My nearly-new Kaercher pressure washer has developed a problem... when
I use it with the 'normal' wand (as opposed to the twirly dirt-blaster
thingy), the motor/pump keeps cutting in and out so that I get a
pulsatile flow of about two blasts per second. (I have occasionally
seen this with the twirly wand as well).

What could be causing this? I wondered about a partial blockage in
the wand - would that cause these symptoms? It seems to work
perfectly well when the pump is in its 'on' phase, and I can't see
anything amiss. The water supply by hose is fine I'm sure - it's fed
from a direct mains-fed tap.

Any advice ?
Thanks
David

"David" wrote in message
om...
My nearly-new Kaercher pressure washer has developed a problem... when
I use it with the 'normal' wand (as opposed to the twirly dirt-blaster
thingy), the motor/pump keeps cutting in and out so that I get a
pulsatile flow of about two blasts per second. (I have occasionally
seen this with the twirly wand as well).

What could be causing this? I wondered about a partial blockage in
the wand - would that cause these symptoms? It seems to work
perfectly well when the pump is in its 'on' phase, and I can't see
anything amiss. The water supply by hose is fine I'm sure - it's fed
from a direct mains-fed tap.

Any advice ?
Thanks
David

Ours does this on 2 occaisions
a) when the inlet filter is blocked
b) when the nozzle is blocked where it joins the gun


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I wondered about a partial blockage in
the wand - would that cause these symptoms?

Yes, it does sound like that. If there is back pressure the pump detects it
and switches off, e.g. when you release the trigger.

Rob Graham

"David" wrote in message
om...
My nearly-new Kaercher pressure washer has developed a problem... when
I use it with the 'normal' wand (as opposed to the twirly dirt-blaster
thingy), the motor/pump keeps cutting in and out so that I get a
pulsatile flow of about two blasts per second. (I have occasionally
seen this with the twirly wand as well).

What could be causing this? I wondered about a partial blockage in
the wand - would that cause these symptoms? It seems to work
perfectly well when the pump is in its 'on' phase, and I can't see
anything amiss. The water supply by hose is fine I'm sure - it's fed
from a direct mains-fed tap.

Usually when this happens its because you have a small bit of grit in the
nozzle which is causing the pressure to rise past the relief valve setting.

Best way is to remove the lance from the trigger or nozzle from lance (if
possible) and clean it by applying water backwards through the nozzle. Or
use some bristles from a washing up brush. Don't use wire!

Tim..


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"Tim.." wrote in message ...
"David" wrote in message
om...
My nearly-new Kaercher pressure washer has developed a problem... when
I use it with the 'normal' wand (as opposed to the twirly dirt-blaster
thingy), the motor/pump keeps cutting in and out so that I get a
pulsatile flow of about two blasts per second. (I have occasionally
seen this with the twirly wand as well).

What could be causing this? I wondered about a partial blockage in
the wand - would that cause these symptoms? It seems to work
perfectly well when the pump is in its 'on' phase, and I can't see
anything amiss. The water supply by hose is fine I'm sure - it's fed
from a direct mains-fed tap.

Usually when this happens its because you have a small bit of grit in the
nozzle which is causing the pressure to rise past the relief valve setting.

Best way is to remove the lance from the trigger or nozzle from lance (if
possible) and clean it by applying water backwards through the nozzle. Or
use some bristles from a washing up brush. Don't use wire!


Thanks for the advice, all.
Have checked the inlet filter where the garden hose attaches -
perfectly clean.
Had a prod with some bristles as suggested, but have also discovered I
can actually look down the nozzle of the lance and see daylight right
through it, and so can confirm visually there are no blockages there.

So I'm a bit (a lot) puzzled. Any further ideas anyone?!

Could it be faulty machine? Its a recent enough purchase to be
returned to the supplier, but I don't want to do that unless it's a
genuine fault.

Might the fact that I occasionally experience the problem with the
twirly wand be explained by differential pressures in the two wands?

Thanks
David

"Tim.." wrote in message ...
"David" wrote in message
om...
My nearly-new Kaercher pressure washer has developed a problem... when
I use it with the 'normal' wand (as opposed to the twirly dirt-blaster
thingy), the motor/pump keeps cutting in and out so that I get a
pulsatile flow of about two blasts per second. (I have occasionally
seen this with the twirly wand as well).

What could be causing this? I wondered about a partial blockage in
the wand - would that cause these symptoms? It seems to work
perfectly well when the pump is in its 'on' phase, and I can't see
anything amiss. The water supply by hose is fine I'm sure - it's fed
from a direct mains-fed tap.

Usually when this happens its because you have a small bit of grit in the
nozzle which is causing the pressure to rise past the relief valve setting.

Best way is to remove the lance from the trigger or nozzle from lance (if
possible) and clean it by applying water backwards through the nozzle. Or
use some bristles from a washing up brush. Don't use wire!

PS...
Further to my post of an hour ago, the pressure pulsing problem is no
evident most of the time with my twirly lance as well. I feel a trip
to B&Q coming on!
David

(David) wrote:

Hello David

D| My nearly-new Kaercher pressure washer has developed a
D| problem... when I use it with the 'normal' wand (as opposed
D| to the twirly dirt-blaster thingy), the motor/pump keeps
D| cutting in and out so that I get a pulsatile flow of about
D| two blasts per second. (I have occasionally seen this with
D| the twirly wand as well).

Similar problems with a Sthil. Can often be fixed by raising the lance
right up in the air whilst activated.

--
Simon Avery, Dartmoor, UK
uk.d-i-y FAQ: http://www.diyfaq.org.uk/