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Troubleshooting
WARNING
S
K
IN INJECTION HAZARD
To reduce the risk of serious injury,
whenever yo u are instructed to relieve
pressu re, follow the Pressure Relief
Procedure on page 10.
Check everything in the troubleshooting chart before disassembling the sprayer.
PROBLEM CAUSE SOLUTION
Gas engine doesn’t work properly. Consult engine manual, supplied.
Gas engine will not start. Check battery.
Gas engine operates, but
displacement pump doesn’t
operate.
Hydraulic motor stalled.
Pressure setting too low.
Displacement pump outlet filter (if
used) is dirty or clogged.
Tip or tip filter (if used) is clogged.
Hydraulic fluid too low.
Hydraulic pump worn or damaged.
Hydraulic motor worn or damaged.
Displacement pump rod seized by
dried paint.
Turn the ignition key to OFF. Firmly press
straight down on motor reset button. Restart
sprayer, see page 10. If it doesn’t start, see
manual 307158.
Increase pressure. See page 11.
Clean the filter.
Remove tip and/or filter and clean.
Shut off sprayer and add fluid immediately*. See
page 5.
Return sprayer for repair.
Return sprayer for repair.
Service pump. See pump manual.
Displacement pump operates, but
output is low on upstroke.
Piston ball check not seating properly.
Piston packings worn or damaged.
Service piston ball check. See pump manual.
Replace packings. See pump manual.
Displacement pump operates but
output is low on downstroke and/
or on both strokes.
Piston packings worn or damaged.
Intake valve ball check not seating
properly.
Replace packings. See pump manual.
Service intake valve ball check. See pump
manual.
Paint leaks into wetcup. Loose wet--cup.
Throat packings worn or damaged.
Tighten just enough to stop leakage.
Replace packings. See pump manual.
Excessive leakage around
hydraulic motor piston rod wiper.
Piston rod seal worn or damaged. Replace these parts. See manual 307158.
Fluid delivery is low. Pressure setting too low.
Displacement pump outlet filter (if
used) is dirty or clogged.
Hydraulic pump is worn or damaged.
Hydraulic motor is worn or damaged.
Large pressure drop in fluid hose.
Increase pressure. See page 11.
Clean filter.
Return sprayer for repair.
Return sprayer for repair.
Use larger diameter hose.
The sprayer overheats. Cooler or blower is worn or damaged. Replace. See page 15.
Spitting from gun. Air in fluid pump or hose.
Fluid supply is low or empty.
Check for loose connections on siphon
assembly, tighten, then reprime pump.
Refill supply container.
*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid. See pages 6 and 37.