Question about Alfred Karcher K2400HH 5 Hp 2.5 Gpm @ 2400 Psi Gas Pressure Washer

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After removing the unloader valve and cleaning i

After removing the unloader valve and cleaning i coated it with plumbers grease. When i start the pump i get a pulsating pressure when i squeeze the handle on the wand. I tried a different unloader valvwe with the same results.

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  • Garry Clelland Jul 19, 2010

    Hi , there is a further 6 internal valves in the pump , if any of these have grit or dirt in them , that will cause rapid pulsation of the lance and low output pressure. its quite a fiddly job , but the main thing to watch for is damaging the valves ( nylon body/stainless seat)( i use a large easyout and a pair of external circlip pliers), replacement valves are cheap. remember to check and clean the inlet strainer( if it has one ). this is a link to a full parts breakdown , the valves are numbers 16 and 13 page 6 , drawing B2 parts drawing linkhttp://www.ultimatewasher.com/karcher/di...

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If you have pulsating usually you have at least one of the six check valves stuck open, so you're only running on two cylinders. You might have got some of your plumbers " grease" in the check valve. (Do you mean pipe dope?) three of the check valves shold be accessable from the outside of your pump but the other three are inside. You can get parts for your unit from www.pressure-washer-parts.com


After removing the unloader valve  and cleaning i - 911cc73.jpg

Posted on Jul 20, 2010

  • Eaglegeneral Aug 06, 2011

    I ordered the new unloader valve and installed it but still got pulsating spurts problem. I took the pump off and found that 1 of the 3 spring loaded push rods was stuck. I had to use a hammer and punch to free it out. I put it back in and it moved freely. I suspect it was caused by metal shavings so I replaced the oil with 10W30. I put it back together and it runs great now.

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1 Answer

My Honda pressure is stuck in low pressure mode. How can I get it into hogh pressure mode?


You should check your pressure washer without the hose on it to make sure the gun isn't clogged. If the unit still sprays at low pressure with the gun and hose removed then most likely your unloader valve is stuck open. You can lookup a parts breakdown for the pump on your unit and locate the unloader so you can remove it and clean and lightly coat it with silicone grease. Then a dozen quick load/unload cycles should help properly seat the unloader parts.

Oh...and if the unit does make full pressure with the gun and hose removed you should take the hose off the gun and see if there are any obstructions in it. Hard water, corrosion, stones....something needs to be cleared!

Take all safety precautions while handling your washer! Good luck!

Nov 17, 2011 | Honda Garden

1 Answer

MODEL 580768080 S# 5665189 POOR PRESSURE FROM WAND, WATER COMES OUT FINE BUT NO PRESSURE


Check the unloader valve. This valve is designed to open when you release the trigger so the pressure doesn't damage the pump. If it gets stuck the water will continue to by-pass around the pump and will not allow the water pressure to increase. This valve is usually located next to the hose connection pipe on the pump where you connect the hose for the gun. Remove and clean and lightly coat the valve with lithium grease. Let me know how you make out.

Jul 26, 2011 | Garden

1 Answer

Engine runs but only a steam of water comes out of gun with trigger on. washer is stored in a heated garage in winter.


you need to remove and clean the unloader valve. The way this valve works is when you release the trigger the pressure is diverted around the pump through the inlet side so you don't cause damage to the pump. This valve is usually located next to the discharge pipe on the pump where your pressure hose hooks up to. Remove and clean. Be sure to clean port that you remove the valve from also. Use carburetor cleaner. Lubricate the valve with a light coat of lithium grease. This should cure the problem. If not let me know.

Jul 25, 2011 | Briggs Stratton 020273 Elite Series...

1 Answer

Engine runs, but stopped pushing water


First I would start with the simple solutions.1. Check to see if your water pressure is good. 2. Check the pressure hose and tip for ubstructions. 3. Check the inet strainer and make sure you have no leaks. 4. Check the unloader valve which is located usually in the area of the pipe for your pressure hose connection. Remove and clean valve and port the valve sits in and lube with white lithium grease light coating. Try machine, if this doesn't work remove pump and inspect all the check valves and pump body for build up of gunk. If you find this you can clean with carburetor cleaner or you may have to purchase a rebuild kit. If you have problems finding the unloader valve go to jackssmallenginerepair.com and do a parts look up and you will see where this valve is. You can also purchase the rebuild kit on this site. Hope this helps.

Jul 24, 2011 | Karcher 2500 PSI Pressure Washer

1 Answer

There is water squirting out of a hole next the pressure hose connection. Is there a missing screw? Or an adjustment to the washer that can be made. There is no pressure because of this leak.


If this hole has threads then it might be the soap inlet. If water is shooting out under pressure you may have an obstruction in the hose/handle. Try removing the hose and running the washer and see if the water flows out the connection. If the hose ends up being the problem a visual inspection and cleaning of all inlets and the handle should clear it.

If the water coming out of the hole is low/tap line pressure then I think your bypass *(or unloader) valve is stuck in the bypass position.

A stuck unloader just needs to be unstuck and lightly cleaned. A light coating of silicon grease wouldnt hurt either!

Get the manual for this pump and see how to open/remove the unloader valve.


