How to use soap dispenser on Karcher K2.87 power washer

The wand has a high and low pressure setting. When it is set to high pressure, no soap will come out. This is the way it is designed to work.

Karcher pressure washers can only dispense soap when used at minimum pressure. Try low pressure wand.

Most people make the mistake of using a high pressure tip on their power washer while trying to get the soap dispenser to work. These tips are usually red, green, white or yellow and they cause too much back pressure at the dispenser for it to work. You need to use the soap tip, they're usually black, for the dispenser to work properly.

If you have not yet found a solution, then here are some steps to take.
1. The soap dispenser only works on low pressure!!!!!!! So you have to REMOVE the high pressure Sprayer so that all you use is the Trigger Gun without the Extender.
2. Pull out the thin Plastic Hose with the filter attached in the end, and insert into your container of detergent.
It will only splatter the detergent over the area you want to clean, so you will then need to REATTACH the SPRAYER into the hand gun to work with the soap to lather, clean and spray of till clean.
This seems to be the way the system works on this model......also known as K2.36M (AU) in Australia or (EU) in Europe on the Karcher.com.au site then Service then Manuals. or on the link below.
Hope this helps any of you who has misplaced their Owners Manual just like I did and had a great problem trying to find a link as Karcher doesn't recognize the Model No: as Winner 10 or 11.

Cheers, Luke

I have a SIMONIZ S2000 electric. I bought the unit about 8 weeks ago used it once. On the second use yesterday the unit didn't work as well, the pressure seemed only a bit better than hose pressure and soap did not dispense at any pressure. SO.... after much thought I turned the hose/tap pressure down so that I only got about 2-3 GPM instead of the typical 5-6GPM normally coming out of my hose....... it worked! Soap dispenses and spay is way better! It seems that if if the inlet hose pressure is high the pump doesn't work as well... go figure.

I have a SIMONIZ S2000 electric. I bought the unit about 8 weeks ago used it once. On the second use yesterday the unit didn't work as well, the pressure seemed only a bit better than hose pressure and soap did not dispense at any pressure. SO.... after much thought I turned the hose/tap pressure down so that I only got about 2-3 GPM instead of the typical 5-6GPM normally coming out of my hose....... it worked! Soap dispenses and spay is way better! It seems that if if the inlet hose pressure is high the pump doesn't work as well... go figure.

There are different tips, In order for the unit to siphon the soap you need to use the tip that is for detergent. Its basically a tip that does not produce a high pressure it's more or less a soaker. Unit won't siphon under pressure. I hope this answer your question please rate the answer if it was helpful. Good Luck and have a great day. Jeff

Sounds to me that you may have a blocked high pressure jet.

Are you twisting the nozzle to low pressure? This is the only way to get soap

Two nozzels came with your washer one has a cone shaped head, the other one is blunt, attach the blunt one to the trigger. You will notice on the barrel of the nozzel it says "mix" turn the indicator line to "mix" and it should work. This is a very low pressure setting and is used to "apply" the soap only. You cannot despense soap in the hight pressure mode.