Question about Hozelock Garden
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
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
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!
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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If you select the Normal Cycle, twice during the cycleyou will hear the wash motor going on and off at amuch different cadence. The pump will pulse severaltimes, repeatedly turning on for less than a secondand off for 10 seconds. This allows it to drive soils off the filter and into the drain while using very littlewater. If, after selecting the Normal Cycle, you select either the Sanitize or Hi-Temp Wash options your dishwasher will understand that a stronger wash is needed and it will not use this pulsing routine
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