Advanced Troubleshooting
General Problem: Low or Fluctuating Output
Specific Problem | Cause | Solution |
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Pump cycles, but output is low or | See Basic Troubleshooting, |
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surging. | page 11. |
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| Worn or obstructed inlet and | Check for worn pump valves as follows: |
| outlet valves. | Prime sprayer with paint. Turn the Prime/Spray valve |
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| to SPRAY position. Turn pressure control fully |
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| clockwise. |
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| Trigger spray gun briefly. |
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| When spray gun trigger is released pump should |
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| cycle momentarily and stop. |
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| If pump continues to cycle, pump valves may be |
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| worn or obstructed. |
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| For replacement inlet and outlet valve kits, see List |
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| of Kits, page 26. |
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| Prime/Spray valve is leaking out | Check Prime/Spray valve for debris trapped on seat |
| drain line when Prime/Spray | and for worn parts. Torque to |
| valve is in SPRAY position. | |
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| Prime/Spray Valve Kit, page 26. |
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| Voltage from electrical outlet is | Check voltage of outlet. Meter must read 85 to 130V |
| too low. Low voltages reduce | AC. |
| sprayer performance. |
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| Extension cord is too long or not | Replace extension cord. |
| heavy enough gauge. | See Grounding and Electrical Requirements, |
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| page 6. |
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| Leads from motor or pressure | Be sure terminals are centered and firmly |
| switch to control board are | connected. Inspect for pinched wiring and wiring |
| damaged, loose, pinched, or | insulation and terminals for signs of overheating. |
| overheated. | Replace any loose terminals or damaged wiring. |
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| Securely reconnect terminals. |
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| Motor brushes are worn. | Check length of BOTH brushes (brushes do not |
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| wear evenly on both sides of the motor). Brush |
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| length must be 0.25 in. (6.4mm). If brushes are worn |
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| replace motor using Motor Kit, page 26. |
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| Motor brush springs are broken. | If springs are broken, replace motor using Motor Kit, |
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| page 26. |
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| Motor brushes are binding in | Clean brush holders. Remove carbon dust with small |
| brush holders. | cleaning brush. |
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| Motor stops before sprayer | Replace pressure control using Pressure Control |
| reaches correct pressure (stall | Switch Kit, page 26. |
| pressure is too low). |
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| Control board is damaged. | See Control Board Diagnostics, page 25. If |
| CAUTION: Do not perform | damaged, replace control board using Control |
| Board Kit, page 26. | |
| control board diagnostics until |
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| you have determined the |
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| armature is good. A damaged |
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| armature can burn out a good |
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| control board. |
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312667B | 21 |