Symptom | Possible Cause | Possible Solution | ||
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Air leaks from pressure | 1. | Faulty check valve. | 1. | Repair the check valve |
switch. |
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| (Page 18). |
| 2. | Faulty pressure switch. | 2. | Replace pressure switch. |
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Low pressure at the | 1. | Air leaks in tanks or deliv- | 1. | Check air tank, pipes and |
tank, or tank pressure |
| ery pipes. |
| all connections for leaks. |
drops after compressor | 2. | Drain valve open. | 2. | Close drain valve. |
is turned OFF. | 3. | Air filter clogged. | 3. | Inspect and clean air fil- |
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| ter. |
| 4. | Pressure switch turns the | 4. | Adjust the pressure |
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| motor OFF too soon. |
| switch (Page 20). |
| 5. | Leaking check valve. | 5. | Repair the check valve |
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| (Page 18). |
| 6. | Pressure relief valve | 6. | Replace pressure relief |
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| releasing below 110 PSI. |
| valve. |
| 7. | Gaskets leaking. | 7. | Check gaskets on cylin- |
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| der head assembly, repair |
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| or replace as needed. |
| 8. | Worn rings. | 8. | Inspect and replace pump |
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| piston rings. |
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Pressure relief valve | 1. | Pressure switch adjusted | 1. | Adjust the pressure |
stays open and motor |
| too high. |
| switch (Page 20) |
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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Air tool has low supply | 1. | 1. | Replace filter or | |
pressure but compres- |
| or clogged (if used). |
| filter assembly. |
sor has sufficient air | 2. | 2. | Drain water separator. | |
pressure. |
| full (if used). |
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| 3. | Pressure regulator. | 3. | Adjust pressure regula- |
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| tor, if no improvement, |
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| inspect regulator for leaks |
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| or replace. |
| 4. | Air leaks in hoses. | 4. | Check air hoses and all |
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| connections for leaks . |
| 5. | Pressure gauge bad. | 5. | Replace the pressure |
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| gauge. |
| 6. | Pressure switch turns the | 6. | Adjust the pressure |
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| motor OFF too soon. |
| switch (Page 20). |
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Model T21888 (Mfg. since 2/10) |
