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Troubleshooting Chart
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 10.
1.Relieve the pressure.
2.Check all possible causes and problems before disassembling the pump.
PROBLEM |
| CAUSE | SOLUTION | |
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The pump fails to oper- | Valves are closed or clogged. | Clear the air line; increase the air supply. | ||
ate. |
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| Check that the valves are open. |
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| The fluid hose or gun is obstructed. | Clear the hose or gun*; |
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| use a hose with a larger ID. |
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| Fluid has dried on the displacement rod. | Clean the rod; always stop the pump at the bottom |
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| of its stroke; keep the |
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| compatible solvent. |
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| Air motor parts are dirty, worn, or dam- | Clean or repair the air motor; |
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| aged. | see the separate motor manual. |
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The | pump | operates, | The air line is restricted or the air supply | Clear the air line; increase the air supply. |
but the output is low on | is inadequate. Valves are closed or | Check that the valves are open. | ||
both strokes. |
| clogged. |
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| The fluid hose or gun is obstructed; | Clear the hose or gun*; |
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| the fluid hose ID is too small. | use a hose with a larger ID. |
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| Worn packings in the displacement | Replace the packings. |
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| pump. |
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| Air motor parts are dirty, worn, or dam- | Clean or repair the air motor; |
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| aged. | see the separate motor manual. |
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| Held open or worn intake valve. | Clear or service the intake valve. |
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The | pump | operates, | Held open or worn intake valve. | Clear or service the intake valve. |
but the output is low on |
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the downstroke. |
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The | pump | operates, | Held open or worn piston valve | Clear the piston valve; replace the packings. |
but the output is low on | or packings. |
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the upstroke. |
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The | pump’s | speed is | The fluid supply is exhausted. | Refill the supply and prime the pump. |
erratic or accelerated. |
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| Held open or worn piston valve | Clear the piston valve; replace the packings. |
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| or packings. |
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| Held open or worn intake valve. | Clear or service the intake valve. |
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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 just enough to start the pump. If the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.
NOTE: If you experience air motor icing, call your Graco distributor.