Graco FinishPro 311911C Repair Manual page 12

Troubleshooting
Problem
Low air output at gun
Air compressor does not run
Poor air spray pattern
Water in pattern
12
What To Check
(If check is OK, go to next check)
4. Damaged (leaking) air supply hose.
5. Air intake filter clogged.
6. Mechanical air unloader stuck open. Replace mechanical air unloader.
7. Electrical air unloader stuck open.
1.
Power/function selector switch
2.
Voltage to compressor below 105
Vac for 110 - 120 Vac models or
below 210 Vac for 240 Vac models
3. Loose power connections
4. Excessive head pressure (compres-
sor hums)
5. Excessive head pressure (compres-
sor hums)
6. Excessive head pressure (compres-
sor hums)
7. Excessive head pressure (compres-
sor hums)
8. Compressor thermal switch is open.
Ensure ambient temperature is
below 115 °F (46 °C).
9. Low compressor performance.
1.
Air cap air ports clogged.
2. .
Air cap worn
3.
Worn spray tip.
1.
Water in air line.
What To Do
(When check is not OK, refer to this column)
Replace air supply hose.
Clean or replace air intake filter kit.
Replace electrical air unloader.
Set function selector switch to AA; replace switch.
Try another outlet. Reduce extension cord length or
increase extension cord gauge.
Verify all connections are firm.
Moisture frozen in air supply line.
Wait for air pressure to bleed to zero.
Electrical air unloader stuck closed. Replace
electrical air unloader.
Open air regulator (FinishPro 395)
Install air line
Do Startup, Operation Manual 311905
Move sprayer to shaded, cooler area.
Worn compressor; repair compressor with
Compressor Service Kit 288723.
Soak in solvent to clean.
Replace air cap.
Relieve pressure, page 7. Replace tip. Refer to gun
instruction manual, 311937.
Add Water Separator Kit 289535 to air line.
311911C