Cat® C4.4 Industrial Power Unit

The C4.4 IPU engine is a common rail direct injection engine with either a single turbo or twin turbo chargecooled air system. It meets U.S. EPA Tier 4 Final, EU Stage V and Japan 2014 (Tier 4 Final) emission standards. For ease of installation, the IPU provides full aftertreatment mounting, an integrated cooling system and inlet air filter mounted to the IPU.

Reliable, Quiet and Durable Power

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

Exhaust System

Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), and Selective Catalytic Reduction (SCR) system supplied installed on engine. Zero downtime due to regeneration.

World-class Product Support Offered Through Global Cat Dealer Network

Superior dealer service network, Customer Support Agreements (CSA) and Cat® Extended Service Coverage (ESC).

Low-Cost Maintenance

Worldwide service delivers ease of maintenance and simplifies the servicing routine. Hydraulic tappets, multi-vee belts, service free DPF and 500-hour oil change intervals enable low-cost maintenance.

Documents & Brochures

Standard Equipment

Air Inlet System
  • Standard air cleaners
Control System
  • Full electronic control system, all connectors and wiring looms waterproof and designed to withstand harsh off-highway environments
  • Flexible and configurable software features and well-supported SAE J1939 CAN bus enables highly integrated machines
Cooling System
  • Top tank temperature 108° C (226° F) as standard to minimize cooling pack size
  • 50:50 water glycol mix
  • Guidance on cooling system design available through your dealer to ensure equipment reliability
Flywheels and Flywheel Housing
  • Wide choice of drivetrain interfaces, including SAE No. 2 and SAE No. 3 configurations
Fuel System
  • Electronic high pressure common rail
  • Innovative filter design to ensure maximum protection of the engine
Lube System
  • Wide choice of sumps for different applications
Power Take Off
  • SAE A and SAE B flanges on left-hand side. Additional SAE A flange available on left-hand side. Engine power can also be taken from the front of the engine on some applications. Factory fitted compressors are also available.
  • Available with or without a balancer
  • Paint: Caterpillar yellow, with optional colors available at request
  • Diesel Oxidation Catalyst (DOC) / Diesel Particulate Filter (DPF) / Selective Catalytic Reduction (SCR)
  • No ash service requirement
  • Passive regeneration

Additional information

Offering Type

Power Rating - Maximum Power

140 kW ( 188 HP )

Power Rating - Maximum Torque

815 Nm @ 1400 rpm ( 601 lb-ft @ 1400 rpm )

Power Rating - Rated Speed

2000 – 2200 rpm

Power Rating - Minimum Power

102 kW ( 137 HP )

Emission Standards - Emissions

EU Stage V, U.S. EPA Tier 4 Final, Japan 2014 (Tier 4 Final)

General - Engine Configuration

Inline 4, 4-Stroke-Cycle Diesel

General - Bore

105 mm ( 4.1 in )

General - Stroke

127 mm ( 5 in )

General - Displacement

4.4 l ( 268.5 in³ )

General - Compression Ratio


General - Aspiration

Turbocharged Aftercooled (TA) or Twin Turbocharged Aftercooled (TTA)

General - Rotation from Flywheel End


General - Aftertreatment


Power Unit Dimensions - Length

1532 mm ( 60.3 in )

Power Unit Dimensions - Width

869 mm ( 34.2 in )

Power Unit Dimensions - Height

1364 mm ( 53.7 in )

Power Unit Dimensions - Weight

707 kg ( 1559 lb )

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