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Heather PenningtonDec 1, 2025
What to do if the engine runs but the pump doesn't on my Graco GMAX 3400?
- KKathy BurtonDec 1, 2025
If the engine of your Graco Paint Sprayer operates, but the displacement pump does not, check these potential causes: * An error code might be displayed. * The pump switch might be OFF. Ensure it is turned ON. * The pressure setting might be too low. Turn the pressure adjusting knob clockwise to increase the pressure. * The fluid filter could be dirty. Clean the filter. * The tip or tip filter might be clogged. Clean the tip or tip filter. * The displacement pump piston rod could be stuck due to dried paint. * The connecting rod or drive housing might be worn or damaged. * Electrical power may not be energizing the clutch field. With the pump switch ON and the pressure turned to MAXIMUM, use a test light to check for power between the clutch test points on the control boar...
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