Yesterday, 11:55 AM
Sullair Legacy and Corporate Roots
Founded in 1965 in Michigan City, Indiana, Sullair established itself as a front-runner by introducing rotary-screw air-compressor technology to the U.S. domestic market . Within a few years, the company expanded its offerings beyond its first portable compressor (shipped in 1966), incorporating stationary units, building rotors for its screw compressors, and pioneering synthetic fluids and oil-free models . Now under Hitachi ownership since its US$1.245 billion acquisition in 2017, Sullair continues innovating across portable, stationary, and OEM air systems .
Celebrating six decades of manufacturing in Michigan City, Sullair recently held a community-focused anniversary event in August 2025, underscoring its industrial heritage and local roots .
Evolution of the 375 Series Compressor
The 375 Series emerged as a successor to the original 300 cfm portable compressors, offering improved airflow and greater adaptability for industrial and rental applications . The tier-compliant models—375 iT4—deliver 300-425 cfm and operate across a wide pressure range of 100-500 psig. They are designed for versatility, including towable and multi-axle configurations, and are manufactured in ISO 9001–certified facilities .
CAT Engine Integration and Technical Enhancements
As part of a longstanding collaboration, Sullair equips many 375 models with Caterpillar C4.4 industrial diesel engines. These engines provide up to 150 kW (200 hp) and 825 Nm (609 lb-ft) of torque while meeting stringent EPA Tier 4 Final and EU Stage V emissions standards . Compared with earlier engine platforms, the C4.4 achieves up to 20 % lower fuel consumption and reduces DEF (Diesel Exhaust Fluid) usage by approximately 3 %, significantly lowering operating costs . Compact in design, the C4.4 also delivers a 20 % reduction in length, 5 % reduction in height, and 40 % reduction in weight—facilitating easier installation and packaging .
Design Improvements for Serviceability and Safety
Engineers placed service points strategically for easy access: gull-wing side doors and swing-open end panels allow technicians to reach engine oil filters, air filters, dipsticks, batteries, and cooling systems with minimal effort . Caterpillar’s feedback played a pivotal role in relocating control panels and service access to the curb side—eliminating roadside hazards and enhancing operator safety .
To meet Tier 4 Final standards, the C4.4 engine incorporates DOC (Diesel Oxidation Catalyst) and SCR (Selective Catalytic Reduction) systems . To prevent operator errors, DEF tanks are clearly color-coded and positioned opposite the diesel fill cap to avoid misfuelling .
Alternative Engine Option
In 2019, Sullair expanded the 375 lineup with a Perkins-powered 375H Tier 4 Final model, featuring a Perkins 1204F-E44 4-cylinder engine rated at 122 hp. This model includes a 65-gallon fuel tank for up to 10 hours runtime at full load and retains the 375 cfm output at 150 psig . The addition of Perkins engines offers customers flexibility depending on regional service networks and preferences.
Technical Specifications Overview
Here are key performance specs of the Sullair 375 models:
Operators and rental users appreciate the curb-side service layout for enhanced safety, while the compact chassis keeps the compressor towable even behind light-duty trucks . Maintenance accessibility, combined with reliable Cat and Perkins engine options, supports uptime and keeps lifecycle costs manageable .
Summary Insights
The Sullair 375 series—whether outfitted with Caterpillar C4.4, Perkins, or John Deere engines—balances performance, regulatory compliance, and maintenance convenience. Its roots in decades of innovation, global manufacturing footprints, and user-informed design continue to reinforce Sullair’s reputation in the compressed-air industry.
Founded in 1965 in Michigan City, Indiana, Sullair established itself as a front-runner by introducing rotary-screw air-compressor technology to the U.S. domestic market . Within a few years, the company expanded its offerings beyond its first portable compressor (shipped in 1966), incorporating stationary units, building rotors for its screw compressors, and pioneering synthetic fluids and oil-free models . Now under Hitachi ownership since its US$1.245 billion acquisition in 2017, Sullair continues innovating across portable, stationary, and OEM air systems .
Celebrating six decades of manufacturing in Michigan City, Sullair recently held a community-focused anniversary event in August 2025, underscoring its industrial heritage and local roots .
Evolution of the 375 Series Compressor
The 375 Series emerged as a successor to the original 300 cfm portable compressors, offering improved airflow and greater adaptability for industrial and rental applications . The tier-compliant models—375 iT4—deliver 300-425 cfm and operate across a wide pressure range of 100-500 psig. They are designed for versatility, including towable and multi-axle configurations, and are manufactured in ISO 9001–certified facilities .
CAT Engine Integration and Technical Enhancements
As part of a longstanding collaboration, Sullair equips many 375 models with Caterpillar C4.4 industrial diesel engines. These engines provide up to 150 kW (200 hp) and 825 Nm (609 lb-ft) of torque while meeting stringent EPA Tier 4 Final and EU Stage V emissions standards . Compared with earlier engine platforms, the C4.4 achieves up to 20 % lower fuel consumption and reduces DEF (Diesel Exhaust Fluid) usage by approximately 3 %, significantly lowering operating costs . Compact in design, the C4.4 also delivers a 20 % reduction in length, 5 % reduction in height, and 40 % reduction in weight—facilitating easier installation and packaging .
Design Improvements for Serviceability and Safety
Engineers placed service points strategically for easy access: gull-wing side doors and swing-open end panels allow technicians to reach engine oil filters, air filters, dipsticks, batteries, and cooling systems with minimal effort . Caterpillar’s feedback played a pivotal role in relocating control panels and service access to the curb side—eliminating roadside hazards and enhancing operator safety .
To meet Tier 4 Final standards, the C4.4 engine incorporates DOC (Diesel Oxidation Catalyst) and SCR (Selective Catalytic Reduction) systems . To prevent operator errors, DEF tanks are clearly color-coded and positioned opposite the diesel fill cap to avoid misfuelling .
Alternative Engine Option
In 2019, Sullair expanded the 375 lineup with a Perkins-powered 375H Tier 4 Final model, featuring a Perkins 1204F-E44 4-cylinder engine rated at 122 hp. This model includes a 65-gallon fuel tank for up to 10 hours runtime at full load and retains the 375 cfm output at 150 psig . The addition of Perkins engines offers customers flexibility depending on regional service networks and preferences.
Technical Specifications Overview
Here are key performance specs of the Sullair 375 models:
- Airflow: 300–425 cfm
- Pressure Ratings: 100–500 psig
- C4.4 Engine Output: Up to 150 kW (200 hp), 825 Nm torque
- 375HH (John Deere option): 375 cfm at 200 psig, approx. 140 bhp, weight ~2,000 kg, noise level ≈ 76 dBA @ 7 m
- Fuel Runtime for Perkins 375H: Up to 10 hours at full load via oversized tank
Operators and rental users appreciate the curb-side service layout for enhanced safety, while the compact chassis keeps the compressor towable even behind light-duty trucks . Maintenance accessibility, combined with reliable Cat and Perkins engine options, supports uptime and keeps lifecycle costs manageable .
Summary Insights
The Sullair 375 series—whether outfitted with Caterpillar C4.4, Perkins, or John Deere engines—balances performance, regulatory compliance, and maintenance convenience. Its roots in decades of innovation, global manufacturing footprints, and user-informed design continue to reinforce Sullair’s reputation in the compressed-air industry.
