I squeeze the trigger, I have pressure for 2-3 seconds and the engine dies.
I have removed the piston and spread white lithium grease all over it and put back together and that did not work. I am connected to a garden house and assume that I have a high enough volume of water running through the system. The pressure washer is about 8 months old and the previous owner used it one time about 6 month ago. I started it up 3 days ago and used it for about 20 minutes. The pressure was intermittent then at first but then was constant and was running fine. I ran out of gas. I put new gas into it a couple days later and have had this problem every since. I used regular gas instead of premium....could be part of the problem.
Re: I squeeze the trigger, I have pressure for 2-3...
Your pump is probably cavatating. when you first hook it up and turn hose on open thr trigger and let water run thru until it quits spitting and flows smooth. then crank it up and see if this gets it done. if not you could have a problem with the pressure valve bolted on the outside of pump. there should be a nut shaped stem to adjust pressure . turn it in and see what happens.
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Remove Items 122 (Un;loader) and 138 (Thermail relief). Clean them up as best you can with a nylon brush under some slow running water. Dis-assemble the unloader valve completly to clean (both ends). Then lubrcate them with White Grease and reinstall both parts AFTER placing White grease in the cavity the valves mount into. Very briefly... Test water flow with the engine not running Then start the unit with water off and let run 30 seconds. Turn off engine. Turn ON water supply and test water flow engine OFF. Note you will get a certain amount of white grease initially that passes through the unit. Start unit and rapidly actuate the trigger 1/2 second on 1/2 second off multiple times to force the unloader valve to cycle.
Since you did not include a model number.. I have to speak in generic terms. On the output side of the pump there is a high pressure / unloader / bypass valve. There is probably corrosion on the stem of the unloader and the corrosion is causing the stem to stick in the brass stem guide. Remove the unloader valve assy from the output side of the pump. Clean off the corrosion with some scotch brite and the GREASE the stem. (Make sure the input water supply hose is connected but NOT on.) Dump about 2 oz of engine oil into the hole where you removed the unloader valve. Place a liberal amount of grease in the hole where the unloader was then install the unloader valve.
Start the unit but do NOT turn on the water for about 1 minute. Squeeze the power wand knowing full well your going to get oil and grease out of the end of the nozzle for about 45 seconds. Begin cycling the wand trigger rapidly.... multiple times. Your forcing the unloader valve to work.... Then try normal use.
I Not only work on these I have an Excell 2400 with the honda 5.5hp GX 160 engine that just this last weekend I had to do this exact procedure for the same reasons.... It is working like a champ again and it was new in 1997.
Sounds like the unloader is cruddy with mineral deposits and sticking, if you pry off the silver cap, remove the
black cover, use an Allen wrench to remove the two "star" screws (or
you can remove the four engine mounts and remove the whole engine), lift
out the white plastic part with the brass needle & spring, finally
lift out the stainless steel piston or start up the engine
(make sure you have the water hooked up and running) and watch out for the
piston as it will shoot out ( placed a towel over the piston before starting
the engine). Then you can put white lithium grease all over the piston
I have the same problem. This is the responce for Karcher......
The unloader valve may be sticking, or is dirty. It probably needs to be cleaned and may need to be replaced, it is inexpensive. It gets a lot of use, but extends the life of the pump. The function of the unloader is to allow the machine to run in a bypass mode while the trigger of the gun is closed. First, a lack of high pressure can be caused by: 1. Insufficient water feeding to the unit, so check that the water is turned on all the way and that there are no kinks in the hose. 2. The inlet filter may be clogged. (it will need to be removed and thoroughly cleaned). 3. An internal water leak. 4.Also, low pressure can be caused by worn spray tips. If you have checked the first three with no resolution, the problem is internal and could be as simple as a sticking unloader valve. If you are mechanically inclined, you can clean this valve yourself and greasing the o-rings (use lithium based grease), or take it to a local service center. You do not need to take the pump apar t. The unloader valve is located under the cover, and is secured with 2 bolts. (Use needle nose pliers to remove the valve) For those units with pressure and volume controls, the unloader is located under the pressure and volume control knobs themselves. Do not take any other bolts off or you will open the pump and lose the pump's oil.
Note: Lithium based grease will prevent future failure of the unloader valve.
Also, check websites such as fixya.com for tips and how-to info particularly on cleaning the unloader valve. Be sure to use lithium grease if you reassemble it.
I am going to check the manuel to see where it's at
I am afraid that is how they work even electric ones wont start unless you squeeze the trigger ,once they are running you should be ablr to release the trigger , and then squeeze it again whilst running . if yours dies when you release the trgger while motor is running -----good chance you are working at too high pressure. but to start you have to release all the internal pressure