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I have a Karcher K4.97M electric waterblaster that has started behaving strangely. When it's powered on, but the trigger is not pulled, it continually cycles on and off (about a 2 second cycle - almost as if its building pressure but not holding it). With the case open, the valve that switches it off when pressure builds, is cycling up and down. When the trigger is pulled, the pump runs continually as expected, and seems to all work fine, but the output pressure is very low. It feels like its bleeding pressure internally somehow. I've pulled the valve assembly apart, but nothing obviously amiss (but then again, I'm still decoding exactly how it works!). Andrew
Hello Karcher user world, I have exact same symptoms as described by andrew142 above, with my 399M electric unit, but I am not sure if it has the “unloader valve” referred to. Can someone please describe where that component isHello Karcher user world,
I have exact same symptoms as described by andrew142 above, with my 399M electric unit, but I am not sure if it has the “unloader valve” referred to. Can someone please describe where that component is
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This sounds like it had water left in it and it froze over the winter. The motot turning on and off signals a water leak on the output side of the pump. You may have a cracked pump housing. Locate the pump and make sure nothing is leaking in that area when under pressure. looh for fine hairline cracks.
A couple of other options spring to mind. It may be an air-lock, try disconnecting the high pressure hose and letting the water flow under its own pressure for 5 mins or so. It may also be a crack in the cyliner head...£16 from Espares..takes about an hour to strip and refit. you will need allen keys (to remove the cylinder head) and torx type screwdrivers for the casing.
I also have a Masport 2000 electric waterblaster (with a MKA30 - 450 Comair motor capacitor). The unit just stopped working, and it would appear to have no power.
Can't tell if the capacitor is burn't out though as it looks and smells Ok!
Hi; It has an internal water leak or a seal or valve is leaking air. These machines are warrantied for 2 years and that is about all you can expect from them. Having it repaired professionally would cost about 75% the price of a new machine. If you are handy enough to get into it yourself, e-mail me and I will send you a diagram. ([email protected]) Part prices are expensive in Canada but not bad in the US. I don't know about other countries.
Diagram here It could be the Overpressure valve is leaking #20 It could be one of the small valves is not sealing #14 and #15 The soap valve could be not sealing #7 I have also seen micro cracks in the cylinder head #8 Good Luck
If you are sure it is not a bad o-ring and you have re-assembled it correctly then try this. Visit here: http://www.rjbowers.com/parts_manuals/partslist_1190343804.pdf Part # 8 in the pump, karcher # 9.001-187.0 includes a small bullet shaped valve. It could be leaking. It can be carefully disassembled and cleaned.
The machine has a pressure leak. Check for a cracked controll head or either a leaking outlet elbow. The machine will short cycle if the holding pressure can not be maintained
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