Troubleshooting
Troubleshooting
Relieve the pressure before checking or servicing the equipment.
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NOTE: Check all possible problems and causes before disassembling the pump.
Problem | Cause | Solution |
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Pump fails to operate. | Restricted line or inadequate air sup- | Clear line or increase air supply. |
| ply; closed or clogged valves. | Check that the valves are open. |
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| Obstructed fluid hose or gun; fluid | Open, clear*; use hose with larger ID. |
| hose ID is too small. |
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| Fluid dried on the displacement rod. | Clean; always stop the pump at the |
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| bottom of its stroke; keep the |
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| 1/3 filled with Graco throat seal liquid |
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| (TSL). |
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| Dirty, worn, or damaged air motor | Clean or repair air motor. See manual |
| parts. | 312796. |
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Pump operates, but output is low on | Restricted line or inadequate air sup- | Clear line or increase air supply. |
both strokes. | ply; closed or clogged valves. | Check that the valves are open. |
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| Obstructed fluid hose or gun; fluid | Open, clear*; use hose with larger ID. |
| hose ID is too small. |
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| Worn packings in displacement | Replace packings. See manual |
| pump. | 312794. |
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Pump operates, but output is low on | Held open or worn ball check valves | Clear valve; replace packings. See |
downstroke. | or piston packings. | manual 312794. |
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Erratic or accelerated pump speed. | Exhausted fluid supply. | Refill and prime. |
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| Held open or worn ball check valves | Clear valve, replace packings; see |
| or packings. | manual 312794. |
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Fluid being pumped is visible in the | Worn throat packings. | Replace throat packings. See manual |
TSL reservoir. |
| 312794. |
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*To determine if the fluid hose or gun is obstructed, relieve the pressure. Disconnect the fluid hose and place a con- tainer at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump. It the pump starts when the air is turned on, the obstruction is in the hose or gun.
18 | 313255F |
