Question about Karcher 2500 PSI Pressure Washer

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How to put oil back into the Karcher water pump

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You need to remove the pump and sit it brass side up before removing the bolts holding the brass to the aluminum part (you have to do it that way so the oil doesn't spill out.) CAUTION: there is some spring tension on the brass head.

Take the brass head off and set to the side on a rag or in a bucket. Dump out whatever oil is in the oil side, making sure not to drop the swash plate or bearing (the pieces sitting in the oil). Fill the oil end with aproximatly 4.5 ounces of Karcher pump oil, (or just 20w 50 weight non-detergent oil). Put the brass head back on and tighten bolts. Put the pump back on the machine.

If this helps please rate.


Bill

Posted on Jan 22, 2010

  • ExMgmtServ Sep 19, 2010

    GREAT info. Simple solution once you know how to do it. Thanks.

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Dear service Tech:What is the problem when you try to start motor in a pre-ssure washer and is it stucked?Guillermo,guillermoginrio@rocketmail.com

Posted on Feb 03, 2013

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Posted on Jan 02, 2017

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SOURCE: water in oil

Dear akwelectrica,
When a full kit was installed....WHAT was installed??? Were the OIl seals replaced?? Were the Low Pessure Seals Replaced?? Were the high Pressure Seals Replaced?? Was the OIL changed?? If the oil was changed...did all water in the oil compartment been removed?? Also did the suction and delivery valves were replaced?? Now if all these things were done, BUT the pistons were not changed, than the whole kit was done for nothing!! My suspicion is that the PISTONS were not changed. But if all the kit was used and even the PISTONS were changed, than you must for sure have a cracked or damaged head. When I say the HEAD...I am always refering to the part that holds the pistons. But in rare circumstances even the outer head could be damaged. Ask your "Service Tech" what he replaced and you will know the answear. As I said..I suspect that the PISTONS were not replaced by New Ones.
Regards,
fulltech.

Posted on Apr 12, 2009

  • 92 Answers

SOURCE: Can't fine where to put pump oil in

Dear glenoaks06,
I handled various Karcher washers, but the 2500 I never came across it. Just the same I will give you a few hints and maybe the solution for the problem. When the oil is milkey this means it has water in it. This means that there are faulty seals for sure. Now in many Power Washers the compartment where the oil is located is filled with oil prior to assembling the head unit that contains the pistons. So you have to take apart the the complete head change all seals( HP seals, LP seals and OIL seals). There are pumps that take multi-grade oil(15/50) and others 90 grade oil. If your pump is fan cooled, it probably takes 15/50 oil. Now one of the main biggest problem of water in oil is Faulty and Scratched PISTONS.
So when you have the pump apart....check condition of pistons. It is useless to change seals if pistons are damaged.
Now one thing regarding your problem, is that you have to put together the head with the pump upside down, so that you can fill the compartment (where the pistons are pushed by the swash plate), with OIL, before you put back the complete head with good pistons,springs,seals, valves...etc..etc. These few hints are relevant to quite a number of Karcher washers.
Regards,
Fulltech.

Posted on May 22, 2009

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Dear glenoaks06,
I handled various Karcher washers, but the 2500 I never came across it. Just the same I will give you a few hints and maybe the solution for the problem. When the oil is milkey this means it has water in it. This means that there are faulty seals for sure. Now in many Power Washers the compartment where the oil is located is filled with oil prior to assembling the head unit that contains the pistons. So you have to take apart the the complete head change all seals( HP seals, LP seals and OIL seals). There are pumps that take multi-grade oil(15/50) and others 90 grade oil. If your pump is fan cooled, it probably takes 15/50 oil. Now one of the main biggest problem of water in oil is Faulty and Scratched PISTONS.
So when you have the pump apart....check condition of pistons. It is useless to change seals if pistons are damaged.
Now one thing regarding your problem, is that you have to put together the head with the pump upside down, so that you can fill the compartment (where the pistons are pushed by the swash plate), with OIL, before you put back the complete head with good pistons,springs,seals, valves...etc..etc. These few hints are relevant to quite a number of Karcher washers.
Regards,
Fulltech.

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