Question about Wagner Power Products 0154842 Medium Spray Gun Filter, 50 Mesh

2 Answers

I have a wagner 404 Plus sprayer. It was working fine, but started loosing pressure while spraying. I checked and cleaned all filters, thined the material some more, but still would not spray. I also took apart and cleaned the inlet and outlet valves, Changed gun filter, still no help. This machine has not been used that much, and I've always followed the cleanup and storage procedures in the manual. It does prime, but doesent build up enough pressure to spray. Any other sugguestions.

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  • John Rogers Aug 03, 2010

    Wagner 404 plus airless paint sprayer. works in prime mode, circulating paint through pump. when turned to spray mode, does not build pressure to spray. I have done all troubleshooting outlined in manual, still can't get to operate properly. This unit is about 3 yrs old, but has not been used that much. Less than 10 gallons sprayed, and I always followed cleaning and storage directions after each use. This was working well for about 5 mins, when lost pressure. Any sugguestions on what to do next.

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  • Master
  • 2,030 Answers

It sounds like one of two things...

either the pump seals need replaced or the motor is not running fast enough under load.

Check for loose wiring on the motor, the brush holders and condition, and make sure that the air path to cool the motor is clean and free of obstructions.

Posted on Aug 03, 2010

  • Skyfun Oct 04, 2010

    I have a Wagner 404 - it won't pump at all - motor is fine, just something wrong in the pump itself.
    Where can I buy a new pump and at what cost?
    Wally,
    Lakewood CA.

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  • Master
  • 1,051 Answers

Did you make sure the paint container is properly sealed and not letting pressure to release? You may need to remove top and clean rim of container and top.

Posted on Aug 02, 2010

  • 1 more comment 
  • John Rogers Aug 02, 2010

    This sprayer is designed to syphon the paint out of an open gallon pail, which it does, In the prime mode, it will circulate paint through the pump, problem is when I switch to spray, it doesn't build the pressure needed to properly spray, even with the pressure control knob turned to max pressure.

  • Bob Korsu
    Bob Korsu Aug 03, 2010

    Since there's enough pressure to prime the problem is almost certainly in the spray gun (probably at the trigger) Can you open the gun and make sure the pressure release spring is engaged correctly?

  • Bob Korsu
    Bob Korsu Aug 13, 2010

    Try siphoning some paint thinner through the unit. That should clear any obstruction and loosen any stuck parts.

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