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Karcher G2650 OH - When I start engine pressure builds up and the engine will stop- When I pull the wand handle back - I get a high release of pressure - I can hold the wand open and start the engine and it will run until I close the wand - egnine stops
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If you are unable to shut off the pressure from the wand, there may be an issue with the unloader valve that is stopping it from switching into bypass mode when the trigger wand is released. The unloader valve is designed to respond to the spike in pressure created when the trigger wand is released, and to divert the flow of water coming from the pump to bypass the pressure hose and flow back into the intake end of the pump. If the unloader valve fails to switch into bypass mode, water may continue to flow out of the trigger wand. This may also cause damage to the wand. If you are unable to shut off the pressure from your power washer, stop the engine and discontinue use immediately. The unloader valve should be removed and possibly replaced if found to be malfunctioning. The inability to stop the flow of high-pressure water from the wand can be dangerous and should be fixed before continuing to use the machine.
Hi Cliff:
My experience is that the pump pressures prevent the engine from starting, so we hold the trigger while starting.
My brother has cut a wedge of wood that he uses to jam the trigger open to bypass the problem. It can get a bit wild if the wand is not secured when the unit is started..
Karcher Model G2650 OH with Honda 6.0 HP, GC 190 Engine. Engine won't start. New gas, has spark. Seems to flood instantly. Much gas in cylinder. Spark plug wet. Choke pulled out, power on. Oil OK. released pressure in line. Where can I down load a Honda Engine manual! Thank you !
The most likely issue, which seems to occur alot with karcher, is a cracked water pump. What happens is that as you release the trigger on the handle, the rise in pressure should cut off the motor, but as it also cuts off the water flow at the wand end and the motor spins a few more revs until it stops, then there is a huge pressure glitch which blows apart the weak plastic pumps that they use. Since the plastic cracks it is very difficult to repair and the only option is to go and buy another. BUT...this time tape up the trigger on the handle so it is always on and then it won't blow itself up. Just use the unit on/off switch to turn the motor on and off.
Hello,
Start the engine on your pressure cleaner then with your lance change it to low pressure as if you were applying detergent i think your model has the 5 different quickfit jets put the large derergent one in and give it a hit...
Then put the high pressure jet back in and see if it will build up pressure now, if this works then your bypass/unloader valve is sticking in the head it will need removing and cleaning up and lubricating...
This is the most common cause of not building up pressure and is usually caused by sitting around and not using the pressure cleaner regulary...
Hello awcockerill: This sounds like the bypass (unloader) valve is sticking. Here is a diagram of your machine's pump. On page 2.4 see part #1. The top of this assembly is a black plastic cover. Remove all of assembly # 1 carefully. Under that is part #8. This is the bypass valve. You need to pull this out, check that the o-rings are not bent, worn or damaged, then lube it good with a VERY VERY good waterproof grease. Re-assemble it and all should be well. The part numbers are on the diagram but where to get them depends on were you live. Karcher web site may give you a number to call. Good luck.
this is because the pressure is wound up too high ,if you back the pressure off abit you will solve the problem. if your machine has a pressure gauge ,you will be able to see the pressure needle"spike" when you release the trigger.that is the needle jumps right up high that is when motor stalls if you adjust the pressureso that the "spiking" effect is minimal your machine will not stall ,..I hope that helps
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