C4.4 HazPak

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When the job takes you into a hazardous location, Cat® HazPak engines are ready. Our complete range of services and engine packages cover both industry standards and your operation with maximum safety. Cat C4.4 HazPaks are hazardous location power units that are the ideal solution for specialized and demanding operations in the oilfield. Units are hazardous-location certified from the factory to minimize installation design, time, and cost. HazPaks are certified to operate in potentially explosive environments. Cat hazpaks are backed by the worldwide network of Cat dealers ready to support your operation with technical support, service, parts, and warranty. Cat C4.4 HazPak. Rating: 39-112 bkW (52-151 bhp) @ 1500-2200 rpm.

Package Specifications

  • Minimum Rating 52.0 BHP 39.0 bkW
  • Maximum Rating 151.0 BHP 112.0 bkW
  • Peak Torque - Speed 273 N•m (201 lb-ft) @ 1500 rpm 273 N•m (201 lb-ft) @ 1500 rpm
  • Displacement 265.5 in³ 4.4 l
  • Aspiration Naturally aspirated or turbocharged-aftercooled Naturally aspirated or turbocharged-aftercooled
  • Governor and Protection Woodward Woodward
  • Weight - Net Dry - Approximate 2138.0 lb 970.0 kg
  • Oil Change Interval 500 500
  • Rotation from Flywheel End Counterclockwise Counterclockwise
  • Flywheel and Flywheel Housing SAE 3 SAE 3
  • Stroke 5.0 in 127.0 mm
  • Bore 4.13 in 105.0 mm
  • Emissions U.S. EPA Marine Tier 2, CCNR Stage 2 U.S. EPA Marine Tier 2, CCNR Stage 2

Capacity for Liquids

  • Lube Oil System - Refill 7.4 qt (US) 7.0 l
  • Cooling System 26.0 qt (US) 24.6 l

Making Your Investment Work Harder

• Factory-certified package for hazardous location applications allow simplified rig certification for OEM • Maintains high power over broad range of operating speeds, improving performance • Steady torque rise provides superior load acceptance • Optimized ambient and altitude capabilities for operating flexibility

Committed to Sustainable Development

• Meets today's emission standards for well service applications - CCNR Stage 2/U.S.A. 40 CFR Part 94 Marine Tier 2

Driving Down Total Cost of Ownership

• Improved serviceability versus the competition • Industry-leading component overhaul life • Rugged Caterpillar testing on all components improves uptime

Product Support Offered Through Global Cat Dealer

• More than 2,200 dealer outlets • Caterpillar factory-trained dealer technicians service every aspect of your petroleum package • Caterpillar parts and labor warranty

Web Site

For all your petroleum power requirements, visit

Web Site

For all your petroleum power requirements, visit

C4.4 HazPak Standard Equipment

Air Inlet System

  • ATEX designed and tested inlet system, compliant to EN 1834-1; stainless steel flame arrestor; integrated air shutdown valve, activates on overspeed and emergency stop; available in hydraulic, pneumatic, electric configurations; air cleaner, single element canister type with service indicator and rain cap; dry aluminum compressor housing

Cooling System

  • Closed cooling system with air blast radiator and charge air cooling, marine radiator with full solderdipped core, radiator cooled packages sized for 45°C ambient air temp, gear-driven centrifugal jacket water pump, de-aeration expansion tank, exhaust gas heat exchanger (cooler), additional heat load from exhaust heat exchanger included in cooling circuit

Exhaust System

  • ATEX designed and tested exhaust system, compliant to EN 1834-1; comprised of exhaust gas heat exchanger (cooler); stainless steel flame arrestor; stainless steel spark arrestor; water-cooled exhaust manifold, watercooled turbocharger

Fuel System

  • Mechanical fuel injection, primary fuel filter/water separator with 1/4” BSPP connectors (LH), secondary fuel filter (LH), fuel priming pump manual, fuel shutoff valve


  • Package ambient capability is -20°C to 45°C; mechanical systems are designed for Gas Group IIA; electrical systems are designed for Gas Group IIC; all systems meet temperature class T3 (200°C limit); includes a declaration of conformity for the entire package scope; radiator package, engine, and exhaust system fitted to sub-frame; air filter, fuel/water separator, remote oil filter installed and mounted; earth bonding per standard EN 60079-14

Lube System

  • Oil filter (LH), dipstick (LH), fs disposal (closed system)

C4.4 HazPak Optional Equipment

Air Compressor

  • Single cylinder, 225 CC with head unloader

Charging System

  • 12V, 45A alternator with 75AH battery pack
  • 24V 16A alternator with 75AH battery pack
  • 24V 25A alternator with 75AH battery pack

Control System

  • Local panel at side of engine, includes: coolant temperature gauge, lube oil pressure gauge, exhaust gas temperature gauge, exhaust gas backpressure gauge, engine speed gauge, stop switch

Exhaust System

  • 18 dBA spark arrestor/muffler, ATEX approved

Fuel System

  • Fuel cooler, installed, maintains acceptable fuel temperature when running from day tank

Starting System

  • Air, electric, and hydraulic starters available

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