Precision Dual-Cylinder Performance, Built and Tested In-House

The Cummins X15 “3689770RX” Twin Air Compressor represents the latest generation of heavy-duty, dual-piston Bendix engineering — a water-cooled, gear-driven, two-cylinder powerhouse that supplies the air systems behind today’s most demanding Class 8 trucks.

Designed for the Cummins X15 EPA17-compliant engine platform (2017–Present), this compressor delivers reliable air volume for braking, suspension, and auxiliary systems in modern Freightliner, Peterbilt, Kenworth, and International trucks. Built on the Bendix BA-922 Twin Series, it’s engineered to sustain long duty cycles, optimized cooling, and smooth delivery even under extreme thermal and load conditions.

At Turbo Kings, every 3689770RX compressor undergoes a complete remanufacturing process that mirrors OEM production. Each unit is fully disassembled, media-cleaned, ultrasonically flushed, machined, and reassembled using only OEM-grade seals, bearings, and valve components. This isn’t a quick reseal — it’s a precision rebuild held to the same testing parameters Bendix uses on their production line.

After reassembly, each compressor is bench-tested under pressure to validate oil control, airflow stability, and cut-out response. Units must pass leak-down and compression standards before leaving the facility. Both air and coolant passages are ultrasonically cleaned to ensure unrestricted circulation — eliminating carbon, scale, and oil residue that could compromise performance or cooling efficiency.

Turbo Kings Rebuild Highlights

• True Dual-Cylinder Configuration – Provides higher sustained air volume and smoother duty cycling for modern air systems.
• Ultrasonic Cleaning Process – Internal air and coolant passages are fully flushed and cleared of deposits for optimal flow.
• OEM-Spec Component Replacement – Pistons, rods, bearings, and valves replaced or machined to Bendix precision tolerances.
• Machined & Decked Surfaces – Critical sealing areas are resurfaced to prevent oil seepage or compression loss.
• Bench-Tested at Working Pressure – Each compressor is dynamically verified under simulated operating loads.
• 12-Month Unlimited-Mileage Warranty – Every unit is backed by a no-nonsense Turbo Kings warranty for reliability you can trust.

Specifications

• Manufacturer: Bendix

• OEM Part Number: 3689770RX (Cummins cross)

• Series: BA-922 Twin / Dual Cylinder

• Cooling Type: Water-cooled

• Drive Type: Gear-driven

• Displacement: ≈ 17.5 CFM @ 1250 RPM (combined output)

• Mounting: Direct block-mount on Cummins X15 engines

• Applications: Freightliner Cascadia, Peterbilt 579, Kenworth T680, International LT Series (2017–Present)

Applications

Compatible with:

• Cummins X15 (EPA17–EPA21) – 2017–Present

• Freightliner, Peterbilt, Kenworth, and International equipped with Cummins X15 power units