Product Description
9125400040X – 85MM TWIN CYLINDER “CERTIFIED REMANUFACTURED” AIR BRAKE COMPRESSOR (ISX 270 FLANGE)
PART NUMBER(S):
Fleet Products: 9125400040X (Remanufactured) | OE: 3689770, 3687356, 3681904
DESCRIPTION:
Model: Twin Cylinder – WABCO/Cummins
Vehicles: Cummins ISX / QSX Engines
• Mounting Type: Flange Mount (ISX 270)
• Piston Diameter: 85.0 mm
• Stroke: 56 mm
• Displacement: 636 cm³
• Configuration: Twin Cylinder
• Cooling Method: Water-cooled
• Operating Speed: Up to 3,000 RPM
• Max Operating Pressure: 10.0 bar / 145 psi
• Crankshaft Thread: M20 x 1.5
• Lubrication: Supplied by engine
• Port Threads: Ø 31.8, M27 x 2.0, M10 x 1.0, Ø 8 mm, M18 x 1.5 (x3)
Applications:
Engineered for Cummins ISX platforms requiring the ISX 270 flange, this high-performance twin-cylinder air brake compressor delivers consistent, durable airflow. Ideal for commercial fleet, long-haul trucking, and vocational heavy-duty vehicle environments.
CROSS-REFERENCE(S):
09254073076, 3686475, 3686476, 3686476RX, 3687356, 3687356NX, 3687356RX, 3689770, 3689770CUM, 3689770RX, 5663565, 5663565RX, 707115AT, 912540040, A2C53354791Z, 9115150200X, 9115150200, 3681904, 3681902, 3103413, MX9115150200X
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ For use only with Cummins ISX engines using ISX 270 flange
✔ Flush coolant and air lines before installation
✔ Confirm crankshaft thread compatibility (M20 x 1.5)
✔ Match all port sizes and routing to vehicle spec
✔ Torque all ports and fasteners to OE standards
SOLD AS REMANUFACTURED – CORE RETURN REQUIRED
Built to OEM standards — thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, call 1-877-243-0442 or email sales@fleet-products.com
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