Excavator Engine ECM Computer Board 478-7932 478-7933 262-2879 521-0791 for CAT C7 C9 C9.3B Controller

Engine control module for CAT C7 / C9 / C9.3B excavator decks - supplied against 478-7932, 478-7933, 262-2879 and the C9.3B 521-0791 reference. New board, anti-static packed, application verified from the ECM label and machine serial before shipment.

• Engine ECM / computer board for CAT C7, C9 and C9.3B excavator engine decks
• Covered numbers: 478-7932, 478-7933, 262-2879, with 521-0791 on the C9.3B reference line
• Replaces the engine control module that manages fueling, timing and engine protection
• Application checked against the ECM label, engine tag and machine serial
• Anti-static bag and export carton packaging
• Fully inspected before shipment

• C7 / C9 Engine Fuel Injectors
• Engine Sensor Kits (pressure, speed, temperature)
• Excavator Wiring Harnesses
• Monitor Panels and Display Boards
• Turbocharger Actuators
• Fuel Pump Assemblies

When an ECM fails, the machine does not limp - it stops, and the diagnosis usually ends at the control module. This engine computer board covers the C7, C9 and C9.3B decks that dominate 20-36 ton CAT excavator fleets, and it is supplied against the numbers the parts counter actually reads off the unit: 478-7932, 478-7933 and 262-2879, with 521-0791 on the C9.3B side. The critical discipline is the label match - the same physical module circulates under several numbers because it serves several engine builds, so the ECM label, the engine tag and the machine serial must agree before the order is confirmed. Anti-static packaging and pre-shipment inspection protect the board from the two failure modes that kill controllers: static discharge and freight damage.