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The Cat® C4.4 Naturally Aspirated (NA) Industrial Diesel Engine is offered in ratings ranging from 54-56 bkW (72.4-75 bhp) @ 2200 rpm. These ratings meet EU Stage IIIA equivalent emission standards. Turbocharged (T) and Turbocharged Aftercooled (TA) Ratings are also available, ranging from 55.5-83 bkW (74.4-111.3 bhp) @ 2200-2400 rpm. These ratings meet U.S. EPA Tier 3 equivalent, EU Stage IIIA equivalent emission standards. Industries and applications powered by C4.4 engines include: Agriculture, Aerial Lifts, Aircraft Ground Support, Bore/Drill Rigs, Chippers/Grinders, Compactors/Rollers, Compressors, Construction, Cranes, Crushers, Feller Bunchers, Forestry, Forklifts, General Industrial, Harvesters, Hydraulic Power Units, Irrigation Equipment, Loaders/Forwarders, Material Handling, Mining, Mobile Earthmoving Equipment, Mobile Sweepers, Paving Equipment, Pumps, Skidders, Specialty Ag Equipment, Sprayers, Trenchers, Turf and Landscaping and Underground Mining Equipment.

Cat Specs


105 mm (4.13 in)
127 mm (5.0 in)
4.4 L (269 in³)
Combustion System
Direct Injection
Compression Ratio
Rotation from Flywheel End
Lube System - Refill
11 L (11.6 qt)
Engine Configuration
Inline 4, 4-Stroke-Cycle Diesel
Naturally Aspirated (NA), Turbocharged (T) or Turbocharged Aftercooled (TA)

Emission Standards

EU Stage IIIA Equivalent (NA). U.S. EPA Tier 3 Equivalent, EU Stage IIIA Equivalent (T, TA)

Power Rating

Minimum Power
72.4 BHP
Maximum Power
111.3 BHP
Rated Speed
2200-2400 rpm

Engine Dimensions - Approximate

663 mm (26.1 in)
470-620 mm (18.5-24.4 in)
775-810 mm (30.5-31.9 in)
Weight - Net Dry - Basic Operating Engine Without Optional Attachments
291-306 kg (640-674.6 lb)