Question about Honda Karcher G2400HH-R Pressure Washer

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I have cleaned and greased the spill valve on my 2400HH multiple times. I replaced the O rings on it and replaced the wand. High pressure mode still rare. If I start the engine, remove the nozzle on the end, and pull the trigger, I get pressure. I replace the nozzle and sometimes, rarely, I get a normal pressure. Very frustrating. Wrong size O ring replacements??? I used O rings I bought from pressure parts that came 5 to a card. I assume all O rings in that part of the pump are the same size. I read that many people with a 2400 HH have this problem. What do you recommend?

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You purchased the wrong o-rings, the o-rings that you purchased are for the hose ends. Karcher doesn't offer the o-rings for this valve but do offer a replacement unloader valve. See attached link to read more about the revised valve or to purchase

Posted on Oct 25, 2010

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1 Answer

The pressure washer starts but no water will pass through. The model is RX2600.


Common problem. The water admitance valve is stuck in the bore. The valve lets in more water when pressure drops and when wand is closed the pressure builds and the incoming water is blocked. Remove the valve spool and clean the bore with crocus cloth on a dowel rod. Replace the O Rings and lube with plumber's grease and re-assemble. Often you can buy an O Ring kit for the unit. Deposits build up and stick the valve spool at the high pressure end. The valve is usually crossways to the shaft and right where the water input is connected.

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PRESSURE WASHER RUNNING BUT NO WATER COMES OUT WHEN YOU PULL THE TRIGGER??? IT WORKED FINE WHEN I FIRST STARTED IT. I THEN SHUT IT OFF TO MOVE IT. WHEN I STARTED IT BACK UP, IT STOPPED WORKING.


The water admittance valve is stuck. The spring loaded valve lets more water into the pump when the pressure drops when you trigger the wand. Take the valve apart, clean the bore with crocus cloth on a dowel rod. Replace the O Rings and lube with plumber's grease and reassemble. Good as new! The O rings get dry, deposits build up in the bore, and the spool valve sticks at the high pressure end so no further water comes in to be pumped. Half hour job, get an O Ring kit to refurbish.

May 31, 2011 | Garden

1 Answer

Does not put out pressured water


Rebuild the water admittance valve, sometimes called pressure relief and other names. The valve has a spring and when you trigger the wand reducing the pressure behind the valve spool reduces and the spool moves letting IN more water to be pumped. Disassemble the valve. Clean the bore with crocus cloth on dowel rod... deposits build up. Replace O Rings on the spool and lube with plumber's grease and re-assemble.. Good as new!

May 08, 2011 | Briggs & Stratton Garden

1 Answer

When i switch on the power of my karcher K2.38 power washer, the motor runs but there does not appear to be any increase in pressure, which means that it is ineffective when it comes to cleaning the patio/...


Hi and welcome to FixYa, I am Kelly/
First off, remove the water supply hose from the power washer and locate the in line filter. Most of them are a plastic screen stuffed into the plumbing just behind the hose washer. Others have a short stand off and the filter / screen may be where the stand off attaches to the pressure washer. Others units have in in line sump that usually has a blue or red cap that you remove to clean the sump. Find the filtering mechanism(s) and clean it.
After doing this... attach the water hose loose to the power washer and turn on the water supply hose. Wait for all of the air to purge from the water supply hose. Then tighten the water supply hose. After that... Squeeze the wand trigger until all the air purges out of the high pressure hose and you get a solid stream of water with the unit off. Once you get a solid stream of water with the unit off... power the unit up and see if the high pressure hose becomes rigid / charges with high pressure. Next.... cycle the wand trigger 1 second on... and then wait for the hose to charge again. Do this multiple times. What your doing is forcing the un-loader / relief valve to stroke in the pump. Until the un-loader valve stokes un-restricted; you will have pressure problems. Next after the hose is fully charged... cycle the wand trigger very rapidly until you get high pressure each time you cycle the wand trigger. At this point your done and can proceed with patio cleaning.

