Karcher Pressure Washer Capacitor 6.661-158.0

Quality parts from a quality company can’t recommend enough, will buy again many thanks

Got my old karcher 720mx up and running in no time great stuff 👍

Hi, for anyone not particularly electrically minded, this capacitor was used to repair a Karcher pressure washer. A simple explanation is that if you feed an electrical current through a copper winding, you will just get a pulsating magnetic field. The pulses match the 50 cycles/second of the mains supply and you can hear them. To cause the motor to rotate, you need a capacitor. The capacitor is used to advance the cycle of current which is then fed into a second winding aligned across the path of the first winding. The two windings operate to create a rotating magnetic field which causes the motor rotor to rotate. I hope that made some sense. When the pressure washer just sat there making a buzzing noise, the problem could be the pump jamming. It could also be a problem with a winding or the capacitor. The capacitor on this pressure washer was removed and tested using a multimeter. It measured 0.46uF. The new replacement measure 39.86uF - which is near enough the required 40uF. A very easy repair in these times of climate emergency and a growing need to recycle, re-use, repair. It's a capacitor, it does what it should.

My pressure washer dates from around 2003. It is a top-of-the-range domestic model ( Load=2.8kW, 450 L/hour , Max 150 bar ). I had cleaned half of a large decking area so in constant use for ~ 45minutes. After a tea-break the motor would not start and would only make a loud buzzing noise. I immediately stopped using it. The motor start capacitor was found to have leaked extensively and, once replaced with this component, the motor started normally. I can't comment on the quality - It's a capacitor and it appears to work.

My Karcher K6.85M Pressure Washer suddenly failed to pressurise whilst in use although it remained electrically connected and water continued to flow (though not under pressure). When switched off/on, the motor did not make its usual hum leading me to ultimately diagnose a faulty capacitor. Unfortunately the exploded diagram was unable to clarify the replacement part, offering two choices. Following a little research I opted for the 40MF Capacitor which I ordered from Ransoms Spares. On disassembly I discovered that the failed component was in fact the 25MF version though as my research had indicated that the 40MF version was a good exchange it was fitted into the electrical switch box without issue and more importantly the Pressure Washer returned to life with the replacement fitted. I am advised that the larger value component is an entirely compatible replacement and so far I have not had any operational issues.