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

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Maximum Power74 HP (55.4 kW)
Maximum Torque234.5 lb-ft @ 1600 rpm (318 Nm @ 1600 rpm)
EmissionsU.S. EPA Tier 4 Final
Rated Speed2200
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.


Maximum Power74 HP (55.4 kW)
Maximum Torque234.5 lb-ft @ 1600 rpm (318 Nm @ 1600 rpm)
EmissionsU.S. EPA Tier 4 Final
Rated Speed2200
Minimum Power74 HP (55.4 kW)
Engine ConfigurationIn-Line 4, 4-Stroke-Cycle Diesel
Bore3.9 in (99 mm)
Stroke4.3 in (110 mm)
Displacement207.5 in³ (3.4 l)
Compression Ratio17.0:1
Rotation from Flywheel EndCounterclockwise
Length48.9 in (1242 mm)
Width27.7 in (705 mm)
Height37.6 in (957 mm)
Weight792 lb (359 kg)
Length20 in (509 mm)
Diameter5.8 in (149 mm)

Benefits and Features

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

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

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.

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

  • Scheduled maintenance, including SOS℠ sample
  • Customer Support Agreements (CSA)
  • Caterpillar Extended Service Coverage (ESC)
  • Superior dealer service network
  • Extended dealer service network through the Cat Industrial Service Distributor (ISD) program

Standard Equipment

  • Standard air cleaners
  • 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
  • Engine-mounted fuel filters
  • Electronic high pressure common rail fuel pump and injectors
  • Lubricating oil filters and breathers
  • Cold start capability to -20° C (-4° F)
  • Paint: Caterpillar yellow, with optional colors available at request
  • Through Flow Diesel Particulate Filter (DPF)
  • Diesel Oxidation Catalyst (DOC)
  • Flex pipe connection kit with straight and 90° options for flexibility