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| Advanced Troubleshooting |
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Specific Problem | Cause | Solution |
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| Control board is damaged. | See Control Board Diagnostics, page 19. If |
| CAUTION: Do not perform | damaged replace control board using Control |
| control board diagnostics until | Board Kit, page 18. |
| you have determined the |
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| armature is good. A bad motor |
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| can burn out a good control |
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| board. |
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Motor runs and pump cycles, | Intake valve ball or outlet valve | Remove and clean valves and check balls and |
but pressure does not build up | ball is not seating properly | seats for nicks; replace if necessary. Strain paint |
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| before spraying to remove particles that could clog |
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| pump. Pump Service, page 20. |
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| Pump packings are worn or | Check for leaking around throat packing nut. |
| damaged | Replace pump packings if there are leaks. Pump |
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| Service, page 20. |
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| Prime/Spray Valve leaking | Check Prime/Spray Valve for debris trapped on |
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| seat and for worn parts. Torque to 21 N•m (185 |
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| Prime/Spray Drain Valve Kit, page 18. |
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Spray pattern has variations, | Leads from motor or pressure | Be sure terminals are centered and firmly |
pressure fluctuates | switch to control board are | connected. Inspect wiring insulation and terminals |
excessively, or motor runs very | damaged, loose or overheated | for signs of overheating. Replace any loose |
slowly |
| terminals or damaged wiring. Securely reconnect |
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| terminals. |
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| Pressure control switch leads | Make sure pressure control harness is routed |
| are pinched between pump | behind pump, through retention clip and |
| and drive housing or between | connected to control board connector on control |
| front cover and drive housing | board (connect with tab to right). |
| (XR9 only) |
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| Control board is damaged. | See Control Board Diagnostics, page 19. If |
| CAUTION: Do not perform | damaged, replace control board using Control |
| control board diagnostics until | Board Kit, page 18. |
| you have determined the |
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| armature is good. A bad |
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| armature can burn out a good |
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| control board. |
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| Pressure control switch is | Replace pressure control switch using Pressure |
| damaged or worn out | Control Switch Kit, page 18. |
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16 | 309477F |
