The Craftmans Shop > New from Old

Steam Cleaner. Re-Birth of a Karcher MPDS

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aeromad11:
Thanks for the great pics and info on the Karcher MPDS! I recently picked up an LMDS which is very similar to the MPDS. I am having similar issues with the burner and ignitor.
 Due to congestion in the control panel, I am looking for a  user/parts/service manual to make troubleshooting easier. I did see the training pdf which was very helpful but doesn't quite answer all of my questions. One question I had was in reference to the knob on the flow /pressure safety block, I'm not quite sure what the function of the knob is. Possibly a lockout when pulled and a bypass when pushed? Do you by any chance have any manuals? If so, could you share or refer me to a source? Thanks in advance.

awemawson:
All the documentation that I have is attached to the first post in this thread, and I don’t think mine has the knob that you are referring to.

Can you please post a few detailed photos of your unit?


Thanks

aeromad11:
I will upload some pics later today. The safety block I was referring to is the same as the valve in your pic  "Water-Flow-Sensor-Housing.jpg". It has a pull-up position that latches, and a push-in position that is momentary.
   I spoke with Karcher and they are trying to get me technical 
manuals. Thanks

awemawson:
I recently wanted to bring the Karcher out of storage to steam off the considerable hard grease build up on my newly acquired JCB 3CX. I knew it needed a new battery but also that there was a pressure feedback issue from the HP side back to the feed water so it would need a bit of fettling.

After jumping through a whole load of hoops to extract the battery and fit a replacement (covered on the JCB thread here, post #82 https://www.madmodder.net/index.php/topic,13429.75.html) and coming then to the back feeding issue I realised that the pump needed a full strip down and rebuild.

First issue was access - all the bits are at floor level - solved by putting it on the forks of the JCB and raising to a convenient height.

I could then start removing bits to examine the water valves. It's a twin cylinder pump, each having an inlet and exhaust valve but with some complicated plumbing between them to form other functions.

The valve are a plain flat disks pressed onto raised seats by a weak spring, the seats appear to be stainless steel inserts pressed into the brass casting.


So lets start pulling it apart . . . .

awemawson:
Now looking at the valve seats it was obvious that they need some form of re-finishing. I went through several ideas - perhaps a custom HSS cutter hand driven - maybe a spigot of suitable size with silicon carbide paper glued on - maybe a standard 'spot face cutter' ?

All these ways of doing it would leave debris in the pump bore that would be pretty impossible to remove, so I discounted them all in favour of a total strip down so that proper cleaning could be applied as the final stage before re-assembly.

So today the strip down began. The construction really only allows the brass casting that comprises the bore and valves to be withdrawn leaving the pistons attached to the crank, crank case and electric clutch unit. Not sure how easy it's going to be to get the pistons back in those bores. No rings, just VERY precise fits, with packing glands to keep the water and grease inside.

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