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3126
Caterpillar

The Cat 3126 is a landmark 7.2L turbocharged inline-six diesel engine, celebrated for introducing electronic control to Caterpillar's mid-range lineup. Launched in the mid-1990s, it set a new standard for performance, versatility, and reliability in medium-duty applications. This engine is engineered to deliver robust power, superior fuel efficiency, and enduring durability across a vast spectrum of demanding on- and off-highway equipment.
The Cat 3126 engine is renowned for its extreme versatility, serving as the power source for a wide array of vehicles and machinery across multiple industries.
On-Highway Trucks & Vehicles: A popular choice for medium- and heavy-duty trucks from major manufacturers like Ford, Freightliner, International, Kenworth, Peterbilt, and Volvo. It also powers school buses, shuttle buses, RVs, fire trucks, and ambulances.
Construction & Earthmoving Equipment: Found in key Caterpillar machinery such as the 320 and 322 excavators, 938 and 950 wheel loaders, and D6 track-type tractors.
Industrial & Stationary Power: Reliably drives generators, air compressors, drilling rigs, and various industrial pumps.
Marine Applications: Used for propulsion and auxiliary power in workboats and vessels.
Pioneering Electronic Control: As Caterpillar's first electronically controlled mid-range diesel engine, the 3126 utilizes advanced engine management for precise fuel delivery and timing. This system optimizes performance, improves fuel economy, and provides enhanced diagnostic capabilities for easier troubleshooting.
Advanced HEUI Fuel System: Many models employ Caterpillar's Hydraulically Actuated Electronic Unit Injection (HEUI) system. This innovative technology uses engine oil pressure to achieve very high injection pressures, leading to superior fuel atomization, cleaner combustion, and consistent power output.
Proven Durability & Support: Built on a robust platform, the 3126 is designed for long service life. It is backed by a vast global parts and service network, with comprehensive support available including factory overhaul kits to extend its operational life reliably.

The Cat 3126 is a landmark 7.2L turbocharged inline-six diesel engine, celebrated for introducing electronic control to Caterpillar's mid-range lineup. Launched in the mid-1990s, it set a new standard for performance, versatility, and reliability in medium-duty applications. This engine is engineered to deliver robust power, superior fuel efficiency, and enduring durability across a vast spectrum of demanding on- and off-highway equipment.
The Cat 3126 engine is renowned for its extreme versatility, serving as the power source for a wide array of vehicles and machinery across multiple industries.
On-Highway Trucks & Vehicles: A popular choice for medium- and heavy-duty trucks from major manufacturers like Ford, Freightliner, International, Kenworth, Peterbilt, and Volvo. It also powers school buses, shuttle buses, RVs, fire trucks, and ambulances.
Construction & Earthmoving Equipment: Found in key Caterpillar machinery such as the 320 and 322 excavators, 938 and 950 wheel loaders, and D6 track-type tractors.
Industrial & Stationary Power: Reliably drives generators, air compressors, drilling rigs, and various industrial pumps.
Marine Applications: Used for propulsion and auxiliary power in workboats and vessels.
Pioneering Electronic Control: As Caterpillar's first electronically controlled mid-range diesel engine, the 3126 utilizes advanced engine management for precise fuel delivery and timing. This system optimizes performance, improves fuel economy, and provides enhanced diagnostic capabilities for easier troubleshooting.
Advanced HEUI Fuel System: Many models employ Caterpillar's Hydraulically Actuated Electronic Unit Injection (HEUI) system. This innovative technology uses engine oil pressure to achieve very high injection pressures, leading to superior fuel atomization, cleaner combustion, and consistent power output.
Proven Durability & Support: Built on a robust platform, the 3126 is designed for long service life. It is backed by a vast global parts and service network, with comprehensive support available including factory overhaul kits to extend its operational life reliably.
