may now also have a fault. Also there are systems with non-return valves at the machine outlet. You have to tackle by elimination. Fix the leakage..then tackle spill valve and micro switch.
Fulltech.

Jul 03, 2010 | Karcher PSI Electric Pressure Washer

1 Answer

Motor starts and stops continually


Dear loliver2,
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.
Regards,
Fulltech.

Jul 16, 2009 | Karcher K2.26 Electric Power Washer

2 Answers

I have a karcher K3.98 pressure washer. The unit surges when I put the wand on and then it stops working. I tried cleaning the wand (didn't make any difference) I then tried another wand from my son's unit...


Dear davedulmage,
To see if the unit is OK....first you must switch it on without water and without high pressure hose and gun. If machinr works smoothly, try by attaching a water supply. Now run the pump with water coming out of the outlet. If also in this case all runs smooth, then attach high pressre hose with gun but without lance. Put on the machine with gun open(to reduce initial resistance) and when you see a clear flow of water coming out...close the gun. The machine should stop. In this case I am suspecting that when you open again the gun the machine will not work. So it seems that when pressure is built in the pump a fault is occuring in the Spill Valve or also called Control Valve. When the gun is closed and pressure built up, this spill valve contracts and switches the pump off. When the gun is opened, the spill valve extends, putting the machine on and closing a valve at the base of the spill valve. So in your case it seems that the spill valve needs to be renewed. A spill valve gets stuck by incorrect using of the pump. For example leaving the pump with pressure in it for a long time. Also it gets stuck by detergents and chemicals. Sometimes I lubricate Spill Valves with high quality silicon grease....but it is much more practical to change it. When a new spill valve is put in....always run the pump with no load. This by usiing the gun without lance or wands, resulting in low pressure. If all OK...add a lance or wand that you are sure it is good. One final thing....to get to this spill valve you must put apart the body and expose the pump. If you are not that good at doing this job...it is better done by a more knowledgeable person. But changing the spill valve is worth it....because it is cheaper than a new machine.
Regards,
Fulltech.

May 19, 2009 | Karcher Garden

1 Answer

Pressure washer lacks pressure initially?


Dear allbusiness9,
This problem is most probably due to a faulty Spill Valve( also called Control Valve). When the gun is released the spill valve is compressed and it either closes a micro switch or just opens from the bottom and keeps the water circulating. All spill valves keep the water circulating from the bottom part. Now when the gun is pulled (opened)...the spill valve extends and closes the bottom part, and thus water goes out of the nozzel. When you work with no nozzel, there is enough water flow to close the bottom part of the spill valve. So when the nozzel is placed back there is no chance that the bottom part leaks water. When the gun is started with the nozzel....the bottom part of a FAULTY spill valve,..will colapse and pressure drops. So to fix the fault you must change the Spill Valve. In some occasions, I also found that suction valves give this problem. A faulty sucktion valve will colapse under high pressure, and lets water pass the other way round.
But in my opinion and experience, your problem is in the Spill Valve.
Regards,
Fulltech.

Apr 23, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

The pressure decreases when trying to wash


Dear rjrdiaz1013,
First you must find out where the real problem is. So first you must see that the engine works smoothly.(checking spark plug, spark plug gap, fuel mixture..etc..etc..). You have to do this by having no load at the pump. So remove water inlet hose and gun. If you manage to get the engine running smoothly,...then for sure you must service the pump. The pressure usually decreases from a faulty "Spill Valve". When the gun is closed the spill valve compresses and lets water circulate. When the gun is opened, the spill valve extends and closes an opening at its end. If this opening is not closing correctly, then the water keeps circulating and hence no pressure. My advice change the 'Spill Valve" by a new one. If the pressure is not 100%...then the next step change the suction valves. To change the suction valves, you must also change the high pressure and low pressure seals. Also better to change oil and oil seals. BUT the pistons must be examined. If the pistons have damage and cracks, these must be renewed, because they will ruin again the seals. In problems like these, I always fix the problem by changing the Spill Valve and the suction valves if need be.
When all necessary service is done, always try to start the machine with no load first. Also inportant that all seals and spill valve must be lubricated with the correct silicon grease.
Regards,
Fulltech.

Apr 21, 2009 | Psi Blue Max 2200 High Pressure Gas Power...

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

1 Answer

Karcher 520M Pressure washer won't operate at high pressure


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!

May 05, 2008 | Karcher 2500 PSI Pressure Washer

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