Karcher - Problem with Detergent Suction connection

[purplemoon]

I have a KB3030 model and somehow managed to disconnect the detergent suction hose.

The machine started passing water internally and when I opened up the casing and connected it to a water supply the water was pouring from the end of the connection that the detergent suction hose connects to.

Have I lost a part that fits on the end of the plastic hose when I pulled it off - e.g some sort of non return valve?

 

[jj4091]

There are exploded view diagrams of your model at this site if it helps http://www.buyspares.co.uk/karcher/...8311&model_ref=373072&illustration_ref=377050

 

[purplemoon]

Brilliant! The diagram really helped

Untitled

• purplemoon
• 19 Jun 2011
• 1

It appears that the plastic tube simply slips over the nipple.

What looks like a ball & spring assembly within the 'detergent fitting assembly' (#7 in diag.) is probably the culprit as it's likely to perform a non-return function I'd guess. I doubt if it's a failure of one of the o-rings as the water is passing at mains pressure as opposed to just 'leaking' out.

I note that a replacement detergent fitting assembly is no longer available for my model However, there may be an alternative that would suit.

My next problem is to remove the large metal cover assembly which encloses the fitting!

 

[purplemoon]

Update:

Before attempting to remove the metal plate which would give me access to the detergent ftg assembly I decided to experiment ...

• Power off + mains water on = water pours from detergent ftg nipple.

• Power off + mains pressure + pull trigger = water stops leaking from detergent ftg nipple and flows from gun.

• Power ON + mains water on = water pours from detergent ftg nipple, when trigger is pulled the leak stops but the pressure is the same as when power is off.

• Motor etc makes usual 'noises' but it's just not developing the higher pressure.

I also tried blocking the unwanted flow from the detergent ftg nipple before pulling the trigger but there was no difference.

Any thoughts?

 

[jj4091]

Do you have a seperate lance you can try, it sounds like it may be a problem with that (perhaps blocked or obstructed) as I always thought that the soap was sucked out by the water flow creating a vacuum rather than pumped out.