Description
PAI Industries 180943 accessory-drive idler pulley for Cummins ISX, ISX15, QSX15, and X15 heavy-duty diesel engines. Aftermarket replacement for Cummins 3689465 (with companion service number 3682229). Six-rib serpentine pulley with integrated dust shield, ~3.41 in OD, sealed-bearing construction.
Signs You Need a New Idler Pulley
- Chirping, squealing, or grinding from the accessory drive
- Wobble or play when the pulley is rotated by hand
- Uneven serpentine belt wear or thrown belts
- Bearing seizure causing belt slip and accessory dropout
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 180943 |
| Part Type | Accessory Drive Idler Pulley (6-rib, w/ dust shield) |
| Engine Compatibility | Cummins ISX, ISX15, QSX15, X15 |
| Outside Diameter | 3.41 in |
| Belt Profile | 6-rib serpentine |
| Weight | 1.21 lb |
Cross References
This part replaces or is equivalent to the following part numbers:
- Cummins: 3689465, 3682229
- Gates: 36223, 89120
- Stengel Bros: S-23813
- Also known as: 443422891
Applications
This idler pulley fits the following Cummins engine platforms:
- Cummins ISX (CM570, CM870, CM871)
- Cummins ISX15 (CM2250, CM2350)
- Cummins QSX15 (CM2350)
- Cummins X15 (CM2350, CM2450)
Representative vehicles using these engines:
- Freightliner Cascadia, Columbia, Century, Coronado (2001–2024)
- Kenworth T680, T880, T800, W900, T600 (2001–2024)
- Peterbilt 579, 567, 389, 388, 387, 379 (2001–2024)
- International LT, ProStar, LoneStar, 9900i, PayStar (2001–2024)
- Volvo VNL, VNR (Cummins option)
- Western Star 4900, 5700 (Cummins option)
Verify accessory-drive layout before ordering — ISX engines use multiple idler positions (Cummins 4026886 / PAI 180942 is the smaller 6-groove idler used on a different bracket).
