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

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

Air Inlet System

  • Standard air cleaners

Control System

  • Full electronic control system
  • Fully integrated, engine-mounted electronic control unit
  • Waterproof connectors and wiring looms
  • Flexible and configurable software features and J1939 standard communications I/O

Flywheels and Flywheel Housing

  • SAE3 configuration

Fuel System

  • Engine-mounted fuel filters
  • Electronic high pressure common rail fuel pump and injectors

Lube System

  • Lubricating oil filters and breathers


  • 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

  • Through Flow Diesel Particulate Filter (DPF)
  • Diesel Oxidation Catalyst (DOC)
  • Flex pipe connection kit with straight and 90° options for flexibility

Select Units


The Cat® C3.4B Industrial Power Unit is offered at 55.4 bkW (74.3 bhp) @ 2200 rpm, which meets U.S. EPA Tier 4 Final, EU Stage IIIB nonroad emission standards. Conveniently pre-configured for a wide range of applications, the Cat Industrial Power Unit is a complete power package containing a radiator, flywheel, alternator and alternator wiring completely pre-assembled for fast, straightforward installation in a number of OEM, customer and packager applications. These fuel efficient units are ready made for irrigation, industrial, mining and other pump applications.

Power Rating

  • Minimum Power 74.0 BHP 55.4 bkW
  • Maximum Power 74.0 BHP 55.4 bkW
  • Rated Speed 2200 2200

Emission Standards

  • Emissions Meets U.S. EPA Tier 4 Final, EU Stage IIIB nonroad standards Meets U.S. EPA Tier 4 Final, EU Stage IIIB nonroad standards


  • 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 Turbocharged
  • Compression Ratio 17:1 17:1
  • Rotation from Flywheel End Counterclockwise Counterclockwise

Power Unit Dimensions - Approximate

  • Height 957 mm (37.6 in) 957 mm (37.6 in)
  • Length 1242 mm (48.9 in) 1242 mm (48.9 in)
  • Weight - Approximate, Net Dry - Standard Configuration Without Oil, Cooling, Clutch, Compressor, A/C 359 kg (791.5 lb) 359 kg (791.5 lb)
  • Width 705 mm (27.7 in) 705 mm (27.7 in)

Aftertreatment Dimensions - Approximate

  • Diameter 149 mm (5.8 in) 149 mm (5.8 in)
  • Weight 509 mm (20 in) 509 mm (20 in)
  • Length 509 mm (20 in) 509 mm (20 in)


Ratings less than 55 bkW/74 bhp meet U.S. EPA Tier 4 Final, EU Stage IIIB nonroad emission standards.

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.

Low Cost Maintenance

Worldwide service delivers ease of maintenance and simplifies the servicing routine. Capable of optimal oil change intervals of 500 hours. Service-free through-flow diesel particulate filter (DPF) for Tier 4 Final, Stage IIIB. The S·O·S℠ program is available from your Cat dealer to determine oil change intervals and provide optimal performance.


Every Cat engine is manufactured to stringent quality standards in order to assure customer satisfaction.

Tier 4 Final, Stage IIIB Aftertreatment Features

Technology and Power. The Diesel Particulate Filter (DPF) technology chosen performs through the work cycle of the engine, allowing it to work efficiently. Engine performance has been optimized to provide maximum power, and the emissions module is invisible to the operator in most duty cycles. Mounting. Multiple off and on installation options provide customers with simple and flexible solutions for many applications. Service. Through-flow DPF is service-free for the emissions life of the engine.

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