C3.4B, Less 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 45-55.4 bkW (60-74.3 bhp) @ 2200-2500 rpm, which meet U.S. EPA Tier 4 Final, EU Stage IIIB 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 60.3 BHP 45.0 bkW Less
Maximum Power 74.3 BHP 55.4 bkW Less
Rated Speed 2200 & 2500 rpm 2200 & 2500 rpm Less

Emission Standards

Emissions U.S. EPA Tier 4 Final, EU Stage IIIB Nonroad Emission Standards U.S. EPA Tier 4 Final, EU Stage IIIB Nonroad Emission Standards Less


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

Engine Dimensions - Approximate

Height 829.5 mm (32.6 in) 829.5 mm (32.6 in) Less
Length 610 mm (24 in) 610 mm (24 in) Less
Weight - Net Dry - Basic Operating Engine Without Optional Attachments 251 kg (553.4 lb) 251 kg (553.4 lb) Less
Width 653 mm (25.7 in) 653 mm (25.7 in) Less

Aftertreatment Dimensions - Approximate

Diameter Wall-Flow: 180 mm (7.1 in). Through Flow: 149 mm (5.8 in) Wall-Flow: 180 mm (7.1 in). Through Flow: 149 mm (5.8 in) Less
Length Wall Flow: 541 mm (21.3 in). Through Flow: 509 mm (20 in) Wall Flow: 541 mm (21.3 in). Through Flow: 509 mm (20 in) Less
Weight Wall Flow: 20 kg (44 lb). Through Flow: 14 kg (30.8 lb) Wall Flow: 20 kg (44 lb). Through Flow: 14 kg (30.8 lb) Less

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, Less 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 IIIB Aftertreatment/Clean Emissions Control Equipment
  • Diesel Particulate Filter (DPF)
  • Diesel Oxidation Catalyst (DOC)
  • Flex pipe connection kit with straight and 90° options for flexibility