Buy 3558189RX - Genuine Cummins Air Compressor - wisentpartscenter.com

Description

Cummins 3558189RX Air Compressor - Genuine Cummins Remanufactured Air Compressor for 8.3L ISC/QSC Engines

The Cummins 3558189RX is a factory-remanufactured single-cylinder air compressor for the 8.3L C Series. It's gear-driven off the engine and pumps compressed air to the truck's tanks for the brakes and air-operated systems, cutting in and out on the governor as pressure demands. Model HD850C/HD850EC, built and remanufactured by Holset (Cummins).

Key Functions:

- Builds the compressed air the brakes and air system run on
- Gear-driven off the engine, governor-controlled load/unload

Fitment & Specifications:

- Application: Cummins 8.3L C Series - ISC / QSC
- Model: HD850C / HD850EC, single cylinder, 11-tooth drive gear

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

A single-cylinder reciprocating compressor driven off the engine gear train. It draws air and pumps it to the supply reservoir for the brakes and air-operated systems, with the governor loading and unloading it to hold system pressure (typically ~120-130 psi cutout).

Issue Symptoms / When to Replace

- Slow air build or won't reach cutout pressure
- Oil in the air system - wet tanks, oil at the dryer, oil blowing through - the classic worn compressor
- Knocking or rattling from the compressor
- Constant cycling or audible air leaks at the head

Brand Information

These compressors are built by Holset, Cummins' own air and turbo division, so a genuine 3558189RX comes with the correct HD850 build and 11-tooth drive gear to mesh and mount to the C8.3 as designed.

Installation Notes

Before you run the new compressor, check and clear the discharge line and air dryer. A carboned-up discharge line is the number one reason a fresh compressor pumps oil and fails again - swapping the compressor without checking it just kills the new one.
Prime it with clean engine oil and hook up the oil and coolant lines correctly before start. Don't let it run dry.

How to Identify an OEM Part

- Look for the Cummins label with P/N 3558189RX and MODEL HD850EC.
- "Remanufactured in Mexico" on the label means it's a genuine factory reman.
- Check the body for cast-in 8558971 and USA.
- Match the label P/N to your listing before buying.

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

Warranty & 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.