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Hozelock 7902 pulsates

When I switch on my pressure wash it pulsates to normal pressure then off about every second..any idea how to fix it?

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 242 Answers

SOURCE: pressure washer is pulsating when powered on

it just the presure building back up ,it will last years doing this,i would not worrie as replacing the presure pump will only be a temp fix and it will do it again ,most washes do this after a year or lots of use.

Posted on Dec 31, 2009

spraydoctor
  • 97 Answers

SOURCE: K5.140 low pressure and motor pulsates when trigger released

Trevor,

The pulsating of the motor that you observe is occurring because the unloader valve is "cycling", over and over and over. This happens when the unloader can not trap the pressure down-line from it. Whether you have an external leak or not, your unloader is leaking internally.

On home-owner class pressure washers, the unloader valve is not a completely separate part -- as they are on commercial pressure washers. Rather, the "body" of this part is molded right into the "manifold head" of the pump. So if you are looking at the pump, the unloader is where the pressure hose hooks up (The hose is not really hooking up to the pump, but is hooking up to the outlet of the unloader valve).

What you need is an "unloader rebuild kit". To get this, if I were you, I'd find a Karcher dealer, who will look it up making any necessary cross-references etc. and come up with a part number for the kit. This kit will contain all the wearable pieces that go inside the unloader.

Also inquire with said Karcher dealer about an exploded representation of the unloader so you can see where everything goes (and how it comes apart and goes together). If such a dealer tells you he/she has no such thing -- that is likely not true. It is, however, true that these dealers may feel justified in not wanting to be "tasked" too much because they earn very little $margin$ on the sell of these parts. At any rate, you need this parts explosion and if a dealer is not willing to get you hooked up with it, go somewhere else! Also, these service sheets may be available online, but I have not been able to locate them (admittedly, my search has been cursory).

When you do this, be sure to wash out every little piece -- because we know there is damage and bits a pieces of the old wearables may be inside cavities and this could/would cause things to not work upon completion. Do this work in a well lit area and be sure your vision is as good as it can be. I generally wear reading (magnifying) glasses to be certain I can see all detail.

Good luck and if this is helpful to you I hope you'll take a sec to rate me. Thanks!
Don

Posted on Mar 17, 2012

Testimonial: "A very full and technical solution. I have requested advice from a repair centre today and they are checking machine on Monday with a view to advising if it is financially worth repairing the unit. I will keep posted as to result."

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* Generated Frequency Signal of WATER LEVEL (WIL) SIW (KHz)

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I hope the answer is helpful, please rate if the answer has helped in any way. Good Luck and have a great weekend.

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Pressure washer is pulsating when powered on


it just the presure building back up ,it will last years doing this,i would not worrie as replacing the presure pump will only be a temp fix and it will do it again ,most washes do this after a year or lots of use.

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Karcher 360M pressure washer pulsating problem when idleing


Hello,


unfortunately these little units have this problem commonly, 9 times out of 10 it will be the plastic head or the plastic valve block on the unit will be cracked and leaking slightly... it builds up pressure then leaks out and tries to build up the pressure again and this just reoccurs over and over...

you can get this repaired but is normally about half the cost of a new unit, if the pressure is still okay i would probably recommend just keep using it until it proper dies...

If you do get this fixed, we have studied into this and believe the main cause of heads cracking is warm water say if your inlet hose is in the sun for a period of time this can cause the water to become quite hot or if the unit sits and water trapped inside the head assy freezes can also cause this. Hope this helps Kind Regards Brad

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If the pump seals have gone, you may get this effect too. Depends if the pump is being controlled wrongly, or just malfunctioning itself.

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