Question about Karcher PSI Electric Pressure Washer

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I have a Kew Hobby pressure washer and need a new lance which attaches to the gun.

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Posted on Jan 02, 2017

  • 92 Answers

SOURCE: I have an old kew pressure washer and when I pull

Dear dennis_partr,
In general all pressure washers have a control valve. This is sometimes refered to as the Spill Valve. When the trigger is pulled, the spill valve is in normal position. When the trigger is released, the spill valve compresses to let water circulate from its bottom part. If when the trigger is pulled and the bottom part of the spill valve does not close, then water keeps on circulating and hence no pressure. In this case change the spill valve with a new one. Also there could be a fault in the sucktion valves. If the sucktion vaves do not close, also water keeps on circulating. One also can examine the delivery valves. If these are not closing, then water is being sucked while delivering. Hence no pressure. Another cause but very rare, is that the swash plate that is pushing the pistons got loose. The electric motor will be turning, but the pistons stay in the same position.
I mentioned many causes, but usualy it is the spill valve. If with a new spill valve, there is still no pressure....then you must tackle the sucktion and then the delivery valves.
I wish to add that I assume that you have the correct lance and correct nozzel size. A worn out nozzel, will result in low prssure too.
Regards,
Fulltech.

Posted on Apr 22, 2009

  • 569 Answers

SOURCE: I have a Kew Hobby 80. The output from the lance

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.

Posted on Feb 22, 2010

Testimonial: "I haven't had a chance to try the suggestion but it makes sense. Thank you."

  • 68 Answers

SOURCE: Water does not come out of the lance when I squeeze the trigger

HI it sounds like you may just have a blocked jet on the end of your lance. Please remove and clean.

Posted on Jun 10, 2010

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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.

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HI it sounds like you may just have a blocked jet on the end of your lance. Please remove and clean.

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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.

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