Symptom | Possible Cause | Possible Solution | ||
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Loud repetitious noise | 1. | Pulley setscrews or keys | 1. | Inspect keys and set- |
coming from machine. |
| are missing or loose. |
| screws. Replace or |
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| tighten if necessary. |
| 2. | Motor fan is hitting the | 2. | Adjust fan cover mounting |
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| cover. |
| position, tighten fan, or |
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| shim fan cover. |
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Low pressure at the | 1. | Pressure regulator. | 1. | Adjust pressure regulator, |
tool. |
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| if no improvement, inspect |
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| regulator for leaks or |
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| replace. |
| 2. | Air leaks in hoses. | 2. | Check air hoses and all |
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| connections for leaks (see |
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| Page 20). |
| 3. | Pressure gauge bad. | 3. | Replace the pressure |
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| gauge. |
| 4. | Pressure switch turns the | 4. | Adjust the pressure switch |
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| motor OFF too soon. |
| (see Page 21). |
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Low pressure at the | 1. | Air leaks in tanks or deliv- | 1. | Check air tanks, pipes and |
tanks, or tank pressure |
| ery pipes. |
| all connections for leaks |
drops after compressor |
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| (see Page 20). |
is turned OFF. | 2. | Drain valve open. | 2. | Close drain valve. |
| 3. | Air filter clogged. | 3. | Inspect and clean air filter. |
| 4. | Leaking check valve. | 4. | Repair the check valve |
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| (see Page 19). |
| 5. | Pressure relief valve | 5. | Replace pressure relief |
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| releasing below 120 PSI. |
| valve. |
| 6. | Gaskets leaking. | 6. | Check gaskets on cylinder |
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| head assembly, repair or |
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| replace as needed. |
| 7. | Worn rings. | 7. | Inspect and replace pump |
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| piston rings. |
| 8. | Pressure switch turns the | 8. | Adjust the pressure switch |
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| motor OFF too soon. |
| (see Page 21). |
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Compressor knocking. | 1. | Improper oil level. | 1. | Check oil level and add oil |
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| (see Page 9). |
| 2. | Air filter clogged. | 2. | Inspect and clean air filter. |
| 3. | Piston assembly loose. | 3. | Inspect and repair piston |
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| and connecting rod. |
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Pressure relief valve | 1. | Pressure switch adjusted | 1. | Adjust the pressure switch |
stays open and motor |
| too high. |
| (see Page 21) |
won’t stop running. | 2. | Faulty pressure switch, | 2. | Turn compressor OFF, |
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| unit is trying to overpres- |
| unplug from power sup- |
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| sure the tank. |
| ply, and empty tank. |
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| DO NOT USE until switch |
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| is replaced. |
| 3. | Faulty pressure relief | 3. | Relief valve is reliev- |
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| valve. |
| ing pressure too early. |
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| Replace pressure relief |
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| valve. |
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Model G0464/G0465/G0467/G0468/G0470 Air Compressors |
