jpullen Posted September 15, 2007 Report Share Posted September 15, 2007 My Karcher power sprayer which before today only ran when the lance lever was depressed has now started 'pulsing' on and off. The power seems down as well. Anyone with ideas, before I introduce it to the bin? Ta Link to comment Share on other sites More sharing options...
TonyD Posted September 15, 2007 Report Share Posted September 15, 2007 Mine is doing this too, it sounds funny! I've no idea whats causing it - is it fecked? Link to comment Share on other sites More sharing options...
Paul Posted September 15, 2007 Report Share Posted September 15, 2007 chucked my K4.99 for the same reason, and it did not seem to have the power it once had. Having took it apart the mechanism for turning off the power is primative to say the least. a little linkeage moved by water pressure disengages the power. I tried to see if there was adjustment, but it didnt seem to make a difference where i set it. I also whipped off the pump/gearbox, and it looked like water was mixing with the grease, so a likely cause of the lack of pressure. bought a new one sub £80 so chucked it in the bin. Link to comment Share on other sites More sharing options...
maersk Posted September 15, 2007 Report Share Posted September 15, 2007 Ok you guys. send me your donations. the cylinder head is fcuked. My 530 did the same thng and for £15 it is as good as new. E-spares rules ok. The UPPER fitting will have developed a crack which allows pressure to leak from the output side to the input which causes the pulsing. Link to comment Share on other sites More sharing options...
jpullen Posted September 16, 2007 Author Report Share Posted September 16, 2007 Thanks Maersk, now if only I could work out how to take it apart! Link to comment Share on other sites More sharing options...
maersk Posted September 16, 2007 Report Share Posted September 16, 2007 You'll find it is quite straightforward. Mine was simple really, with three hex bolts holding the pump bits together. Link to comment Share on other sites More sharing options...
fingermouse Posted September 17, 2007 Report Share Posted September 17, 2007 my dads did this and had it fixed under warrenty, guy in the shop said they all do it with the plastic inners and the part to fix it is always on back order. He told him to buy a good one with brass internals Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 24, 2007 Report Share Posted September 24, 2007 Ihave same problem with my K4.99, Karcher suggested it may be an airlock, sticking valve. First easy step to fix disconnect lance hose from washer and just let water run freely for 5 mins (washer off), then re-connect lance hose and expell air, switch on and should be ok. How ever didn't fix my problem. I am in process of strip down but can't find anything wrong all valves and seals look ok, may replace cylinder head as genuine parts from esapres are not that exspensive. Any suggestion appreciated before I order. Tom Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 24, 2007 Report Share Posted September 24, 2007 [ QUOTE ] Ok you guys. send me your donations. the cylinder head is fcuked. My 530 did the same thng and for £15 it is as good as new. E-spares rules ok. The UPPER fitting will have developed a crack which allows pressure to leak from the output side to the input which causes the pulsing. [/ QUOTE ] Have you got a aprt no. for the upper fitting so I can check which part it is and inspect mine. Tom Link to comment Share on other sites More sharing options...
AvantSE Posted September 24, 2007 Report Share Posted September 24, 2007 Had 2 Karchers now, both having done this. They are bloody useless. Link to comment Share on other sites More sharing options...
maersk Posted September 24, 2007 Report Share Posted September 24, 2007 Oh no they are not.................... Your turn. Link to comment Share on other sites More sharing options...
maersk Posted September 24, 2007 Report Share Posted September 24, 2007 tomandjo2 go on espares and look up the part no for your particular model. Yoou need the 'upper' part ofthe cylinder head assembly. Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 25, 2007 Report Share Posted September 25, 2007 I have ordered the Cylinder head set (the 'traingular' assy that mounts onto the pistons) item no. 20 on a K4.99 diagram. Do you mean the part that the inlet and outlet elbows connect to? Tom Link to comment Share on other sites More sharing options...
Daz Posted September 25, 2007 Report Share Posted September 25, 2007 I had a similar issue a few years ago with a Kew pressure washer. One cause was a slightly blocked jet, so make sure that's clean and the other was down to the incoming water pressure. They way we were told to test it was to get the washer to suck water out of a bucket instead and see if it still did it. Link to comment Share on other sites More sharing options...
maersk Posted September 25, 2007 Report Share Posted September 25, 2007 Thats what I did at first. Try it, but I reckon you need - 25. spare parts set ES 38412 Still, you will get a brand new pump unit at the end, with new seals and valves, for not a lot of cash. Karcher part 90011040. Try CleanStuff.co.uk They have them but are two to three days in the post. I assume it came to bits ok? They are designed to go together (and come apart) very easily. If you are looking for the problem you will find a hairline vertical crack. This is why they recommend you rinse through with water if you use a detergent dispenser as the 'gent can attack and weaken the engineering 'plastic' used in this application. Good luck. Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 25, 2007 Report Share Posted September 25, 2007 Does No.25 spare parts set include orings for injector (no.32) Tom Link to comment Share on other sites More sharing options...
maersk Posted September 25, 2007 Report Share Posted September 25, 2007 Can't really remember but I think not. It just pushes out and is re-used on reassembly - no need to replace the o -rings. Use a baby squirt of washing liquid and water if you are worried about nipping anything but really it is not necessary. Thinking about this you definitely DON'T get the injector pipe but you DO get the pressure switch actuator gubbins. Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 25, 2007 Report Share Posted September 25, 2007 Doesn't really matter all orings etc are ok in fact I can't find anything wrong at all but obviously there must be. Everything was like new not even the slightest foriegn body. Thanks for advice anyway will keep you posted when (not if) it gets fixed. Tom Link to comment Share on other sites More sharing options...
maersk Posted September 25, 2007 Report Share Posted September 25, 2007 No foreign bodies in mine either BUT under a HUGE magnifying glass I eventually saw the hairline crack that was obviously opening under 150 bar pressure to allow the HP water out into the LP inlet. Go for it! Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 25, 2007 Report Share Posted September 25, 2007 In part no.25 main housing?? Wasn't caused by frost was it? Mine started about a month ago pulsed every 5mins then following weekend every 30secs then following weeking every second. So sounds like something got worse gradualy so think I'd better take a more detailed look. Tom Link to comment Share on other sites More sharing options...
maersk Posted September 25, 2007 Report Share Posted September 25, 2007 Deffo not frost, but the symptoms are IDENTICAL to what happened to mine. The crack initially looked like a fine pencil mark. Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 26, 2007 Report Share Posted September 26, 2007 Where was the crack exactly as i'm not leaking any water so assume must be internal between input and output. Was it in a molding line? Think I'll order the Spares kit (no.25) as well and fit that first, if that cures it I'll send the head set back. Thanks Tom Link to comment Share on other sites More sharing options...
maersk Posted September 26, 2007 Report Share Posted September 26, 2007 Yep, internal craack between LP feed and HP output. Not on mouding flash though. It is VERY fine. Fit the headset too and get a complete new pump! Link to comment Share on other sites More sharing options...
AvantSE Posted September 26, 2007 Report Share Posted September 26, 2007 [ QUOTE ] Oh no they are not.................... Your turn. [/ QUOTE ] OK then. Whatever you say, despite numerous posts on here saying the same - that the Karcher machines are 'kaputt', all with the same fault. Quality items Link to comment Share on other sites More sharing options...
tomandjo2 Posted September 26, 2007 Report Share Posted September 26, 2007 I have ordered spare parts set (no.25) 10 day lead time though so must be a 'popular' part. Will keep you posted if I get it fixed. Tom Link to comment Share on other sites More sharing options...
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