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Leaking handgun karcher k785

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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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. !!

Posted on Feb 19, 2012

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Posted on Jan 02, 2017

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How to replace fuel pressure regulating valve


1991-94 Models - REMOVAL & INSTALLATION
  1. Remove the air intake tube and resonator assembly.
  2. Properly relieve the fuel system pressure.
  3. Remove the bolts from the fuel line clip.
  4. Using a 15 / 16 in. (24mm) backup wrench to prevent damage to the inlet port and bracket, disconnect the fuel inlet and return lines from the pressure regulator/fuel rail assembly.
If difficulty is encountered accessing the fuel return line nut, loosen and/or remove the fuel supply and rail attachment fasteners.
  1. Disengage the fuel pressure regulator vacuum hose.
zjlimited_1134.jpg

Fig. 6: Disengage the fuel pressure regulator vacuum hose

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Fig. 7: Use a suitable wrench to loosen ...

  1. Remove the regulator assembly attaching screw, then remove the regulator assembly. Plug the regulator port in the fuel rail with a clean rag to prevent system contamination.
zjlimited_1136.jpg

Fig. 8: ... and remove the mounting screw from the pressure regulator/fuel rail assembly

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Fig. 9: Remove the fuel pressure regulator assembly from the fuel rail
  1. Do not remove the O-ring from the retainer in the pressure regulator fuel outlet, unless it is damaged and requires replacing. Always remove and discard the O-ring from the fuel inlet.
To install:
  1. Lubricate the new fuel inlet O-ring and, if necessary, the new outlet O-ring with clean engine oil, then install the O-ring(s) in the pressure regulator assembly.
  2. Position the regulator assembly to the fuel rail. Coat the threads of the attaching bolt with Loctite® 242 or an equivalent threadlock, then install the bolt and tighten to 106 inch lbs. (12 Nm).
  3. Connect the fuel pressure regulator vacuum hose.
  4. Connect the fuel inlet and return lines, then tighten the lines to 133 inch lbs. (15 Nm) using a backup wrench to prevent port damage.
  5. Cycle the ignition switch to prime the fuel system, then start the engine and check for fuel leaks.
  6. Turn the ignition OFF and install the air intake tube and resonator assembly.

Hope this helps (remember to rate and comment this answer).

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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.

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Hello, i have a Crosman 760 Pumpmaster Air Rifle, i got it from my grandfathers basement and it does not hold air pressure, i dont know what year but its the old one with the brass bolt, not plastic. i...


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.

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Dear sdadean,
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.
Regards,
Fulltech.

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