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what can cause my pressure washer (580762200 ) not to build up any pressure ?

I have a 6.75 HP #580762200 pressure washer. It has no pressure. I took it apart to check for any broken parts. As far as the springs that the rods come down to the pump are working ok. They move up and down in their rotating as required. I took apart the spacer and water pump. I cleaned out every hole and checked for any blockage or broken parts and found none and blew out everything. Replaced any defective O rings and checked all springs. All the rubber and plastic seal are ok ( where the 3 rods come down threw ) are ok. After putting it back together and started motor there is no preesure other that what the hose is providing. I took off the spray gun hose and water comes out ok, then I started the motor with the spray gun hose still off and no pressure at all with motor running other than pressure from hose. What could be causing it not to build up any pressure ? What parts do you think would need replaced or is the pump just shot ?

Thank you Gary

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Washers , Garage Organization & Shelving
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2 Answers from these members:
Mark T
Thank you for your question.

I am sorry you are having a problem with the pressure washer. Usually the problem is a stuck unloader valve. The unloader valve opens when the handle is not pulled to keep the pump from building to much pressure. If the unloader does not close when the handle is pulled, it will not build pressure. I recommend checking the unloader first. I have marked the unloader in the image below. Remove the unloader and inspect the parts. You can clean the parts with WD-40.The spring is stout and hard to push but make sure the parts move freely. If the pump will not build pressure after cleaning, I suspect the pump is the problem.

If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations:

Sears Home Services

.

Here is a link to order any parts you need.

Sears Parts Direct

.

Thank you for using Manage my life.

Mark T.
by Mark T Earned 1,607 community points in Washers
August 15th, 2011
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Manage My Life
I understand how diffcult it is when your equipment does not want to work properly. While you are waiting for your expert answer, I have found a link that will provide some infromation on the issue. It sounds like there is a part failure in the pump, but the only way to know for sure is to dissamble it and inspected the parts individually. I hope this helps.
by Manage My Life
August 12th, 2011
Answered in 7 minutes
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