Jun 04, 2011 | Northstar Pressure Washer 3000 PSI

1 Answer

I have a honda power washer and it will run for about 30 minutes and then start losing pressure,gaining pressure back and losing for about a minute until dying, if i let cool off it will be good for...


Since you did not include a model number.. I have to speak in generic terms. On the output side of the pump there is a high pressure / unloader / bypass valve. There is probably corrosion on the stem of the unloader and the corrosion is causing the stem to stick in the brass stem guide. Remove the unloader valve assy from the output side of the pump. Clean off the corrosion with some scotch brite and the GREASE the stem. (Make sure the input water supply hose is connected but NOT on.) Dump about 2 oz of engine oil into the hole where you removed the unloader valve. Place a liberal amount of grease in the hole where the unloader was then install the unloader valve.

Start the unit but do NOT turn on the water for about 1 minute. Squeeze the power wand knowing full well your going to get oil and grease out of the end of the nozzle for about 45 seconds. Begin cycling the wand trigger rapidly.... multiple times. Your forcing the unloader valve to work.... Then try normal use.

I Not only work on these I have an Excell 2400 with the honda 5.5hp GX 160 engine that just this last weekend I had to do this exact procedure for the same reasons.... It is working like a champ again and it was new in 1997.

Thanks for choosing FixYa,
Kelly

Jun 03, 2011 | Garden

1 Answer

Runs good but presser drops soon after engage wand. gas unit.unloader valve apossible? 16 years oil .


Disassemble the water admittance valve and clean bore with a dowel and crocus cloth. Then replace O rings on the valve plunger. Lube lightly with plumber's grease and re-assemble.

Jan 04, 2011 | Northstar Garden

1 Answer

I have a Pressure Washer with a Comet ZWD 4040 Pump. It recently had a new Unloader Valve fitted. It has suddenly developed a problem, the pressure goes up to 3000psi and then drops back to 2000psi. I...


Derek, Hi and welcome to FixYa. I am Kelly.

I just now happened across your post and note it is 3 months old. Hopefully you already have the problem solved.

If not.. looking at the pump history of having the un-loader valve replaced it sure seems that the current un-loader valve is sticking. When an un-loader valve is removed the internal housing is sanded smooth and everything about the un-loader valve is coated with Lubriplate #105 White Grease. I get the feeling that who ever did the un-loader valve repair failed to sand / clean the housing and use White Grease for the final assembly.

You should remove the valve... Sand the housing and get some Lubriplate #105 white grease (auto parts store) in a tube. Lubricate it liberally and reassemble it. If should work fine after that.

Thanks for choosing FixYa,
Kelly

Sep 15, 2010 | Comet GXD2527G Pressure Washer Pump

1 Answer

REMOVE PUMP


Look for a black plastic cover with a silver snap on top; pry off the silver snap and lift off the plastic cover; next remove the two screws on the top plate then pull out the piston inside - if unable to lift out, start unit and watch it pop out - coat piston with lithium grease and reinstall.

The sticking pressure relief valve is somewhat common with the Karcher 2400HH series pressure washer, it is caused by hard water and lack of grease on the pressure relief valve. To remedy the problem, use silicone (plumbers) grease to lube the o-rings on the unloader valve part# 4591040 (karcher calls it a spill valve on the parts list) You can click on the link below for more help. A helpful note, if you store your pressure washer for long periods of time, than you should draw anti-freeze into the pump for storage... make a short 2' garden hose and connect it to the inlet of the pump, with a funnel stuffed into the end, poor anti-freeze into the hose and start the engine, this will draw the solution into the pump and protect it from corrosion and keep all internal parts lubricated (plus keep the pump from freezing).

Here is a link that might be useful: Pictures of the Karcher 2400HH Spill Valve


Dec 15, 2009 | Alfred Karcher K2400HH 5 Hp 2.5 Gpm @ 2400...

1 Answer

Once the trigger is released it won't starting spraying again.


I have the same problem. This is the responce for Karcher......

The unloader valve may be sticking, or is dirty. It probably needs to be cleaned and may need to be replaced, it is inexpensive. It gets a lot of use, but extends the life of the pump. The function of the unloader is to allow the machine to run in a bypass mode while the trigger of the gun is closed. First, a lack of high pressure can be caused by: 1. Insufficient water feeding to the unit, so check that the water is turned on all the way and that there are no kinks in the hose. 2. The inlet filter may be clogged. (it will need to be removed and thoroughly cleaned). 3. An internal water leak. 4.Also, low pressure can be caused by worn spray tips. If you have checked the first three with no resolution, the problem is internal and could be as simple as a sticking unloader valve. If you are mechanically inclined, you can clean this valve yourself and greasing the o-rings (use lithium based grease), or take it to a local service center. You do not need to take the pump apar
t. The unloader valve is located under the cover, and is secured with 2 bolts. (Use needle nose pliers to remove the valve) For those units with pressure and volume controls, the unloader is located under the pressure and volume control knobs themselves. Do not take any other bolts off or you will open the pump and lose the pump's oil.

Note: Lithium based grease will prevent future failure of the unloader valve.

Also, check websites such as fixya.com for tips and how-to info particularly on cleaning the unloader valve. Be sure to use lithium grease if you reassemble it.
I am going to check the manuel to see where it's at

Sep 24, 2009 | Karcher 2500 PSI Pressure Washer

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