Unloader valve sticking

Hi again and thanks for your response. If the engine is coming under an extreme load the unloader valve is stuck in place. Since the unloader valve is on the bottom of the pump it stays wet all the time and when in not in use the metal parts of the valve corrode as will the brass parts of the pump housing.
The unloader valve is on page B of this link: (Item A)
http://www.ereplacementparts.com/troybilt-0203370-2550-psi-pressure-washer-parts-c-26780_27006_25694.html

The following steps are hard to perform without causing havoc with your engine due to tipping so, what I am recommending is that you do NOT tip the engine to perform the following procedure without any dis-assembly of your unit at this time:
- IF you have a very short garden hose like the one that would go to a hose reel or a washing machine hose. Use that hose for this procedure over night. Connect the short hose reel or washer hose to the water supply connection of the pump and also connect the high pressure hose to the pump. Pour about 5 oz of regular engine oil into the water supply hose and tie the hose so that it is elevated (to retain oil in pump) Keep the high pressure hose elevated also so that the hose does not drain oil the oil you just added from the pump. After a few minutes with the engine ign. OFF pull the engine through 2 times. Let is sit over night. (What your trying to do is lubricate the seals and hopefully loosen the grip of any internal corrosion in the unloader valve area.)
The next day... after no more than 24 hours. Connect the short hose to a real water supply and start your pressure washer. once started do VERY short bursts with the wand trigger (1sec bursts rapidly). Your trying to force the unloader valve move and cycle normally in the pump housing. REMEMBER you added 5 oz of oil yesterday to the water system so be careful where you spray the first bit of stuff coming out of the wand nozzle. Keep up this 1 sec burst cycle going for 2 to 3 minutes or if begins to work normally your done and it is time to tidy up. .

If this did not work.... (it does about 85% of the time)
- You will have to remove the unloader valve and clean it.
Once removed try to get as much stuff off of the spring and o-rings as possible.
- Also you will need to clean the pump housing where the unloader valve installs.
- INSPECT all of the o-rings for cuts and again carefully wipe them clean so as not to damage them.
- BEFORE you reinstall the unloader valve you will need to lubricate the pump housing and the unloader valve with "White Grease" (Auto parts stores have small tubes of #105 white grease) Don't be afraid to use liberal amounts of white grease.
- Re-install the valve and test
This should bring your pressure washer back to normal again.

Let me know how things went.
Kelly

Hello there.

If the washer is loosing pressure then it needs to be looked at under warranty, im not sure where the fault would be, but another expert may well know.

If you don't get any suggestions then i would take it back and ask for a replacement or repair.

Hope this helps.

If you only have line pressure you probably have a stuck open bypass or unloader valve.

the unloader is usually on the pump body and can be taken apart and cleaned and lightly greased with a little silicone grease to keep it limber.

I hope this helps!

http://www.excellpressurewasher.com/product_manuals.asp

Whar has happened is that your unloader / bypass valve is sticking. This is due to minor corrosion and having water in the unit over the winter. Most of the time they will sanp out it if you do the following:

Add 3 - 4 oz of oil into the water supply connection and briefly and I mean very briefly switch on the unit then right back off. Add more oil to the water supply connection and then let it sit overnight.

Then next day turn the unit on briefly and let it sit another 30 minutes. After this you connect all hoses making sure to purge the air our of the supply hose BEFORE you connect the to the unit. Then once you turn the unit on rapidly trim cycle the wand trigger. Your goal here is to cause a water hammer of the unloader / bypass valve to get the spring and cupped seal to move in the housing. Pause briefly and see if pressure builds then fan the wand trigger again. This can take a few minutes to get it to work but the routine of pausing waiting momentarily and rapidly tripping the wand trigger is what should get the unit going again.

If this does not work you will have to take the unit apart dis-assemble the unloader / bypass vavle on the output side of the pump and remove the corrosion on the spring and the housing.


Once your done cleaning up the bypass unloader valve before you put it back in the housing place a liberal amount of Lubriplate #105 White Grease on the spring and inside the housing on the mating surfaces. (#105 white grease is available at any Auto Parts store. It is in a 3 - 5 oz plastic tube)

Re-assemble the unloader / bypass valve an it should work like a champ.

Thanks for choosing FixYa.

Kelly

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

HI This is caused either by a partially blocked nozzle on the end of your lance or the unloader valve sticking inside the machine. You can clean your nozzle by inserting a pin etc inside the end to clean it out. If this doesn,t work then it is most likely the unloader sticking. You need to remove the yellow cover and remove the unloader valve assembly.This is the bit that goes in and out when pressing the trigger. Remove this section then grease and oil the unloader and re fit. This should cure your problem.

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

unloader valve sticking in the pump head. remove unloader valve/ pressure reducing valve as per parts manual.

It will probably be caked up in white crystal type deposits if its an aluminium pump head. clean off the deposits and inspect the 'o' rings. if 'o' rings ok , apply silicon grease and refit.

It could also be a partially blocked lance jet not allowing enough water to come out of the lance if it is a flow sensitive unloader valve.

Hello:
Here is a schematic. On page 2.1, part #1 is the unloader valve. You need to remove it and lube it with a very good waterproof grease. Also insure the O-rings are in good shape and the spring action is working.

Hi
The unloader valveis HERE
If you go to D-2 it is part numbers 8 to 13. If it is stuck it is not only important to free it up but also make sure no o-rings are damaged and lube it with a very good waterproof grease. Good luck.