Caterpillar 3512C ATAAC Engine Engine

• When the engine oil pressure is increased beyond the low oil pressure setpoint, the GSC will inform the governor that the engine speed should be increased from IDLE to RATED rpm. 2301A Control
• The GSC+ detects an alarm fault
  Fix: Fault alarm indicator (26) is accompanied by an alarm fault code that is shown on the upper display (29) when the alarm codes key (30) is pressed.
• The GSC+ detects a shutdown fault
  Fix: The engine will shut down if the engine is running. The engine will not be allowed to start.
• The fault alarm indicator (3) flashes when the GSC detects an alarm fault. g00604607
• Overcrank
  Cause: Engine does not start within the setpoint for overcrank.
• Low oil pressure indicator flashes, and the engine is shut down.
  Cause: The engine oil pressure drops below the setpoints for low oil pressure shutdown that are programmed into the GSC. There are two low oil pressure setpoints. One setpoint is used when the engine is at idle speed. The other setpoint is used when the engine is at rated speed.
• Low oil pressure
  Cause: Engine oil pressure drops below the setpoints for low oil pressure shutdown that are programmed into the GSC+.
  Fix: The tow oil pressure indicator FLASHES, and the engine is shut down. The engine is not allowed to start until the fault is corrected.
• High water temperature indicator flashes, and the engine is shut down.
  Cause: The engine coolant temperature rises above the setpoint for high water temperature shutdown that is programmed into the GSC.
• High water temperature
  Cause: Engine coolant temperature rises above the setpoint for high water temperature shutdown that is programmed into the GSC+.
  Fix: The engine is shutdown and the engine is not allowed to start until the fault is corrected.
• Generator parameters are not matched to the bus
  Fix: If the generator and bus voltages, frequencies and phases are in sync, the lamps will light continuously. If not, the associated lamp will flash.
• Fault shutdown 21
• Fault alarm 22
• Engine overspeed indicator flashes, and the engine is shut down.
  Cause: The engine speed exceeds a certain threshold set in the GSC+.
  Fix: Correct the condition by addressing any issues that caused the engine to overspeed.
• Engine overspeed
  Cause: Engine speed exceeds the setpoint for engine overspeed that is programmed into the GSC+.
  Fix: The engine is shutdown and the engine is not allowed to start until the fault is corrected.
• Engine overcrank indicator flashes, and the engine is shut down.
  Cause: The engine has been cranked for an extended period without starting.
  Fix: Correct the condition by ensuring proper start-up procedures are followed.

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar 3512C ATAAC.

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

• Caterpillar 784B — Dump Truck
• Caterpillar 785B — Dump Truck
• Caterpillar 785D — Haul Truck

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.