Troubleshooting - Graco FinishPro 311911C Repair Manual

Troubleshooting

Troubleshooting
Problem
Sprayer Won't Operate
Basic Fluid Pressure
Basic Mechanical
Basic Air Pressure
8
What To Check
(If check is OK, go to next check)
1. Pressure control knob setting. Motor
will not run if set at minimum (fully
counter-clockwise).
2. Spray tip or fluid filter may be
clogged.
1. Pump frozen or hardened paint
2. Displacement pump connecting rod
pin. Pin must be completely pushed
into connecting rod and retaining
spring must be firmly in groove or
pump pin.
3. Motor. Remove drive housing
assembly. See page 15, Drive Hous-
ing Replacement. Try to rotate fan
by hand.
1. Power/function selector.
2. Spray air pressure regulator may be
closed (FinishPro 395)
3. Air valve at gun may be closed
What To Do
(When check is not OK, refer to this column)
Slowly increase pressure setting to see if motor
starts.
Relieve pressure, page 7. Then clear clog or clean
gun filter. Refer to gun instruction manual, 311937.
Thaw sprayer if water or water-based paint has fro-
zen in sprayer. Place sprayer in warm area to thaw.
Do not start sprayer until thawed completely. If paint
hardened (dried) in sprayer, replace pump packings.
See page 13, Displacement Pump Replacement.
Push pin into place and secure with spring retainer.
See page 13, Displacement Pump Replacement.
Replace motor if fan won't turn. See page 34, Motor
Replacement.
Ensure selection is AA.
Pull air regulator to unlock and turn clockwise to
open.
Turn air regulator counter-clockwise to open.
311911C