Should this NOT resolve your problem.... get as much water out if it as you possibly can and pour a few ounces of engine oil into the water inlet. (Easier said than done... but you have to get oil into the pump and then let it sit over night. once you have oil in the pump pull the recoil 2 times with the ignition off just to force oil through the pump)
The next day you go through the same routine as stated above. This brings about 80% of the stubborn ones back to life again. Should it still be fussy after doing all of the above... you will have to replace the unload-er valve. If you removed the un-loader valve for any reason... you must clean out the pump housing and lubricate it and the un-loader valve with white grease (<-Available at any automotive parts source) BEFORE reinserting either the old one or a replacement un-loader valve. If you attempt to use the old one with lubrication.. make sure to remove any debris from the springs and wipe the seals clean with a PAPER towel before lubrication.

Thanks for choosing FixYa,
Kelly

Apr 16, 2011 | Karcher K2.26 Electric Power Washer

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

Pump pumps pressure as it should but when I release the trigger on the wand it wants to keep pumping instead of going into bypass mode. Is there a simple fix or do I need to have it repaired or replaced?...


Dennis,
Your issue is going to be in the unloader valve, I don't have a breakdown of the pump that you have but if you take the pressure adjustment valve out of the pump you can easily fix the issue. Look for a piston, with o-rings that moves up and down, either on the shaft of the adjustment valve or down inside the cylinder of where you removed the adustment valve. Clean the piston and/or o-rings, lube them with a white lithum grease (product in a tube, not the spray can). Put the adjustment valve back together the way you removed it and it should work correctly after that.

Oct 19, 2010 | Comet GXD2527G Pressure Washer Pump

2 Answers

Let go of wand trigger pressure will not come back


spill valve is stuck and needs to be cleaned and greased common problem....also check all connections for blockage in line

Jul 21, 2010 | Karcher 2500 PSI Pressure Washer

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...

2 Answers

I have a karcher K3.98 pressure washer. The unit surges when I put the wand on and then it stops working. I tried cleaning the wand (didn't make any difference) I then tried another wand from my son's unit...


Dear davedulmage,
To see if the unit is OK....first you must switch it on without water and without high pressure hose and gun. If machinr works smoothly, try by attaching a water supply. Now run the pump with water coming out of the outlet. If also in this case all runs smooth, then attach high pressre hose with gun but without lance. Put on the machine with gun open(to reduce initial resistance) and when you see a clear flow of water coming out...close the gun. The machine should stop. In this case I am suspecting that when you open again the gun the machine will not work. So it seems that when pressure is built in the pump a fault is occuring in the Spill Valve or also called Control Valve. When the gun is closed and pressure built up, this spill valve contracts and switches the pump off. When the gun is opened, the spill valve extends, putting the machine on and closing a valve at the base of the spill valve. So in your case it seems that the spill valve needs to be renewed. A spill valve gets stuck by incorrect using of the pump. For example leaving the pump with pressure in it for a long time. Also it gets stuck by detergents and chemicals. Sometimes I lubricate Spill Valves with high quality silicon grease....but it is much more practical to change it. When a new spill valve is put in....always run the pump with no load. This by usiing the gun without lance or wands, resulting in low pressure. If all OK...add a lance or wand that you are sure it is good. One final thing....to get to this spill valve you must put apart the body and expose the pump. If you are not that good at doing this job...it is better done by a more knowledgeable person. But changing the spill valve is worth it....because it is cheaper than a new machine.
Regards,
Fulltech.

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4 Answers

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I had the same problem with my Karcher. The recall was lifted Aug. 0f 2007. Tried numerous people at Karcher....head of Customer Service, vice president, etc. No one returns telephone calls not even cutomer service....poor, very poor customer service. Thinking about calling Germany.

Jan 11, 2008 | Karcher 2500 PSI Pressure Washer

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