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Troubleshooting
62
3A9099A Operation, Repair, Parts
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.
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 for shorter hose.
The sprayer overheats.
Paint buildup on hydraulic components.
Clean.
Oil level is low.
Fill with oil.
Excessive hydraulic pump
noise.
Low hydraulic fluid level.
Shut off sprayer. Add fluid.
Gallon (liter) counter not
adding fluid volume.
Fluid pressure not high enough.
Must be over 800 psi (55 bar) for counter to
add.
Broken or disconnected pump counter wire,
both pumps.
Check wires and connections. Replace any
broken wires
Missing or damaged magnet.
Reposition or replace magnet on pump, see
Parts manual (Pump parts) for magnet
location.
Bad sensor, both pumps.
Replace sensor.
Sprayer operates, but
display does not.
Bad connection between control board and
Display.
Remove Display and reconnect.
Display damaged.
Replace Display.
Distance not adding properly
(Measure mode will be
inaccurate and speed will be
wrong).
Machine not calibrated.
Perform calibration procedure.
Rear tire pressure is too low or too high.
Adjust tire pressure to 55 +/- 5 psi (380 +/-
34kPa).
Gear teeth missing or damaged (right side
when standing on platform).
Replace distance gear/wheel hub.
Distance sensor is loose or broken.
Reconnect or replace sensor.
Mils not calculating or
calculates wrong.
Distance sensor.
See “Distance counter not operating
properly”.
Gallon counter.
See “Gallon (liter) counter not adding fluid
volume.”
Line width not entered.
Set line width on main striping screen.
Bad or damaged control board.
Replace control board.
Fluid spray starts after spray
icon is shown on Display.
Interrupter is improperly positioned.
Turn screw counterclockwise until spray icon
synchronizes with fluid spray, page 25.
Spray icon does not show on
Display when fluid is
sprayed.
Loose connector.
Check that 5-pin connector and reed switch
are properly connected.
Interrupter is improperly positioned.
Turn screw counterclockwise until spray icon
synchronizes with fluid spray, page 25.
Problem
Cause
Solution