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smata67 06-04-2012 09:42 PM

Karcher Pressure Washer Leaks
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I have the K-270M, others are similar such as the 260M. The unit leaks when the wand is installed. It does not leak when it is not installed (no backpressure). It leaks at the location where the barbed hose connection is on the photo (just above the cast threaded end, black in color), not at the actual 5/8" black plastic hose inlet, where most usually do due to a cracked plastic hose connection. Well, I took the unit apart. My advice is that if you do this, keep the unit upright, as oil spilled out when the cast front end was taken off. My question is this. The cast section must be removed to see where the leak is, but it does not budge, why is this? Also, what is the qty and weight of the needed oil? I spilled about a 1/4 cup and will refill with a thin oil if I cannot determine what oil is proper.

smata67 06-05-2012 09:30 AM

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I've found the schematic and it appears that there is a spare parts set for the hose barb connection, part number 28838200. Is this a common mode of failure for these? I have found that the oil is 15W40 and quantity is 4.6oz, which seems about right, as about a 1/4 spilled out when I opened her up. Would that be a "non-detergent" oil or does it matter? Still can't figure out how to take the aluminum cage off, that would be needed to rebuild with the spare parts kit.

smata67 06-05-2012 09:31 AM

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Picture shows leakage location. There is a half moon opening in the black plastic tube in this area that the water appears to come from.

tuchodi 06-05-2012 09:50 AM

As far as the oil you must use a Non Detergent 30 Mineral Oil

smata67 06-05-2012 10:27 AM

The schematic for the K270M has engine oil part number 62880500, which appears to be a 15W40 non detergent oil.

tuchodi 06-05-2012 10:41 AM


Originally Posted by smata67 (Post 936762)
The schematic for the K270M has engine oil part number 62880500, which appears to be a 15W40 non detergent oil.

Yes I see that but I have worked on pressure washers for many years and we have found that a single weight oil works better and gives a longer pump life. If you live in an area that has lower temperatures then you can use a 20 weight. If you choose to use the 15w40 just make sure it is a non detergent.

CaptRandy 06-05-2012 04:56 PM

Do not see a pressure relief valve on your unit. Unloader?

smata67 06-08-2012 08:25 PM

Well, the only non detergent oil I can find is a 30W at the auto shop, so 30W it is!

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