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Overview

The Cat® C3.4B Industrial Diesel Engine is offered in ratings ranging from 45-55.4 bkW (60-74.3 bhp) @ 2200-2500 rpm. These C3.4B ratings meet U.S. EPA Tier 4 Final, EU Stage IIIB emission standards. The C3.4B also offers ratings ranging from 63-90 bkW (84.5-120.7 bhp) @ 2200-2500 rpm, which meet U.S. EPA Tier 4 Interim, EU Stage IIIB emission standards and are designed to 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

Units:
Minimum Power 60.3 bhp 45.0 bkW Less
Maximum Power 120.7 bhp 90.0 bkW Less
Frequency 2200 & 2500 rpm 2200 & 2500 rpm Less

Emission Standards

Emissions U.S. EPA Tier 4 Interim or U.S. EPA Tier 4 Final, EU Stage IIIB or EU Stage IV U.S. EPA Tier 4 Interim or U.S. EPA Tier 4 Final, EU Stage IIIB or EU Stage IV Less

General

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) or Turbocharged-Aftercooled (TA) Turbocharged (T) or Turbocharged-Aftercooled (TA) 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. Final dimensions dependent on selected options)

Length 747.5 mm (29.4 in) 747.5 mm (29.4 in) Less
Width 662 mm (26.1 in) 662 mm (26.1 in) Less
Height 822 mm (32.4 in) 822 mm (32.4 in) Less
Weight - Net Dry (Basic Operating Engine Without Optional Attachments) 251 kg (553.4 lb) 251 kg (553.4 lb) Less

Aftertreatment Dimensions (Approximate. Final dimensions dependent on selected options)

Length Wall Flow: 541 mm (21.3 in), Through Flow: 509 mm (20 in) (Tier 4 Interim or Tier 4 Final, Stage IIIB) Wall Flow: 541 mm (21.3 in), Through Flow: 509 mm (20 in) (Tier 4 Interim or Tier 4 Final, Stage IIIB) Less
Weight Wall Flow: 20 kg (44 lb), Through Flow: 14 kg (30.8 lb) (Tier 4 Interim or Tier 4 Final, Stage IIIB) Wall Flow: 20 kg (44 lb), Through Flow: 14 kg (30.8 lb) (Tier 4 Interim or Tier 4 Final, Stage IIIB) Less
Diameter Wall-Flow DPF: 180 mm (7.1 in). Through Flow: 149 mm (5.8 in) (Tier 4 Interim or Tier 4 Final, Stage IIIB) Wall-Flow DPF: 180 mm (7.1 in). Through Flow: 149 mm (5.8 in) (Tier 4 Interim or Tier 4 Final, Stage IIIB) Less
DOC Length 320 mm (12.6 in) (Tier 4 Final, Stage IV) 320 mm (12.6 in) (Tier 4 Final, Stage IV) Less
DOC Weight 15 kg (33 lb) (Tier 4 Final, Stage IV) 15 kg (33 lb) (Tier 4 Final, Stage IV) Less
DOC Diameter 196 mm (7.7 in) (Tier 4 Final, Stage IV) 196 mm (7.7 in) (Tier 4 Final, Stage IV) Less
SCR Weight 20 kg (44 lb) (Tier 4 Final, Stage IV) 20 kg (44 lb) (Tier 4 Final, Stage IV) Less
SCR Diameter 251 mm (9.88 in) (Tier 4 Final, Stage IV) 251 mm (9.88 in) (Tier 4 Final, Stage IV) Less
SCR Length 520 mm (20.47 in) (Tier 4 Final, Stage IV) 520 mm (20.47 in) (Tier 4 Final, Stage IV) Less

Emissions

Designed to meet U.S. EPA Tier 4 Interim or Tier 4 Final, EU Stage IIIB or Stage IV emission standards.

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.

Low Cost Maintenance

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

Quality

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

World-class Product Support Offered Through Global Cat Dealer Network

  • Scheduled maintenance, including S•O•SSM 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

Tier 4 Interim, Stage IIIB Aftertreatment Features


Regeneration. Wall Flow DPF: The transparent system allows the operator to run equipment without any loss in productive time, performance, or power during a continuous regeneration. No operator intervention is required unless the operator wants to prohibit the active regeneration.


Mounting. Multiple off- and on- engine installation options provide customers with simple and flexible solutions for many applications.
Service. Minimum 3000 hour DPF ash service intervals.

Tier 4 Final, Stage IIIB Aftertreatment Features


Regeneration. Through Flow and Wall Flow DPF. The transparent system allows the operator to run equipment without any loss in productive time, performance, or power during a continuous regeneration. No operator intervention is required unless the operator wants to prohibit the active regeneration.


Mounting. Multiple off- and on- engine installation options provide customers with simple and flexible solutions for many applications.
Service. Service-free through-flow DPF for the emissions life of the engine. Minimum 3000 hour DPF ash service intervals.

C3.4B Standard Equipment

Air Inlet System
  • Induction manifolds
  • Exhaust manifolds

Control System
  • Starter motor
  • Alternator
  • Electronic Control Unit
  • Sensors for:

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 and breathers

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

U.S. EPA Tier 4 Final, EU Stage IIIB Aftertreatment/Clean Emissions Control Equipment
  • For < 56 bkW (<75 bhp) ratings:
  • Diesel Particulate Filter (DPF)
  • Diesel Oxidation Catalyst (DOC)
  • Flex pipe connection kit with straight and 90° options for flexibility

U.S. EPA Tier 4 Interim, EU Stage IIIB Aftertreatment / Clean Emissions Control Equipment
  • For > 56 bkW (>75 bhp) ratings:
  • Clean Emissions Module (CEM), consisting of Diesel Particulate Filter (DPF) and Diesel Oxidation Catalyst (DOC)

U.S. EPA Tier 4 Final, EU Stage IV Aftertreatment/ Clean Emissions Control Equipment
  • For >56 bkW (>75 bhp) Ratings:
  • Diesel Oxidation Catalyst (DOC)
  • Selective Catalytic Reduction (SCR)

Cat® Dealer Service

Buy any piece of Cat® equipment and also get the full support and commitment of your local Cat Dealer.

Contact your local dealer
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