C3.4B, Greater than 56 kW (75 hp)

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Cat® C3.4B Industrial Diesel Engines offer the perfect balance of durability, fuel efficiency and low emissions. The C3.4B Industrial Engine is offered in ratings ranging from 63-90 bkW (84.5-120.7 bhp) @ 2200-2500 rpm, which meet U.S. EPA Tier 4 Final, EU Stage IV emission standards. Industries and applications powered by C3.4B engines include: Agriculture, Aerial Lifts, Aircraft Ground Support, Bore/Drill Rigs, Chippers/Grinders, Compactors/Rollers, Compressors, Construction, Forestry, General Industrial, Irrigation Equipment, Material Handling, Mining, Mobile Earthmoving Equipment, Mobile Light Towers, Mobile Sweepers, Paving Equipment, Pumps, Specialty Ag Equipment, Trenchers, Turf and Landscaping and Underground Mining Equipment.

Power Rating

  • Minimum Power 84.5 BHP 63.0 bkW
  • Maximum Power 121.0 BHP 90.0 bkW
  • Rated Speed 2200 & 2500 rpm 2200 & 2500 rpm

Emission Standards

  • Emissions U.S. EPA Tier 4 Final, EU Stage IV Nonroad Emission Standards. U.S. EPA Tier 4 Interim Equivalent and EU Stage IIIB Equivalent ratings available using EPA or EU Flex Provisions. U.S. EPA Tier 4 Final, EU Stage IV Nonroad Emission Standards. U.S. EPA Tier 4 Interim Equivalent and EU Stage IIIB Equivalent ratings available using EPA or EU Flex Provisions.


  • Engine Configuration In-Line 4, 4-Stroke-Cycle Diesel In-Line 4, 4-Stroke-Cycle Diesel
  • Bore 99 mm (3.9 in) 99 mm (3.9 in)
  • Stroke 110 mm (4.3 in) 110 mm (4.3 in)
  • Displacement 3.4 L (207.5 in³) 3.4 L (207.5 in³)
  • Aspiration Turbocharged-Aftercooled (TA) Turbocharged-Aftercooled (TA)
  • Compression Ratio 17:1 17:1
  • Combustion System Direct Injection Direct Injection
  • Rotation from Flywheel End Counterclockwise Counterclockwise
  • Cooling System - Capacity 6 L (6.3 qt) 6 L (6.3 qt)

Aftertreatment Dimensions - Approximate

  • DOC Diameter 196 mm (7.7 in) 196 mm (7.7 in)
  • DOC Length 320 mm (12.6 in) 320 mm (12.6 in)
  • DOC Weight 15 kg (33 lb) 15 kg (33 lb)
  • SCR Diameter 251 mm (9.88 in) 251 mm (9.88 in)
  • SCR Length 520 mm (20.47 in) 520 mm (20.47 in)
  • SCR Weight 20 kg (44 lb) 20 kg (44 lb)

Engine Dimensions - Approximate

  • Dry Weight - Basic Operating Engine Without Optional Attachments 270 kg (595.2 lbs) 270 kg (595.2 lbs)
  • Height 805.5 mm (31.7 in) 805.5 mm (31.7 in)
  • Length 610 mm (24 in) 610 mm (24 in)
  • Width 623 mm (24.5 in) 623 mm (24.5 in)

Reliable, Quiet and Durable Power

World-class manufacturing capability and processes coupled with proven core engine designs assure reliability, quiet operation, and many hours of productive life.

High Performance

Leading-edge technology provides significant improvements in power, torque, fuel consumption and response. Technology includes single smart wastegated turbo systems, durable high pressure common rail technology, and closed circuit breathing system.

Fuel Efficiency

Fuel consumption optimized to match operating cycles of a wide range of equipment and applications while maintaining low operating costs.

Fuel & Oil

Tier 4 Interim or Tier 4 Final, Stage IIIB or Stage IV engines require Ultra Low Sulfur Diesel (ULSD) fuel containing a maximum of 15 ppm sulfur, and new oil formulations to support the new technology. Cat engines are designed to accommodate B20 biofuel. Your Cat dealer can provide more information regarding fuel and oil.

Broad Application Range

Industry leading range of factory configurable ratings and options for agricultural, material handling, construction, mining, aircraft ground support, and other industrial applications.

C3.4B, Greater than 56 kW (75 hp) Standard Equipment

Air Inlet System

  • Induction manifolds
  • Exhaust manifolds

Control System

  • Starter motor
  • Alternator
  • Electronic Control Unit
  • Sensors for: engine speed, oil pressure, and coolant temperature

Cooling System

  • Cooling packs

Flywheels and Flywheel Housing

  • Flywheel housings
  • Flywheel and starter rings

Fuel System

  • Fuel filter positions
  • Common rail fuel pump and injectors

Lube System

  • Lubricating oil filters


  • Cold start capability to -20° C (-4° F)
  • Paint: Caterpillar yellow, with optional colors available at request

U.S. EPA Tier 4 Final, EU Stage IV Aftertreatment/ Clean Emissions Control Equipment

  • Diesel Oxidation Catalyst (DOC)
  • Selective Catalytic Reduction (SCR)
  • SCR Auxiliaries

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