| Table 1: | Air Compressor Not Unloading |
| Table 2: | Noisy Operation |
| Table 3: | High or Low Pressure |
| Table 4: | Oil in the Air Supply |
| Table 5: | Fails to Maintain Sufficient Pressure |
Problem | Action |
|---|---|
Damaged inlet valve plunger or spring. | Replace any faulty parts. |
Intake cavity restrictions. | Remove the restrictions and clean the cavity. |
Malfunctioning governor. | Overhaul or replace the governor. Refer to Air Compressor Governor Valve Replacement . |
Unloader line or cavity to the governor is restricted. | Remove the restriction. |
Unloader mechanism is binding or sticking. | Overhaul or replace the cylinder head assembly. Call 1-800-AIR-BRAK (1-800-247-2725). |
Problem | Action | ||||||
|---|---|---|---|---|---|---|---|
The cylinder head or the air compressor discharge pipe is restricted. | Remove the restriction or clean. | ||||||
The bearings are worn. | Refer to Air Compressor Replacement . Call 1-800-AIR-BRAK (1-800-247-2725). | ||||||
The air compressor is not getting the proper lubrication. | Check the engine lubrication system, the air compressor oil inlet hose, and the air compressor oil outlet hose, (if equipped). Repair or replace as needed. | ||||||
The air compressor crankshaft is worn too much. | Refer to Air Compressor Replacement . Call 1-800-AIR-BRAK (1-800-247-2725). | ||||||
The air compressor gear is worn out or loose. |
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Air compressor pulley. |
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Problem | Action |
|---|---|
The governor is out of adjustment. | Adjust the governor. |
The governor is leaking. | Overhaul or replace the governor. Refer to Air Compressor Governor Valve Replacement . |
The air compressor is leaking. | Check the fittings, the bolts, and the mating surfaces. Tighten or repair as needed. |
The unloader is not functioning. | Overhaul the cylinder head assembly. |
The governor is faulty. | Overhaul or replace the governor. Refer to Air Compressor Governor Valve Replacement . |
Problem | Action | ||||
|---|---|---|---|---|---|
The piston rings are worn out. | Overhaul or replace the air compressor.
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The engine air filter is dirty (diesel engine). | Replace the engine air filter. Refer to Air Cleaner Element Replacement . | ||||
The air compressor air strainer filter is dirty (gasoline engine). | Replace the air compressor air strainer filter. Refer to Air Compressor Air Strainer Filter Replacement . | ||||
The inlet vacuum is high. | Clean or repair as needed. | ||||
The air compressor oil outlet hose is restricted. | Remove the restriction or replace the air compressor oil outlet hose. Refer to Air Compressor Replacement . | ||||
The engine oil pressure is too high. |
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The air compressor oil inlet hose is flooded with water. |
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The air compressor oil outlet hose is flooded with water (gasoline engine). |
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The air compressor oil outlet return passage is flooded with water (diesel engine). |
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The piston rings are not properly seated. |
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The back pressure exists from the engine crankcase. | Determine the cause of the back pressure and repair. |
Problem | Action | ||||
|---|---|---|---|---|---|
The air compressor cylinder head intake cavities, discharge cavities or in the discharge pipe are restricted. | Remove the restriction and clean. | ||||
The discharge valves are leaking or broken. |
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Too much wear is evident. |
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Inlet valve is stuck open. |
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The inlet valves are worn. |
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The system has excessive leakage or usage. | Check and repair as needed. | ||||
The engine air filter is dirty (diesel engine). |
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The air compressor air strainer filter is dirty. |
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