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. Check that | ||
| ply; closed or clogged valves. | 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 bottom | ||
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| of its stroke; keep the | ||
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| Graco throat seal liquid (TSL). | ||
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| Dirty, worn, or damaged air motor | Clean or repair air motor. See manual | ||
| parts. | 312796. |
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| DataTrak models only: Air valve can- | Enable runaway protection (See DataTrak | ||
| not cycle because solenoid pin is | Operation, Setup Mode, page 20). Bleed | ||
| extended | air from motor. Press | on the DataTrak | |
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| display to retract solenoid pin. | ||
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Pump operates, but output is | Restricted line or inadequate air sup- | Clear line or increase air supply. Check that | ||
low on both strokes. | ply; closed or clogged valves. | 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 312794. | ||
| pump. |
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Pump operates, but output is | Held open or worn ball check valves | Clear valve; replace packings. See manual | ||
low on downstroke. | or piston packings. | 312794. |
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Erratic or accelerated pump | Exhausted fluid supply. | Refill and prime. |
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speed. |
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Held open or worn ball check valves | Clear valve, replace packings; see manual | |||
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| or packings. | 312794. |
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Fluid being pumped is visible | Worn throat packings. | Replace throat packings. See manual | ||
in the 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 | 313255K |