Have taken the handgun apart and there are 2 perished o rings where the pressure hose goes into the brass valve assembly. I am having difficulty finding the part numbers for these items to replace. Help.
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Re: Leaking handgun karcher k785
Hello sir, that is a on going problem with power washers the pump not working, than works sporadically. the main cause is leaving the pressure hose hooked up to the machine over a long period of time,not draining hose & machine, in the winter time the hose & pump will freeze causing hose & pump to expand and burst.handle to leak busting the o rings, build up of calcium deposits from hard water clogging up pump nozzle,valves in the gun handle,clogging hose fittings and screens.one of these has to be your problem.you can find a parts brake down at KARCHER.COM.orRJ BOWERS.COM . and manuals,these are good info,sites,hope this helps.thankyou. !!
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If you take the valve body on the pump apart very carefully you may found a broken return spring or a blown out rubber o-ring if the engine runs but the pump doesnt pump high pressure check your pressure relief valve sounds like its stuck open.
Sounds like it has a bad o-ring. you can take it apart and replace the o ring for under a dollar. just make sure you look at how it goes back together when you take it apart they are very simple. just make sure the carefully take the right side cover off with the left side of the rifle laying on a table, everything should stay assembled this way so you can look at it. the part you are looking for is in the large chamber that the pump goes into. from the back (the side opposite the pump) remove the spring and the metal piece behind it, then use something the shove the big brass part out of the chamber and the o ring is on the big brass part . take the old o ring to a hardware store to get another one.
I am assuming that when you said "wand" you mean the "gun". Myself I rarely service guns. But there are types that are serviceable and others that are not. If the brass elbow had 2 stainless steel pins....then this is a gun that you must replace with a new one. And putting oil, is the worst enemy....because oil damages O rings. Now the high pressure hose is fitted inside the brass part by being sealed by a black O ring and a white backing flat O ring. I do not know if these that you saw. Now if the brass has only one pin coming out from the back, this type of gun can be serviceable. Look at the brass at the place where the lance is attached. If you see a hexagon hole, this is a plug that can be unscrewed with an allen key. Behind the plug there is a ceramic seating. Then you find the valve and a spring. If the steel valve and the ceramic seating are damaged, the whole gun must be replaced.
To tell you the truth I usually change the gun and fit a new one, when the machine keeps on going because the gun does not close. I find it the best and the most safe way of solving the problem.
hi, this can be a problem with the hds745 machine, there are a few different versions on the market.
you first need to put a piece of pipe direct to the pump and bypass the chem valve and filter.
if still no look then you will need to have a look at the brass soap hose tail and see if it has a ball bearing in and if its stuck.
some model have a valve in the head when you have taken the brass soap hose tail out.
depending on amount of use i have found failures of the piston spring and retainer which are located inside main housing of pump,these cause pulsing and no pressure,you need to remove pump head and face plate to get to them,hope this is of help