Question about Karcher 2500 PSI Pressure Washer

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Karcher 2400 psi washer- no pressure

No pressure

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If the water is flowing
the valves need to change
if no water pistons in pump need to change.

Posted on Aug 01, 2009

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  • 384 Answers

Clean out the spray head with a small diameter wire.

Posted on Jul 22, 2009

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: Karcher 2400 psi blaster When you

To determine if your problem is due to an easily replaceable part, follow these steps:

1. Connect the water supply hose, the pressure hose, and the wand WITHOUT any nozzle tip.

2. Turn on the water supply, and press the trigger until water is smoothly running out of the nozzle
after any air is all purged out. Release the nozzle trigger.

3. Start the engine, and let it warm up for about 30 seconds.

4. With the engine running smoothly, press the nozzle trigger. The water should flow out of the nozzle (without the tip installed) at a faster rate, while the engine noticeably loads down as it used to do before your "no pressure" problem. If it does not load down, turn it OFF, and disconnect everything, and contact a Karcher repair facility.

5. If the engine does load down, release the trigger, and install one of the nozzle tips (not the black one).

6. Press the trigger, and the engine should load down, and you should have normal pressure from the wand. After you release the trigger and press it again, you will probably again have no pressure, and the engine will not load down. Removing the nozzle tip, pressing & releasing the trigger, and re-installing the tip should give you normal pressure again, but releasing the trigger will cause no pressure until you again remove the tip, press the trigger, and re-install the tip.

This is caused by a bad UNLOADER VALVE, which is located under a black cap with a metal button on it located on the top front of the pump. I don't know if you can purchase the replaceable parts from a Karcher repair shop, but when a neighbor & I took his washer to a repair place, it looked pretty simple to do this repair, and he was charged about $60 to replace a $5 (maybe) part, and it took about 5 minutes.

Posted on Sep 17, 2008

  • 92 Answers

SOURCE: trouble with Karcher Pressure washer

Dear Pgarciax,
It is important that you must have mentioned the model number of your Karcher. Just the same I can surely say that your machine's fault lies in the "SPILL VALVE"
When the gun is open and pressure is being produced, the spill valve is in a relaxed position. Also it has at the bottom a valve, which when pressure is produced it is closed. If this does not close due to dirt or corrosion, the pessure goes down. Now when you close the gun,pressure forces the spill valve down to close the electrical system. Now if the "o" rings of the spill valve are damaged, the machine will start going on and off while in stand-by. So if you know how to locate the Spill Valve, all one has to do is change it with a new one.
In some Karcher machines there are 2 spill valves. One regulates pressure and the other one is for switching off the machine when the gun is closed.
Low pressure could also be due to faulty suction or delivery valves. Most probably the suction valves.
But when saying that there are short interruptions while in stand by, I stick to the fact that the spill valve needs renewing.
Regards,
MG.

Posted on Nov 19, 2008

  • 3 Answers

SOURCE: need help getting to an cleaning stuck unloader

The cart body makes this process a little confining but it can be carried out without removing the pump from the motor.

Diagram courtesy of: pressureparts.gif


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  1. Refer to assembly 9 in the diagram. Remove the splash cup by working the push-on nut off the top of the cup.
  2. Remove two Torx fasteners (13) and twist the nylon valve retainer gently while pulling up to remove it. Be aware of the small parts under the retainer.
  3. The objective is to get the valve (12) out of the bore (A). Connect the hose and wand to the pump, make sure the wand valve is closed. Connect the water supply to the pump and turn on the water flow.
  4. Place a shop towel over the valve bore and with the throttle in the off position, pull the start cord briskly several times to see if enough pressure builds to pop the valve out of the bore. If not, set the throttle to low and start the engine. Unless the valve bore is really corroded, this should pop the valve out.
  5. If this process fails, you may have to unmount the pump and employ a more brutal approach that will likely require a new valve.
I have worked on my washer for the last 2-3 years to keep it going but I've opted to replace the pump this year. My replacement is an "AR RMV2G25D" (~$170) .

Posted on Jun 04, 2009

  • 12 Answers

SOURCE: I have a karcher 2400 psi pressure washer and it

the most comon problem with thease is a stuck bypass valve, this is the valve that alowes the water to bypass round the pump when the triger is closed, when they stick all of your pressure runs around the pump and not out of your nozzle,,
its located in the centre of the pump on the top, undo the 2 cap screws pull out valve greese and re fit

Posted on Jun 18, 2009

  • 1 Answer

SOURCE: Unloader Valve - Karcher Pressure Washer

where is the unloader valve locaed on a Briggs Stratton pressure washer?

Posted on Oct 03, 2009

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Karcher 2400 psi with honda motor started up big puff of white smoke from exaust it shut off noiw wont start whats going on


I have a john deere 3000psi pressure washer with similar problem. Running fine then a puff of smoke and it shut down. I checked the oil and found it full of water. Not only that but since I still had the water turned on, the water was flowing out of the dip stick tube. I'm trying to find a solution online and will pass any information on.

Nov 13, 2010 | Karcher 2500 PSI Pressure Washer

1 Answer

Karcher 2400 Psi Pressure Washer No gain of pressure


remove the hose from the machine. Check that water is flowing. and there is no corrosion reducing the opening. If that is OK then it is the internal seals and pressure vallve on the pressure unit Cost to have it fixed by Karcher is $200

Thanks for using FIXYA

Sep 26, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

New nozzle, plenty of water, but no pressure.


It is warrantied for 1 or 2 years. Low pressure could be due to the un-loader valve needing grease. If it is leaking it will not work properly. If it is stored somewhere cold during winter months the small parts inside will crack.

Sep 18, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

2400 psi pressure washer... what oil is used in the piston/bearing housing?


Hello cgreers:
I am assuming you are speaking of the pump pistons, not the motor.
10W30 oil is OK but you must be sure it is NON DETERGENT. Also be sure the reservoir is only 1/3 to 1/2 full.

Jun 24, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

Pressure washer that leaks oil through the air breather


Most likely your air filter is plugged or dirty, or the crank case vent valve needs to be cleaned.if it still does it check that the oil level is at the full mark, if overfilled it would cause the same problem.

Jun 22, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

Pressure is fine when first started ,if trigger released no Psi


Your uplift injector valve in the water pump is sticking. You need to remove this part. Lube the top o-ring only with a water proof grease. Reinstall this part. You will be up and running again.

You need to use needle nose vise grip tool to easily remove the valve. You need to grind down the vise grip tool to fit the opening where the valve is installed.

To prevent this problem from reoccuring use a pump guard additive.

Apr 05, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

Not enough pressure


Speed regulation on small engines is notriously fussy.
Check the linkage to the carburetor and look for a small, light spring.
If there are several holes for one end of it, you may have to try more than one to find the spring tension that lets the engine run steadier than it now does.
If not, then either replacing it or changing the length by shortening or lengthening it will probably be needed.

Aug 09, 2008 | Karcher 2500 PSI Pressure Washer

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