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Troubleshooting
332156B 15
Troubleshooting
PROBLEM CAUSE SOLUTION
Gas engine pulls hard (will not start). Hydraulic pressure is too high. Turn hydraulic pressure knob
counterclockwise to lowest setting.
Gas engine does not start. Switch OFF, low oil, no gasoline, or
dead battery.
Consult engine manual, supplied.
Replace battery if necessary.
Gas engine doesn't work properly. Faulty engine. Consult engine manual, supplied.
Gas engine operates, but
displacement pump doesn't operate.
Pump valve is OFF. Set pump valve ON.
Pressure setting too low. Increase pressure.
Displacement pump outlet filter
(if used) is dirty or clogged.
Clean the filter.
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. See manual 332157.
Hydraulic pump worn or damaged. Bring sprayer to Graco distributor for
repair.
Dried paint seized paint pump rod. Service pump. See manuals 308043,
311825, 311762.
Hydraulic motor not shifting. Set pump valve OFF. Turn pressure
down. Turn engine OFF. Pry rod up
or down until hydraulic motor shifts.
See manual 332157.
Displacement pump operates, but
output is low on upstroke.
Piston ball check not seating
properly.
Service piston ball check.
See manual 308043, 311825,
311762.
Piston packings worn or damaged. Replace packings. See manuals
308043, 311825, 311762.
Displacement pump operates but
output is low on downstroke and/or
on both strokes.
Piston packings worn or damaged. Tighten packing nut or replace
packings. See manuals 308043,
311825, 311762.
Intake valve ball check not seating
properly.
Service intake valve ball check.
See manuals 308043, 311825,
311762.
Suction tube air leak. Repair or replace suction tube.
Paint leaks and runs over side of
wetcup.
Loose wet-cup. Tighten wet-cup enough to stop
leakage.
Throat packings worn or damaged. Replace packings.
See manuals 308043, 311825,
311762.
Excessive leakage around hydraulic
motor piston rod wiper.
Piston rod seal worn or damaged. Replace these parts.
See manuals 308043, 311825,
311762.