Troubleshooting
334194A
15
Troubleshooting
PROBLEM
CAUSE
SOLUTION
Gas engine pulls hard (will not start). Hydraulic pressure is too high.
Turn hydraulic pressure knob coun-
terclockwise to lowest setting.
Gas engine does not start.
Switch OFF, low oil, no gasoline or
dead battery.
Consult engine manual, supplied.
Change battery if necessary.
Gas engine doesn't work properly.
Faulty engine.
Consult engine manual, supplied.
Gas engine operates, but displace-
ment pump doesn't operate.
Pump valve is OFF.
Set pump valve ON.
Pressure setting too low.
Increase pressure.
Tip or tip filter (if used) is clogged.
Remove tip and/or filter and clean.
Hydraulic fluid too low.
Shut off sprayer. Add fluid*.
Belt worn, broken or off.
Replace belt.
Hydraulic pump worn or damaged.
Bring sprayer to Graco distributor for
repair.
Hydraulic motor not shifting.
Set pump valve OFF. Turn pressure
down. Turn engine OFF. Pry rod up
or down until hydraulic motor shifts.
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 or shorter hose.
The sprayer overheats.
Paint buildup on hydraulic compo-
nents.
Clean hydraulic components.
Oil level is low.
Fill with oil.
Excessive hydraulic pump noise.
Low hydraulic fluid level.
Turn sprayer OFF. Add fluid*.
*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid, page 25.
