Troubleshooting
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 12.
1.Relieve the pressure.
2.Check all possible causes and problems before disassembling the pump.
PROBLEM | CAUSE | SOLUTION |
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Pump fails to operate | Restricted line or inadequate air/hydraulic | Clear; increase air/hydraulic supply. |
| supply; closed or clogged valves | Check that valves are open. |
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| Obstructed fluid hose or gun/valve; | Open, clear*; use hose with larger ID. |
| fluid hose ID is too small |
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| Fluid dried on the displacement rod | Clean; always stop pump at bottom of stroke; |
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| keep |
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| Dirty, worn, or damaged motor parts | Clean or repair; see separate motor manual. |
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Pump operates, but out- | Restricted line or inadequate air/hydraulic | Clear; increase air/hydraulic supply. |
put low on both strokes | supply; closed or clogged valves | Check that valves are open. |
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| Obstructed fluid hose or gun/valve; | Open, clear*; use hose with larger ID. |
| fluid hose ID is too small |
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| Bleeder valve open | Close. |
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| Air leaking into supply container | Check ram plate seal. |
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| Fluid too heavy for pump priming | Use bleeder valve (see pages 12 and 14); use ram. |
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| Worn packings in displacement pump | Replace packings. |
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Pump operates, but out- | Fluid too heavy for pump priming | Use bleeder valve (see pages 12 and 14); use ram. |
put low on downstroke |
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| Held open or worn intake valve or seals | Clear valve; replace seals. |
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Pump operates, but out- | Held open or worn piston valve or seals | Clear valve; replace seals. |
put low on upstroke |
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Erratic or accelerated | Exhausted fluid supply | Refill and prime. |
pump speed |
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| Fluid too heavy for pump priming | Use bleeder valve (see pages 12 and 14); use ram. |
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| Held open or worn piston valve or seals | Clear valve; replace seals. |
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| Held open or worn priming piston | Clear; service. |
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| Worn packings in displacement pump | Replace packings. |
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*To determine if the fluid hose or gun is obstructed, relieve the pressure. Disconnect the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air/hydraulic power just enough to start the pump. If the pump starts when the air/hydraulic power is turned on, the obstruction is in the fluid hose or gun.
NOTE:If you experience air motor icing, contact your Graco distributor.
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