Holset ST676 Cummins Air Compressor
The Holset ST676 Cummins Air Compressor is a high-displacement, 30 CFM twin-cylinder compressor engineered for Cummins-powered logging equipment. Designed to meet the extreme pneumatic demands of tower haulers and yarders. Features a robust water-cooled head for superior thermal management during sustained uphill pulls and a spline-drive configuration for direct engine integration. Primarily used on Cummins L10, M11, and N14 engine platforms.
30 CFM Super Twin Power: Holset ST676 for High-Lead Yarders
In the rugged New Zealand forestry environment, air system reliability is the difference between a productive day and a safety disaster. The Holset ST676 (Cummins 3048680X) is one of the highest-displacement compressors in its class, delivering a massive 30 CFM at 1250 RPM. This volume is essential for operating the large-diameter brake cans and multi-plate pneumatic clutches found on heavy yarders like the Madill 171 or Thunderbird TMY series.
Equipped with a 3-prong thru-drive spline, the ST676 allows for the direct mounting of secondary hydraulic or power steering pumps—a common requirement in custom hauler builds. Its water-cooled head prevents overheating during sustained uphill pulls or stationary idling on hot landings. By installing a genuine Holset Super Twin, you ensure your air tanks are replenished almost instantly after repeated braking, maintaining the constant line tension needed for safe cable logging.
Maintenance & Compatibility
This unit replaces various OEM Cummins and Holset part numbers, including 3048680, 3048676, and 3558027. When installing in a forestry application, ensure all coolant lines are clear of debris to maintain the high duty-cycle performance required for yarding.
Technical Specifications
| Feature | Specification |
| Model Number | Holset ST676 (Super Twin) |
| OEM Part Number | 3048680X (Reman) / 3048676 |
| Rated Displacement | 30 CFM @ 1250 RPM |
| Number of Cylinders | 2 (Twin Cylinder) |
| Cooling Method | Water-Cooled (Head and Block) |
| Drive Configuration | Spline Drive (with 3-prong thru-drive) |
| Weight | Approx. 34.8 kg (76.7 lbs) |
| Engine Fitment | Cummins L10, M11, N14, K-Series |
Tower Hauler & Mobile Yarder Applications
The Holset ST676 is the primary air supply for heavy-duty Cummins L10, M11, and N14 engine platforms used in the NZ forestry sector. It is a critical replacement part for Madill 171, Thunderbird TMY, and Brightwater yarders where high-volume air is non-negotiable for drum control. Its cast-iron durability is designed to withstand the high vibration and intense duty cycles of high-lead and skyline logging operations across the North and South Islands.
