Caterpillar 3406C Engine Engine

This engine also powers 23 machine(s) on Power Equipment Info.

• Fault shutdown 21
• Fault alarm 22
• Engine overspeed i01226491
  Fix: Stop the engine by shutting off the fuel supply to the engine and/or shutting off the air supply to the engine.
• SMCS Code: 1000 i01197515
  Fix: • Check the crankcase oil level. Maintain the oil level between the “ADD” mark and the “FULL” mark on the oil level gauge. • If necessary, perform minor adjustments. Repair any leaks and tighten any loose bolts. • Note the service hour meter reading. Perform the maintenance that is in the Operation and Maintenance Manual, “Maintenance Interval Schedule”.
• Low power or poor performance in the winter i01190421
  Fix: Before troubleshooting for low power or for poor performance in the winter, check the type of fuel that is being used. When No. 2 diesel fuel is used the following components provide a means of minimizing problems in cold weather: • Starting aids • Engine oil pan heaters • Engine coolant heaters • Fuel heaters • Fuel line insulation
• Low oil pressure or no oil pressure is indicated
  Fix: Stop the engine and determine the cause of the problem. Refer to Troubleshooting for further information or consult with your Caterpillar dealer.
• High exhaust temperatures Power loss Excessive fan usage Reduction in fuel economy
  Cause: Airflow restriction can cause these conditions.
  Fix: If an airflow restriction device must be used, the device should have a permanent opening directly in line with the fan hub. The device must have a minimum opening dimension of at least 770 cm2 (120 in2). A centered opening that is directly in line with the fan hub is specified in order to prevent an interrupted airflow on the fan blades. Interrupted airflow on the fan blades could cause a fan failure. Caterpillar recommends a warning device for the inlet manifold temperature and/or the installation of an inlet air temperature gauge. The warning device for the inlet manifold temperature should be set at 65°C (150°F). The inlet manifold air temperature should not exceed 65°C (150°F). Temperatures that exceed this limit can cause power loss and potential engine damage.
• Gauge readings that change even if the readings are within specifications
  Cause: Significant change in the readings
  Fix: Determine the cause of any significant change in the readings, and/or correct the cause of any significant change in the readings. Consult your Caterpillar dealer for assistance.
• Engine operating above the normal range and steam becomes apparent.
  Fix: 1. Reduce the load and the engine speed (rpm). 2. Inspect the cooling system for leaks. 3. Determine if the engine must be shut down immediately or if the engine can be cooled by reducing the load.
• Engine operating above the normal range and steam becomes apparent
  Fix: Reduce the load and the engine speed (rpm). Inspect the cooling system for leaks. Determine if the engine must be shut down immediately or if the engine can be cooled by reducing the load.
• Decrease in fuel pressure.
  Fix: A decrease in fuel pressure usually indicates a plugged fuel filter.
• Decrease in fuel pressure
  Fix: A decrease in fuel pressure usually indicates a plugged fuel filter.
• A lower oil pressure is normal at low idle.
  Fix: If the load is stable and the gauge reading changes, perform the following procedure: 1. Remove the load. 2. Reduce engine speed to low idle. 3. Check and maintain the oil level.

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar 3406C.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

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

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

• Air filter: Caterpillar 612506 Donaldson P532506 Wix 46589 Ac Delco A1586C
• Oil filter: Caterpillar 3890434 Caterpillar 2P4005 Donaldson P551808 Donaldson P554005 Wix 57792 Wix 51792 Ac Delco PF879L

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

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• Caterpillar RR250B — Road Stabilizer
• Caterpillar SS250B — Road Stabilizer
• Driltech D40K — Drilling Equipment
• Ford CL-9000 — Truck
• Ford CLT-9000 — 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.