On Tue, 12 Sep 2006 13:02:54 +0100, chris French wrote:

My Dad has a Karcher pressure washer - K550M, it's few years old now,
it's recently developed a fault.

Symptoms are that when turned on (with the water connected and turned
on), the pump 'pulses' on and off - with cycle time of say about 4
seconds - instead of staying turned off until you squeeze on the
trigger. It will sometimes pump water ok once the trigger is pulled,
sometimes it cycles on off. - I've fiddle about using a different jet
etc. Though that shouldn't make any difference anyway to the main
problem

I'm guessing it's something to do with the pressure/flow sensor (or
whatever it has) on the pump. Anyone know if there is anything I can
fiddle with before I have look at it.

I've had this two or three times with my rather ancient Kew pressure
washer[1]. Usually a small bit of grit or similar inside the pressure
lance, which after bit of fiddling and cursing about trying to rinse the
lance out from the nozzle end seems to clear itself. I did once get
problems with using a stop connector onto the hose coupling on the washer.
The pump was actually sucking water out of the hose and intermittently
closing the stop connector. I changed the connector for an ordinary one and
the problem was immediately solved.

[1] Bought, at a guess, about 25-30 years ago at a 'Special Show Price' at
the Ideal Home exhibition. When I pick it up now, I find myself wondering
how on earth I managed to lug it back on the train. :-)


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the dot wanderer at tesco dot net