4318218RX | Genuine Cummins® Single Cylinder Air Brake Compressor for ISX and QSX engines

SKU: 4318218RX MPN: 4318218RX

Stay on top of every stop with this Genuine Cummins Air Brake Compressor. Part number: 4318218RX. Condition: new, single-cylinder and water-cooled, built to deliver reliable air pressure for ISX and QSX engines.

$1,599.00
No Core Charge
8 in stock, ready to ship

Pickup available at Warehouse - Howard st 7092 ste F

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: 4318218RX

  • Free shipping over $199 Order today — get it
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    Orders before 7 PM EST ship same business day
  • Location icon, warehouse pickup point.
    Pickup available. Usually ready in 24 hours

Product Description

Product Name Air Brake Compressor Product Name Air Brake Compressor
Type Single Cylinder Type Single Cylinder
Brand Cummins® Brand Cummins®
Condition New Condition New
Part Number 4318218RX Part Number 4318218RX
Cross Reference 4318218 Cross Reference 4318218
Engine Compatibility
Cummins ISX, QSX Cummins ISX, QSX
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 3.35 in Piston diameter 3.35 in
Piston stroke 2.20 in Piston stroke 2.20 in
Port thread 0 0.81 in Port thread 0 0.81 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 Ø 0.32 in Port thread 8.1 Ø 0.32 in
Port thread 9 M18 x 1.5 Port thread 9 M18 x 1.5
Port thread 9.1 M18 x 1.5 Port thread 9.1 M18 x 1.5
Port thread 9.2 M18 x 1.5 Port thread 9.2 M18 x 1.5
Swept volume (cm³) 318 cm3 Swept volume (cm³) 318 cm3
Temperature range -30°C to +90°C Temperature range -30°C to +90°C

Useful Information

Description and Purpose:

This Genuine Cummins Air Brake Compressor with Part number: 4318218RX is supplied in new condition and designed for Cummins ISX and QSX engines. The compressor features a water-cooled, single-cylinder configuration with engine-supplied lubrication to ensure stable air output for braking and auxiliary pneumatic systems. Flange mounting and a maximum operating pressure of 145 psi support reliable operation under continuous and heavy-duty working conditions. Cross reference: 4318218

Why Replacement is Important:

A worn or failing air brake compressor can lead to insufficient air pressure, slow system recovery, and compromised braking performance. Replacing the unit restores proper air supply, helps prevent pneumatic system faults, and supports safe vehicle operation.

Impact on Vehicle Performance:

Consistent air pressure delivery ensures responsive brake operation and stable auxiliary system function. Installing a new compressor helps maintain predictable braking behavior, improves system reliability, and reduces the risk of air-related downtime.

Manufacturer Information:

Cummins® delivers precision-engineered components designed to ensure reliable engine performance, accurate fit, and long-term durability in demanding diesel applications.

Tags & Category: Air Brake Compressor, Cummins, Single Cylinder, Cummins Air Compressor, Air Brake System, Heavy Duty Truck, Commercial Vehicle, Diesel Engine Component, Brake Air Supply, Truck Air Compressor, Pneumatic System

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: 4318218RX