Description
CUMMINS ISX / X15 ENGINE AIR COMPRESSOR 85MM SINGLE CYLINDER
PART NUMBER(S):
Fleet Products: 9121400520X (Remanufactured) | Replaces OE: WABCO: 9121400520, 9121400120, 9121400520R, 9121400527, 9121400530 | Cummins: 5273898, 5558790, 4337585, 5633492, 5633492RX
DESCRIPTION:
Model: WABCO 9121400520 85MM Single-Cylinder Air Compressor, 35 Teeth Gear Drive
Vehicles: Cummins ISX12, ISX15, X15, QSX engines, 2010–2025
• Bore: 85 mm
• Stroke: 56 mm
• Swept volume: 318 cm³
• Maximum operating pressure: 10.0 bar
• Operating speed: 3000 RPM
• Lubrication: Supplied from engine
• Inlet port: M30 x 1.5
• Discharge port: M26 x 1.5
• Governor port: M10 x 1.0
• Drain port: 1/8"-27 NPTF
• Coolant port: M16 x 1.5
• Gear drive: 35 teeth
• Type: Single cylinder
Applications: Designed for Cummins ISX12, ISX15, X15, and QSX engine applications from 2010–2025 requiring an 85 mm WABCO single-cylinder air compressor. This compressor supports air delivery for braking and auxiliary air systems in long-haul and vocational fleet applications.
NOTE: THIS COMPRESSOR COMES WITH 35 TEETH GEAR. 9111530270X and 9111530197X has 31 Teeth Gear.
CROSS-REFERENCE(S):
5558790, 9121400520, 9121400120, 5273898, 81600560, 2T2100759B, 3999917, 701497AT, KGM55450, 4337585, 5633492RX, 5633492, 9121400520R, 9121400527, 9121400530
A cross-reference listing means this part may be a suitable replacement for the listed part numbers. Always verify fitment before installation.
IMPORTANT INSTALLATION NOTES:
✔ Prime the lubrication system before initial start-up to prevent dry start damage
✔ Verify port thread sizes and coolant connections match engine configuration before mounting
✔ Torque mounting bolts to manufacturer specification and check for air and coolant leaks after installation
✔ Always pair with a properly functioning air dryer to prevent moisture damage to the compressor
SOLD AS REMANUFACTURED – CORE RETURN REQUIRED
Built to OEM standards — thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
Warranty Information
