To Next PageTo Next PageHow to start Graco 390 Electric Airless Sprayer Paint Sprayer if motor won’t operate?
To resolve a motor that won’t operate on your Graco Paint Sprayer, first, slowly increase the pressure setting to see if the motor starts. The motor won't run if the pressure control knob is set at minimum. If this doesn't work, the spray tip or fluid filter may be clogged.
Why does my Graco 390 Electric Airless Sprayer Paint Sprayer motor run and pump strokes but no paint comes out?
If the motor runs and the pump strokes on your Graco Paint Sprayer, ensure the prime valve is closed. If it's already closed, refill the paint supply and reprime the pump. Also, remove and clean the intake strainer, then reinstall it. Tighten the nut on the suction hose and check the o-rings on the swivel to make sure the suction hose isn't leaking air.
Why is my Graco 390 Electric Airless Sprayer output so low?
If your Graco Paint Sprayer has low output, start by relieving the pressure and replacing the worn spray tip. Also, make sure the pump doesn't continue to stroke when the gun trigger is released, and if it does, service the pump. Check the electric supply with a voltmeter; it must read 100-130 VAC for 110-120 VAC models and 210-255 for 240 VAC models, as low voltages reduce sprayer performance.
What to do if Graco 390 Electric Airless Sprayer Paint Sprayer motor is hot and runs intermittently?
If your Graco Paint Sprayer motor is hot and runs intermittently, move the sprayer to a shaded, cooler area if possible, ensuring the ambient temperature is not more than 115°F (46°C) and that the sprayer is not in direct sunlight. Also, check the tightness of the pump packing nut. Overtightening restricts pump action and damages packings, so loosen the packing nut.
What to do if Graco 390 Electric Airless Sprayer Paint Sprayer motor runs but pump does not stroke?
If the Graco Paint Sprayer motor runs, but the pump doesn't stroke, replace the pump pin if it is missing. Ensure the retaining spring is fully in the groove all around the connecting rod. Also, inspect the connecting rod assembly for damage and replace if necessary. Check the drive housing assembly and gears for damage and replace if needed.
General| Brand | Graco |
|---|---|
| Model | 390 Electric Airless Sprayer |
| Category | Paint Sprayer |
| Language | English |
Covers risks associated with flammable fumes and ignition sources.
Details risks of electric shock due to improper grounding, setup, or usage.
Warns of serious injury from high-pressure fluid piercing skin, requiring immediate treatment.
Highlights dangers from exceeding pressure limits, using incompatible fluids, or altering equipment.
Covers toxic fluid or fumes hazards and specifies required personal protective equipment.
Lists and illustrates components for the spray gun stand configuration.
Lists and illustrates components for the spray gun Hi-Boy configuration.
Details electrical supply needs and proper grounding for safe sprayer operation.
Diagnoses and resolves problems related to the motor not starting or running.
Addresses issues with power supply, wiring, fuses, and control board connections.
Helps identify causes for reduced fluid delivery or sprayer performance.
Troubleshoots problems like intermittent motor operation or pump stroke failure.
Tests the motor armature for electrical shorts by checking its coasting ability.
Checks electrical continuity of the motor armature, brushes, and wiring.
