Karcher Waterblaster

[Maha]

Mine now just pulsates.
What would cause this to happen....water pressure?

[mashman]

blocked water filter?

[Edbear]

Must... resist...

[ttnz]

blocked water filter?

x2

its not getting enough water, check the hose and then there's a little filter in side the machine were the hose connection screws on. just give it a good clean out

start with this and if its still doing it, then try cleaning out the nozzle part some times they spit out an O ring which starts blocking up the other end

if you still got problems they can be repaired but usually its a few hundred dollars to have them stripped down and sorted so unless its a high spec one not really worth doing

all the best

[Big Dave]

Turn tap on.

[John_H]

I think the surging in Karchers (very common problem) is caused by a valve somewhere. It happened to mine and I can't really remember, I do know it cost me about 200 bucks to get it fixed!

[Oakie]

Turn tap on.

That's what I had to do. Well turn the tap on more actually. The water going in was less than that being blasted out.

Good way to wash parts of the bike too as long as you dont get too close (and keep away from the electric bits)

[Fatt Max]

Mine now just pulsates.
What would cause this to happen....water pressure?

Mine stopped doing that the minute I stopped shagging it

[FJRider]

Waterblasters are just high pressure pumps ... with the outlet very small diameter. The system relys on a small O-ring on the "pump" outlet to keep the pressure up ... but the actual flow down. Quite high pressures are achieved at the nozzle. If the O-ring goes ... the achieved pressure can blow back past the pump. Then as pressure is released ... the O-ring seats and then starts to build pressure again.

And so the cycle continues ... Water going where it shouldn't is not good in an electrical item ...

As for repair ... the O-ring seat is cast plastic and forms (usually)the mounting and seating for the pressure pump. And usually is a major component in the waterblaster unit.

A component not usually replaceable ... (ie: not available for purchase)

But you CAN try ... good luck ...

[davebullet]

Karchers are shit. Ours did the same then packed up. Hardly used and well taken care of. Won't be buying another one of them.

[Blackshear]

the water going in was less than that being blasted out.

...... Science

[nadroj]

Take the wand & hp hose off then flush backwards. Any little debris in the tip can cause that problem. (over pressure releif valve pulsing)

[Wannabiker]

I believe some of the cheaper Karcher (and probably other brands too) have plastic pump bodies that are not designed to be re-buildable. The more expensive models have cast metal pump bodies that allow rebuilding.

Having said that...I would have a crack at pulling it down and seeing what could be repaired / replaced.

[FJRider]

I believe some of the cheaper Karcher (and probably other brands too) have plastic pump bodies that are not designed to be re-buildable. The more expensive models have cast metal pump bodies that allow rebuilding.

Having said that...I would have a crack at pulling it down and seeing what could be repaired / replaced.

I repaired one once ... a small worm drive hose clip fitted ... a couple of hours to fit ... its still working ...

[glegge]

Mine now just pulsates.
What would cause this to happen....water pressure?

Did you get this working?
if not, you can get parts for these water blasters. mine had a similar problem, a new pump body fixed it. I found it not to difficult to do the work myself.
it turned out to be a common fault with the plastic high pressure pump body. the new part is re-designed so as not to fail again.

There is a parts/service provider in wellington i can put you in touch with, or try looking for a local agent that stocks parts.

Oh yeah, with some smart googling, you'll find exploded diagrams of these pumps also.
cheers
Gavin