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650 Brute Pressure washer, wayer comes out of nossle for about 3 seconds with the correct pressure, then stops, after a few times wayer is warm from wand

I have a 650 Brute pressure washer. Engine runs fine, water supply to washer is correct, when I start up the wand (sprayer) it is at full strength for about 3 seconds then goes to a small stream. After a number of tries the water gets very warm. When I first started to use it today the black release value on the bottom was releasing warm water, now it doesn't seem to be releasing anything. I went to home depot and bought a new wand, nozzle, and the necessary fittings, thinking it was a clogged wand and nozzle. The hand trigger doesn't seem to to have any real movement to it. Very weak. I have trouble shot everything that I have read in different post except taking apart the pump. I would like to know more anout the Auto cool down system and the other other brass value on the other side of the pump. I tightened that up, I'm wondering if I could have an air lock. I did make a foolish mistake, the machine stayed out all winter covered, I have always brought it inside prior winters. It is only used a couple times each year. I also have not used the new spray gun I bought, If the gun isn't the problem then it can be returned I will break down the other and check for clogs. Any thoughts on what my problem could be. Did I freeze the values and the insides since it probably had water in it. What should I try next ? Not getting my Mother's Day work done.

Posted by Anonymous on

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  • Brute Master
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It is true the pump could have been damaged but equally the unloader valve might be stuck wide open. When the lance trigger is released and the high pressure flow stops one of two things would happen without the unloader valve - either the pressure would rise until something broke or burst or the motor would stall so to prevent this an unloader valve is fitted that opens at a preset pressure that is higher than the working pressure but lower than needed for something to break.

When the valve opens to prevent the pressure building to unsafe levels the "surplus" water is generally dumped into the pump intake so the same water is circulated to some extent and it is likely to become warm under those conditions.

An air leak into the pump intake will almost completely rob the output of both pressure and volume. There is often a facility provided where detergent can be added to the intake controlled by a simple valve which if left open with an empty detergent container will be an effective intake air leak.

In the old days all the pumps were made of bronze or bronze and cast iron but these days pumps and components are made of a variety of materials and now unless pressure washers are in continuous use corrosion can be a big problem.

I suggest you run the pump with the hose disconnected to ensure a good volume of water is being moved and if not work backwards...

Posted on Mar 02, 2017

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  • Brute Master
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Leaving it outside may have broken something inside as water freezes, it expands a lot. The wand is unlikely to be the problem. Your problem is indicative of a water supply problem. Some hose fittings has a non-return valve in the middle, and I have seen these foul the fitting on the power washer and cut off the flow. The pump is a simple centrifugal pump that spins very fast. This is why the water is getting warm because of friction. In normal circumstances, the water running through it cools all the parts.

Posted on Mar 02, 2017

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Ex-Cell VR2500 Builds Pressure but Won't Spray

I have a similar problem and diagnosed it to be a problem with the gun. I spoke to a technician that services this pressure washer and he walked me through all the diagnostic steps. The pump is working because there is pressure being built up and the gun sort of works because you can get water out before the washer is started. The technician said that the mechanism inside the gun is either clogged or broken. I am going to Home Depot or Lowes to purchase a new gun and will try it tonight. Guns are only about $30-40. He said generic is fine as long as the thread matches and PSI is in range. Good luck!

Posted on Aug 14, 2009

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