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Karcher jet washer not working correctly

Model 5.700. Power is coming through and making a noise buthe no preassure in the water coming out of the lance.

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  • Karcher Master
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Try this link:
https://www.youtube.com/watch?v=4WZgprLndhU

Posted on Mar 16, 2019

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5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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  • 92 Answers

SOURCE: Karcher pressure washer won't start

Dear ralph_birtwi,
Most pressure washers when their gun is released, the machine stops automaticaly. This is done ny means of a control valve. When the gun is closed...pressure is built and the control valve moves and switches a micro switch off. In your case the micro switch is still closed in off position. Now this happens if a machine is left and stored with pressure in it., This control valve could get jammed and leaving the micro switch in off position. It could also stay in off position by sticking, due to incorrect chemical.
So the control valve or even called spill valve, must be renewed.
Sometimes a little lubrication with the right type of silicon grease will get the control valve working again. This job is sometimes delicate and better done by a qualified technician.
Regards,
fulltech.

Posted on Apr 12, 2009

  • 92 Answers

SOURCE: I have an old kew pressure washer and when I pull

Dear dennis_partr,
In general all pressure washers have a control valve. This is sometimes refered to as the Spill Valve. When the trigger is pulled, the spill valve is in normal position. When the trigger is released, the spill valve compresses to let water circulate from its bottom part. If when the trigger is pulled and the bottom part of the spill valve does not close, then water keeps on circulating and hence no pressure. In this case change the spill valve with a new one. Also there could be a fault in the sucktion valves. If the sucktion vaves do not close, also water keeps on circulating. One also can examine the delivery valves. If these are not closing, then water is being sucked while delivering. Hence no pressure. Another cause but very rare, is that the swash plate that is pushing the pistons got loose. The electric motor will be turning, but the pistons stay in the same position.
I mentioned many causes, but usualy it is the spill valve. If with a new spill valve, there is still no pressure....then you must tackle the sucktion and then the delivery valves.
I wish to add that I assume that you have the correct lance and correct nozzel size. A worn out nozzel, will result in low prssure too.
Regards,
Fulltech.

Posted on Apr 22, 2009

aroostookb
  • 98 Answers

SOURCE: Karcher detergent draw problem

return it to Walmart

Posted on Jun 23, 2009

  • 1 Answer

SOURCE: Karcher dirtblaster does not oscerlate the water.

Stripped down the head of the dirt blaster by unscrewing the shaft from the end nozzle(it was quite tight). Removed the white disc from the nozzle using pliers and then cleaned out the 4 holes in the disc. Under the disc is an assembly which houses a ball bearing. I noticed that the ball bearing did not protude beyond the recess which houses it. I PUT TWO SMALL FIBRE WASHERS IN THE RECESS THEN REPLACED THE BALL BEARING. THEN REPLACED THE WHITE DICSC. Noting that the ball bearing protrude by approx 1/16th of an inch.
Re-assembled and the dirt blaster now works perfectly

Posted on Jun 20, 2013

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1 Answer

What is this problem - Karcher 3.86 electric pressure washer: humming noise, plug gets very hot, then unit shuts down?


Your pressure washer is either not fitted with a run/stop device in which case like mine you have to switch off within a few seconds of closing the trigger. Check your model features?
The humming noise is the motor stalled out against the pump because there is nowhere for the water to go. The shutoff is caused by the safety overload switching off after overheat.
Or, it has a pressure operated run/stop which is not working. Because water and electricity don't mix, I would suggest getting more specific help. You can download Karcher manuals /spares lists online from Karcher specialists but remember electricity is the silent killer.

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Dear Osville,
It is not clear what type of lance or nozzel you have. You said that the machine works fine with the circulating water jet(the turbo). So it seems the machine is fine. I do sometimes service variable nozzels and variable lances. But the best solution is to replace nozzels and variable nozzles and lances with new ones. Regarding the fan spray setting it could have no pressure because it might be in the chemical setting. The chemical setting lets out a fan shape flow of water, but with less pressure. The chemical system only works on low pressure in domestic washers, that is why it needs a low pressure flat spray. The pencil jet has 2 jets comming out because if it is a lance or nozzel with ball bearings, these ball bearings must have stuck in a wrong position. Also 2 jets can come out, due to a damaged nozzel hole.
Altogether, the best advice is to buy a new nozzel or lance...which ever your machine uses. All Karcher machines have their own specific nozzels, lances and high pressure hoses. You cannot change these from one model to another.
Regards,
Fulltech.

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1 Answer

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