Question about Karcher 1750 psi Electric Pressure Washer
The last time I used my sprayer, it wouldn't spray at all, and the user
manual led me to believe that there was air in the pump. I followed
manufacturer's instructions, and now it's spraying. But, the motor and/or pump seems to be malfunctioning when the sprayer arm is not activated. It's a "rum - rum - rum" pulsing sound with "beats" about a second apart, rather than a steady hum of a motor. It draws down the electricity in my garage with each pulse--the lights dim. When I'm actually spraying, the motor seems to level out--and the lights are okay. I'll appreciate your advice. I'm a widow, and I can't afford to call a repairman every time I would have ordinarily turned to my dear husband. Thanks.
I had the same problem,and I replace the spare part set control head parts,Same problem when it goes hum hum,if you look inside it with a magnified glass you`ll be able to see hair crack line.
Posted on Mar 17, 2009
Replace the control head. Water leaks from the HP side,through the o-ring on the piston to LP side. This then triggers the machine to start since it's lost the 120bar pressure which is required to keep the machine off. If you can source the correct size of o-ring just change it out. If not use E-spares for the part which costs £12
Posted on Mar 16, 2009
Good morning to all
I am an Italian and working in a repair Karcher. After reading your post I can say with certainty that your problem is the breaking of a component of the pump called collector. The breaking of this component leads to a continuing power of the machine for 10 minutes and the loss of pressure during the operation. To repair should consult your local Karcher.
Posted on Dec 07, 2008
I think..(with all respect)...that the last time you used your sprayer, you swwitched it off and left it with pressure in the system. When one finishes using such machines, it is important that the pressure is released by pressing the gun. If these machines are stored with pressure still in the system, damage will be done to various parts, especially the spill valve. This is also more importantant for SAFETY reasons. The fault you have is most probably from the spill valve. In this case it should be changed with a new one. This job can only be carried out by a specialised technician. I wish to add, that this problem could also be caused by leakage. Check if the gun is leaking when it is closed. Also check if you see any water under the machine. This means the head is leaking. Very sorry but this problem requires a qualified technician or a person with expirience.
Posted on Nov 05, 2008
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Posted on Jan 02, 2017
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