S21435 Air Compressor for Cummins ISL ISC 3966521 5301094RX

Product Overview

This aftermarket replacement air compressor is intended for Cummins ISL and ISC applications and cross-references part numbers S21435, 3966521, 3966521RX, 3969110, and 5301094RX. An air compressor pressurizes air for the vehicle air system, supporting functions such as air braking and other air-operated components. It serves as a replacement for the corresponding compressor on the listed engine applications.

Key Features & Performance

• Compresses air to supply the vehicle air system used by air brakes and related air-operated components
• Cross-references part numbers S21435, 3966521, 3966521RX, 3969110, and 5301094RX for comparison with the existing unit
• Supplied for Cummins ISL and ISC engine applications
• Used when servicing or replacing a worn or malfunctioning air compressor

Fitment & Compatibility

• for Cummins ISL applications
• for Cummins ISC applications

Common Uses

• Replacing a worn, leaking, or malfunctioning air compressor
• Servicing the air system on the listed engine applications
• Restoring normal air supply after the original compressor has failed

Technical Specifications

• Product Type: Air Compressor
• Part Number(s): S21435, 3966521, 3966521RX, 3969110, 5301094RX
• Engine Application(s): Cummins ISL, Cummins ISC

Frequently Asked Questions

Q: What does an air compressor do? A: An air compressor pressurizes air for the vehicle air system, which supports air braking and other air-operated functions.

Q: How should fitment be verified? A: Compare the complete existing part number and the full engine model designation against the numbers and applications listed here before purchase.

This is an aftermarket replacement part and is not represented as genuine or original equipment. Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number, model year, or existing part number. Verify fitment before purchase.