Troubleshooting
10
312226P
Excessive leakage
around hydraulic motor
piston rod wiper.
Piston rod seal worn or damaged.
Replace these parts.
Fluid delivery is low.
Pressure setting too low.
Increase pressure. Manual 312190.
Displacement pump outlet filter (if used) is dirty or
clogged.
Clean filter.
Intake line to pump inlet is not tight.
Tighten.
Hydraulic motor is worn or damaged.
Bring sprayer to Graco distributor for repair.
Large pressure drop in fluid hose.
Use larger diameter or shorter hose.
The sprayer overheats.
Paint buildup on hydraulic components.
Clean.
Oil level is low.
Fill with oil, page 7.
Excessive hydraulic
pump noise.
Low hydraulic fluid level.
Shut off sprayer. Add fluid*, page 7.
Gallon counter not work-
ing.
Broken or disconnected wire.
Check wires and connections. Replace broken
wires.
Bad sensor.
Replace sensor.
Missing or damaged magnet.
Reposition or replace magnet.
Sprayer operates, but
display does not.
Bad connection between control board and dis-
play.
Remove display and reconnect.
Display damaged.
Replace display.
Loose cables.
Connect cables to back of control board.
Control board LED not flashing.
Replace control board.
Distance counter not
operating properly.
Trigger sensor not set correctly.
See “Spray icon does not show on display when
fluid is sprayed”.
Bad wiring connections.
Check connector, and reconnect.
Distance sensor not spaced correctly from gear.
Adjust space between sensor and gear to .050 -/+
.020 in. See page 16.
Distance sensor and gear not aligned.
Remove tire, and press in or pull out gear to align
sensor and gear.
Gear teeth missing or damaged.
Replace distance gear/wheel.
Wire cracked or broken.
Replace sensor.
Mils not calculating.
Distance sensor.
See “Distance counter not operating properly”.
Trigger sensor.
See “Spray icon does not show on display when
fluid is sprayed”.
Gallon counter.
See “Gallon counter not working”.
Bad or damaged control board.
Replace control board.
Fluid spray starts after
spray icon is shown on
display.
Interrupter (164) is improperly positioned.
Turn screw counterclockwise until spray icon syn-
chronizes with fluid spray.
Fluid spray starts before
spray icon is shown on
display.
Interrupter (164) is improperly positioned.
Turn screw clockwise until spray icon is synchro-
nized with fluid spray.
Problem
Cause
Solution
