After removing the unloader valve and cleaning i coated it with plumbers grease. When i start the pump i get a pulsating pressure when i squeeze the handle on the wand. I tried a different unloader valvwe with the same results.
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Re: After removing the unloader valve and cleaning i
If you have pulsating usually you have at least one of the six check valves stuck open, so you're only running on two cylinders. You might have got some of your plumbers " grease" in the check valve. (Do you mean pipe dope?) three of the check valves shold be accessable from the outside of your pump but the other three are inside. You can get parts for your unit from www.pressure-washer-parts.com
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You should check your pressure washer without the hose on it to make sure the gun isn't clogged. If the unit still sprays at low pressure with the gun and hose removed then most likely your unloader valve is stuck open. You can lookup a parts breakdown for the pump on your unit and locate the unloader so you can remove it and clean and lightly coat it with silicone grease. Then a dozen quick load/unload cycles should help properly seat the unloader parts.
Oh...and if the unit does make full pressure with the gun and hose removed you should take the hose off the gun and see if there are any obstructions in it. Hard water, corrosion, stones....something needs to be cleared!
Take all safety precautions while handling your washer! Good luck!
Check the unloader valve. This valve is designed to open when you release the trigger so the pressure doesn't damage the pump. If it gets stuck the water will continue to by-pass around the pump and will not allow the water pressure to increase. This valve is usually located next to the hose connection pipe on the pump where you connect the hose for the gun. Remove and clean and lightly coat the valve with lithium grease. Let me know how you make out.
you need to remove and clean the unloader valve. The way this valve works is when you release the trigger the pressure is diverted around the pump through the inlet side so you don't cause damage to the pump. This valve is usually located next to the discharge pipe on the pump where your pressure hose hooks up to. Remove and clean. Be sure to clean port that you remove the valve from also. Use carburetor cleaner. Lubricate the valve with a light coat of lithium grease. This should cure the problem. If not let me know.
First I would start with the simple solutions.1. Check to see if your water pressure is good. 2. Check the pressure hose and tip for ubstructions. 3. Check the inet strainer and make sure you have no leaks. 4. Check the unloader valve which is located usually in the area of the pipe for your pressure hose connection. Remove and clean valve and port the valve sits in and lube with white lithium grease light coating. Try machine, if this doesn't work remove pump and inspect all the check valves and pump body for build up of gunk. If you find this you can clean with carburetor cleaner or you may have to purchase a rebuild kit. If you have problems finding the unloader valve go to jackssmallenginerepair.com and do a parts look up and you will see where this valve is. You can also purchase the rebuild kit on this site. Hope this helps.
If this hole has threads then it might be the soap inlet. If water is shooting out under pressure you may have an obstruction in the hose/handle. Try removing the hose and running the washer and see if the water flows out the connection. If the hose ends up being the problem a visual inspection and cleaning of all inlets and the handle should clear it.
If the water coming out of the hole is low/tap line pressure then I think your bypass *(or unloader) valve is stuck in the bypass position.
A stuck unloader just needs to be unstuck and lightly cleaned. A light coating of silicon grease wouldnt hurt either!
Get the manual for this pump and see how to open/remove the unloader valve.
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.
I just now happened across your post and note it is 3 months old. Hopefully you already have the problem solved.
If not.. looking at the pump history of having the un-loader valve replaced it sure seems that the current un-loader valve is sticking. When an un-loader valve is removed the internal housing is sanded smooth and everything about the un-loader valve is coated with Lubriplate #105 White Grease. I get the feeling that who ever did the un-loader valve repair failed to sand / clean the housing and use White Grease for the final assembly.
You should remove the valve... Sand the housing and get some Lubriplate #105 white grease (auto parts store) in a tube. Lubricate it liberally and reassemble it. If should work fine after that.
Look for a black plastic cover with a
silver snap on top; pry off the silver snap and lift off the plastic
cover; next remove the two screws on the top plate then pull out the
piston inside - if unable to lift out, start unit and watch it pop out
- coat piston with lithium grease and reinstall.
The sticking pressure relief valve is
somewhat common with the Karcher 2400HH series pressure washer, it is
caused by hard water and lack of grease on the pressure relief valve.
To remedy the problem, use silicone (plumbers) grease to lube the
o-rings on the unloader valve part# 4591040 (karcher calls it a spill
valve on the parts list) You can click on the link below for more help.
A helpful note, if you store your pressure washer for long periods of
time, than you should draw anti-freeze into the pump for storage...
make a short 2' garden hose and connect it to the inlet of the pump,
with a funnel stuffed into the end, poor anti-freeze into the hose and
start the engine, this will draw the solution into the pump and protect
it from corrosion and keep all internal parts lubricated (plus keep the
pump from freezing).
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