On 01/05/2011 20:14, The Medway Handyman wrote:
On 01/05/2011 15:50, Rick Hughes wrote:
I have a KEW Hobby pressure washer ...... been great to date ... but
yesterday started surging.

This is significant enough to make it useless, almost equal cadence
between pressure & no pressure ... the outlet pressure gauge is also
reading nothing ... but that may be just a duff gauge.

Anybody any experience with pressure washers ?

Only about 30 years worth :-)

Made my living selling them for years.


No shortage of incoming mains (pressure or flow rate) even tried
different hoses & fittings to be 100% sure of that.

If I operate lance without unit being switched on ... water is jetting
out OK.
Plus when it 'surges' it does seem right pressure and flow at the peak
of each surge.

Penny to a pinch of poo its a partial blockage in the nozzle. Don't be
too forceful in trying to clear it, nozzles are fairly delicate. Blow it
backwards with an airline if you can.


OK, how about this for a theory . .

He says that water flows through ok at mains pressure with the pump not
running, so there isn't a conventional blockage in the pipework. He says
that two different nozzles behave the same, so it's unlikely that
they're *both* blocked.

I reckon that the lining of the pressure hose is de-laminating, and
cutting off the flow. Then the by-pass opens and releases the pressure,
the pressure hose recovers for a bit and lets through another pulse -
and then the whole thing repeats on a once per 4 second cycle.

Got to be something like that!
--
Cheers,
Roger
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