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Motor pulsates in rapid sucsession little pressure,with lance removed continuesto run normal,new lance same problem,my estimation is the valve at fault that controls the pressure switch

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  • Richard Perkins
    Richard Perkins May 11, 2010

    Hi there!



    Please state model so I can assist you. Is this a pressure washer with problems?

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  • Master
  • 1,036 Answers

It could be the pressure switch itself at fault. If it is reading (in error) too much pressure, it will shut off for a second and then pulse as you say.

If the pump seals have gone, you may get this effect too. Depends if the pump is being controlled wrongly, or just malfunctioning itself.

Posted on Jun 20, 2008

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1 Answer

Karcher K2.94 intermittent pumping and buzzing


try the machine with the lance removed from the gun.

buzzing is usually the noise made by the motor when it cant turn. if the pump start to pruduce pressure but the pressure builds up too high then the motor will stop turning... faulty lance or faulty spill valve (dump valve)

If you have a Karcher then you should always post your machines barcode.
The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

Aug 05, 2013 | Garden

1 Answer

Landa pressure washer LT 4035-4000 psi. Why is it losing pressure and continually pulsating?


If the pump is pulsating rapidly most likely valves are leaking or debris under valve keeping one or more from closing. If the pump pulsates slowly, comes up to pressure then low pressure then repeats, problem is pressure regulator /bypass. Or you could have a combination of both. Try lowering the pressure to lowest setting to see if slow pulsation stops. As parts age within pump and debris hinder operation you can no longer operate at full pressure. To make the pump last, use highest pressure as needed and everyday work using only 60 to 75 percent of capacity.

Mar 19, 2013 | Garden

1 Answer

When machine is just sitting when on, motor kicks in & out ( pulsating)


sounds normal. Unloader opens because pressure is too high. Pressure goes down and unloader closes. Pressure builds and the unloader opens again Leave it running like that and the water will heat up. If you have a thermo valve it will protect you a little. One of the fastest ways to destroy your pump is to let it run for long periods without using it.

Jan 12, 2013 | Karcher Garden

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

On high pressure it pulsates


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 electric supply...stopping the machine.
If with out lance your problem is still there....then the spill valve is faulty and the machine starts pulsating. AS I first said you must be sure that the nozzel is OK, so that you can blame the Spill Valve. When the spill valve is faulty the machine pulsates at high pressure.
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.
So I advice again to try the machine with out the lance. If when gun is closed machine stops and stays that way ..it means the spill valve is doing its job. If when putting back the lance and the pressure starts to pulsates...the lance nozzel is faulty and thus causing simptyms on the spill valve. Also try to use machine with a new lance...having a new nozzel.
Fulltech.

Feb 18, 2011 | Karcher K2.26 Electric Power Washer

2 Answers

I have a Kew Hobby 80. The output from the lance is not constant but pulsates.


Could be the input water pressure is not sufficient. There is a pressure valve inside the machine that will cut off the motor if input pressure is too low or non existent.

Try a different source for the water input.

Feb 22, 2010 | Karcher PSI Electric Pressure Washer

1 Answer

Pressure pulsating when pulling trigger


you have a restriction in the nozzle end of the lance. clean with paper clip.
if not you have some dirt in the pump head valves which need cleaning

Mar 22, 2009 | Garden

2 Answers

Pressure washer


Dear Davidpaulson,
There are many reasons why there is no pressure. The simplest one is try a new lance. The lance you say it is not blocked, but it could have a wider hole with wear and tear.
The second most possible reason is, faulty valves. The suction valves are the most that give low pressure when they are faulty. To check the suction valves, put on the machine in the normal way and as it is working, disconnect the water supply. Than check if air or water is blowing out from the inlet. This is not 100% but you can have a picture of the function of the suction valves.
On the other hand if you do this exercise with the outlet, after removing the gun, you can check for the delivery valves. If you feel suction at the outlet, than the delivery valves can be faulty.
If all is correct, than there must be a fault in the swash plate. This could become loose and so the pistons will stop moving. Also another fault could be broken springs.
Also if the machine is leaking, the high pressure and low pressure seals are damaged. This also lowers pressure.
Other faults are related to the famous spill valve. Also faults could be to internal water leakages, due to corrosion in heads. Finaly I like to add that a faulty electric motor, could also not deliver enough rotation and power, and this also reduces pressure. This could be rewinded or changed for a new one.
Regards,
MG.

Nov 03, 2008 | Briggs & Stratton Prosumer 20324 Gas...

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