Cummins 5633492 Air Brake Compressor Kit - 1 - wisentpartscenter.com

Description

3689649RX is a Genuine Cummins ReCon single-cylinder air brake compressor for select 15L Cummins ISX / QSX and X15 applications. The RX suffix identifies this as a Cummins ReCon remanufactured part, not a basic aftermarket rebuild. This compressor supplies compressed air for the truck’s air brake system and other air-operated components. Verify 3689649RX by ESN, original compressor number, engine model, gear/drive setup, mounting flange, air line routing, coolant line routing, and the supersession list shown on this page. Air compressor replacement is labor-heavy, so correct matching matters; the wrong compressor can create fitment issues, slow air build, oil carryover, leaks, or repeat removal.

Purpose of the Part

The air brake compressor is engine-driven and builds air pressure for the vehicle’s air brake system. It works with the governor, air dryer, reservoirs, and safety valves to keep the system within the proper pressure range. If the compressor cannot build air correctly, the truck may have slow air recovery, low air warnings, or brake-system downtime.

Issue Symptoms / When to Replace

Common signs that 3689649RX may need inspection or replacement include:

  • Slow air pressure build-up
  • Low air pressure warning or repeated air-pressure drop
  • Compressor not reaching governor cut-out pressure
  • Excessive oil in the discharge line, wet tank, or air dryer
  • Compressor head, gasket, or fitting leaks
  • Abnormal compressor noise, knocking, or overheating
  • Air dryer repeatedly purging or passing heavy oil/water contamination
  • Failed air compressor output test after checking governor, air dryer, leaks, and lines

No reliable part-specific electronic fault codes were found for 3689649RX. Air compressor complaints are usually diagnosed by air system pressure tests, leak checks, governor operation, discharge line condition, and air dryer inspection rather than a single engine fault code.

Brand Information

Cummins is the OEM engine manufacturer for ISX / X15 platforms and supplies genuine engine-mounted air system components for those applications. Cummins ReCon parts are remanufactured to Cummins standards and identified by the RX suffix. For an air brake compressor, Genuine Cummins ReCon is preferred when avoiding repeat air-system issues is critical, since another compressor replacement can be expensive in labor, downtime, and air-system cleanup.

Installation Notes

Before replacing 3689649RX, confirm the ESN, original compressor number, and supersession list shown on this page. Drain air pressure from the system and follow lockout safety procedures before removing air lines. Inspect the governor, air dryer, discharge line, coolant lines, oil feed/drain paths, fittings, and mounting surface before installing the replacement. Replace required gaskets and seals, keep debris out of the air and oil passages, and verify air build time, governor cut-in/cut-out, leaks, and oil carryover after installation. Refer to Cummins QuickServe or the OEM service manual for torque specs and final test procedure.

How to Identify an OEM Part

A Genuine Cummins 3689649RX air compressor should be verified by the Cummins ReCon label, original packaging, compressor tag or casting identification, mounting flange, drive/gear setup, and port layout. Match the removed compressor to 3689649RX and to the supersession list shown on this product page. Do not rely on appearance only, because similar WABCO-style compressors can differ by drive gear, flange, discharge port, coolant routing, or application.

Why buy from Wisent Parts
  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warrany & Return Information

Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.

Cummins

Genuine Cummins parts for heavy-duty trucks. Browse OEM Cummins turbochargers, turbo actuators, fuel injectors, fuel pumps, EGR components, sensors, and more for ISB 6.7L, ISX15, ISL 8.9L, and other Cummins diesel engines.

View all