Troubleshooting
WARNING
SKIN INJECTION HAZARD
To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief Procedure on page 10.
Check everything in the troubleshooting chart before disassembling the sprayer.
PROBLEM | CAUSE | |
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| |
Gas engine doesn’t work properly. |
| |
|
| |
Gas engine will not start. |
| |
|
| |
Gas engine operates, but | Hydraulic motor stalled. | |
displacement pump doesn’t |
| |
operate. |
| |
| 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. | |
|
| |
Displacement pump operates, but | Piston ball check not seating properly. | |
output is low on upstroke. | Piston packings worn or damaged. | |
| ||
|
| |
Displacement pump operates but | Piston packings worn or damaged. | |
output is low on downstroke and/ | Intake valve ball check not seating | |
or on both strokes. | ||
properly. | ||
| ||
|
| |
Paint leaks into wetcup. | Loose | |
| Throat packings worn or damaged. | |
|
| |
Excessive leakage around | Piston rod seal worn or damaged. | |
hydraulic motor piston rod wiper. |
| |
|
| |
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. | |
|
| |
The sprayer overheats. | Cooler or blower is worn or damaged. | |
|
| |
Spitting from gun. | Air in fluid pump or hose. | |
| Fluid supply is low or empty. | |
|
|
SOLUTION
Consult engine manual, supplied.
Check battery.
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.
Service piston ball check. See pump manual. Replace packings. See pump manual.
Replace packings. See pump manual.
Service intake valve ball check. See pump manual.
Tighten just enough to stop leakage. Replace packings. See pump manual.
Replace these parts. See manual 307158.
Increase pressure. See page 11.
Clean filter.
Return sprayer for repair.
Return sprayer for repair.
Use larger diameter hose.
Replace. See page 15.
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.
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