Symptom Tree t073
| Cause | Correction |
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Fuel leak |
Check the fuel lines, fuel connections, and fuel filters for leaks using the combustible gas detector service tool. Refer to Procedures 006-063 and 006-064. |
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Load is excessive for engine horsepower rating |
Reduce the load on the engine. Refer to OEM specifications. |
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Air intake or exhaust leaks |
Inspect the air intake and exhaust systems for air leaks. Refer to the OEM service manual. |
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Air intake system restriction is above specification |
Inspect the air intake system for restriction. Replace the air filter. Refer to Procedure 010-031 in the Troubleshooting and Repair Manual B3.9, B4.5, and B5.9 Series Engines, Bulletin 3666087, or Procedure 010-031 in the Troubleshooting and Repair Manual C Series Engines, Bulletin 3666003. Refer to Procedure 3-08 in the Troubleshooting and Repair Manual NT 855 Engines, Bulletin 3810298, Procedure 3-04 in the Troubleshooting and Repair Manual N14 Engine, Bulletin 3666142, Procedure 3-08 in the Troubleshooting and Repair Manual K19 Engine, Bulletin 3810307, or Procedure 3-08 in the Troubleshooting and Repair Manual, K38 and K50 Series Engines, Bulletin 3810432. |
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Exhaust system restriction is not within specification |
Check the exhaust system for restrictions. Refer to Procedure 011-009 in the Troubleshooting and Repair Manual B3.9, B4.5, and B5.9 Series Engines, Bulletin 3666087, or Procedure 011-009 in the Troubleshooting and Repair Manual C Series Engines, Bulletin 3666003. Refer to Procedure 3-07 in the Troubleshooting and Repair Manual NT 855 Engines, Bulletin 3810298, Procedure 3-05 in the Troubleshooting and Repair Manual N14 Engine, Bulletin 3666142, Procedure 3-09 in the Troubleshooting and Repair Manual K19 Engine, Bulletin 3810307, or Procedure 3-09 in the Troubleshooting and Repair Manual, K38 and K50 Series Engines, Bulletin 3810432. |
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Ignition system is malfunctioning or misfiring |
Check the ignition system. Refer to Procedure 013-012, 013-014 or 013-016 and the Ignition System OEM Literature. |
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Throttle plate is malfunctioning |
Check the throttle plate for sticking. Refer to a Cummins Authorized Repair Facility. |
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Low or no fuel pressure at the fuel filter (primary pressure) |
Increase output pressure from the primary regulator. Refer to Procedure 005-042. |
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Low or no fuel pressure at the mixer (secondary pressure) |
Increase output pressure from the secondary regulator. |
