5585420 | Genuine Cummins® Twin Cylinder Air Brake Compressor for 8.9L ISC/ISL

SKU: 5585420 MPN: 5585420

Protect braking performance with the Twin Cylinder Air Brake Compressor from Cummins. Part number: 5585420. Condition: new. Water-cooled, engine-lubricated, 3000 RPM, 145 psi for Cummins 8.9L ISC/ISL heavy-duty trucks.

$3,349.00
No Core Charge
3 in stock

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Product Description

Product Name Air Brake Compressor Product Name Air Brake Compressor
Type Twin Cylinder Type Twin Cylinder
Condition New Condition New
Brand Cummins® Brand Cummins®
Part Number 5585420 Part Number 5585420
Cross Reference 5585420RX Cross Reference 5585420RX
Engine Compatibility
Cummins ISC, ISL Cummins ISC, ISL
Specifications
Cooling Water Cooling Water
Crankshaft thread M20 x 1.5 Crankshaft thread M20 x 1.5
Lubrication Lubrication supplied from engine Lubrication Lubrication supplied from engine
Max. operating pressure 145.0 psi Max. operating pressure 145.0 psi
Mounting Mounting Flange Mounting Mounting Flange
Operating speed 3000 (1/min) Operating speed 3000 (1/min)
Piston diameter 2.95 in Piston diameter 2.95 in
Piston stroke 2.20 in Piston stroke 2.20 in
Port thread 0 0.98 in Port thread 0 0.98 in
Port thread 2 M27 x 2 Port thread 2 M27 x 2
Port thread 4 M10 x 1.0 Port thread 4 M10 x 1.0
Port thread 8.1 M10 x 1 Port thread 8.1 M10 x 1
Port thread 9 3/4 Port thread 9 3/4
Port thread 9.1 3/4 Port thread 9.1 3/4
Port thread 9.2 3/4 Port thread 9.2 3/4
Temperature range -30°C to +90°C Temperature range -30°C to +90°C

Useful Information

Description and Purpose:

This Genuine Twin Cylinder Air Brake Compressor, designed for heavy-duty braking systems and built by Cummins, comes in new condition under Part number: 5585420. With a twin-cylinder layout, water-based cooling, and engine-fed lubrication, it delivers steady air pressure needed for safe and consistent brake performance across ISC, ISL, and L9 engine platforms. Cross reference: 5585420RX.

Why Replacement is Important:

Over time, internal wear can reduce pressure output, causing slow system buildup or unstable brake performance. Replacing the compressor ensures the air system reaches and maintains the correct pressure during demanding driving conditions.

Impact on Vehicle Performance:

A properly functioning compressor supports quicker air recovery, reliable brake response, and overall improved braking stability—especially under heavy loads or frequent stop-and-go operation.

Manufacturer Information:

Cummins®, a long-established leader in commercial-grade engines and components, supplies durable air system parts engineered for longevity, efficiency, and compatibility with modern heavy-duty vehicles.

Tags & Category: Twin Cylinder Air Brake Compressor, Air Brake Compressor, Truck Air Compressor, Cummins Air Compressor, 8.9L ISC Air Compressor, 8.9L ISL Air Compressor, Twin Cylinder Truck Compressor

Warranty:

Parts Finder Q offers a 365-days warranty for all types of parts in any condition. The warranty applies exclusively to purchases made directly through our website (partsfinderq.com). Please note that purchases made through third-party platforms like eBay or Amazon are not covered by this warranty.

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  • Icon Truck, Fast Delivery
    Free shipping over $199 Place an order today and receive it on Mar 6
  • Clock Icon
    Orders placed before 7-PM EST will ship same business day
  • Location icon, warehouse pickup point.
    Pickup available usually ready in 24 hours
  • Need it fast? We offer overnight shipping

    Contact us to check if overnight next-day delivery is available for your order - PN: 5585420