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Karcher K3.86 doesn't seem to be able to sustain pressure. Keeps trying to pressurize then stops. Only keeps pressure while I spray. SOmestimes it totally shuts down, I guess when it overheats.

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Probably water flow check filter going into pump there is anut coming out on an angle going into the pump wire gause filter inside if this is clean follow it back to water supply symptoms definately indicate lack of water youdoit

Posted on Jul 26, 2009

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Posted on Jan 02, 2017

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1 Answer

Where can I get a Karcher 410 spray nozzle (bit on end of wand) Karcher don't seem to keep such an old part.


Hi Stephen:
Don't know where you are, but in my location here in Canada, the local LORDCO parts store has a large selection of pressure washer accessories.
I'd suggest that you try to find a similar equipment supply retailer.
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I have a Karcher G2600 OR, It sprays with full pressure for 1 secound and then it stops for about half a secound. it keeps repeating this constantly. I have checked the seals and the pressure valve and...


sounds like a bypass valveproblem try backing off your control valve and see if it clears up. also make sure your hose and nozzle are free from debree.

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Karcher k 3.99 does not pause correct


Is there a water leak from the bottom ?
Is so, then there maybe a small crack in the seam of the plastic manifold pump housing or one of the connecting fittings. A New Manifold Complete about $61.00. You may purchase direct from Karcher, and replace if you are mechanically inclined.
If under 1 year old, and you can find a receipt, Karcher will replace the whole Pressure washer under warranty.

May 09, 2010 | Karcher K 5.85 M Electric Pressure Washer

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Pulsating when idle


The motor doesn't pulsate when you are spraying and pulsattes when not spraying is normal otherwise the pressure will just keep building and burn out the pump. However, if you are not using the sprayer right away then the unit should be shut off until your ready to start again.
I hope the answer is helpful, please rate if the answer has helped in any way. Good Luck and have a great weekend.

Apr 03, 2010 | Karcher K 3.98 M Electric Pressure Washer

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Karcher pressure washer keeps pulsing when not in use and has lost pressure when in use


This can happen if the head of the pressure pump has split. You may need a new head, and to stop this happening again, tie the rigger open with a zippy tie. The water will run all time now and automatically bleed any air form the system. When you want pressure, turn it on at the main switch. This will prevent hydraulic hammer, (when you pull the rigge)r, which is what causes the head to split.

Mar 28, 2010 | Karcher Garden

1 Answer

Karcher k 3.99 does not pause correct


Is there a water leaking from the bottom ? If so then there maybe is a small crack in the Pump Plastic Manifold Housing. A New Manifold Complete Replacement is approx. $61.03 from Karcher, if you are mechanically inclined.
If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

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