| NOTICE |
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Do not exceed the air pressure of 815 ± 35 kPa (114 ± 5 psi) or damage can occur to the air system components. |
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| Illustration 1 | g02021937 |
(1) Air compressor (2) Air compressor governor | |
- Drain the air slowly at the drain valve for the air tank until the air pressure drops to 480 kPa (70 psi).
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| Illustration 2 | g02021936 |
Location of the drain valve for the air tanks | |
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When opening the drain valve, wear protective gloves, protective face shield, protective clothing and protective shoes. Pressurized air could cause debris to be blown and result in personal injury. |
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- Start Cat ET and locate the air system pressure.
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| Illustration 3 | g02021938 |
Typical view | |
- Start the engine and run the engine at high idle.
- Allow the air system pressure to reach 585 kPa (85 psi). Record the amount of time that is required for the air system pressure to increase from 585 kPa (85 psi) to 690 kPa (100 psi).
Air compressor (1) should build up pressure from 585 kPa (85 psi) to 690 kPa (100 psi) in 40 seconds or less. If the time that is measured is greater than 40 seconds, check for leaks and check for restrictions in the air system. If no leaks or restrictions are found in the air system, air compressor (2) may have a problem. Refer to Service Manual, REG00914, "Air Compressors Tu-Flo 300, 400, 500, 501, 600, 700 & 1000 Compressors".