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Shop By Brand

The Following brands are available based on your search.

  • Dayco
    Dayco
  • Gates
    Gates

Best Selling Genuine Western Star Belt Idler Pulleys

  • We Stock the following top leading brands, including Dayco, Gates
  • Constantly Updated Inventory of Western Star Replacement Belt Idler Pulley Parts

We stock Belt Idler Pulley parts for most Western Star models, including 4800, 4900EX, 4900FA, 4900SA, 6900XD.

Dayco
2005 Western Star 4900FA Drive Belt Idler Pulley - Main Drive 6 Cyl 14.6L Dayco

P311-0A85A36    89101  New

Qty:
$31.76
Dayco Drive Belt Idler Pulley  Main Drive
  • Smooth
  • Product Attributes:
    • :
      • 39.25
      • 74
    • Bearing Inner Diameter 1: 17
    • Bearing Inner Diameter 2: 17
    • Bearing Width: 24
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 08 Rib
    • Number of Bearings: 2
Brand: Dayco
Additional Fitment Information:
Vehicle Block CC CID Position
2005 - Western Star 4900FA L 14640 893 Main Drive
Dayco
2011 Western Star 4900SA Drive Belt Idler Pulley 6 Cyl 12.8L Dayco

P311-5DBDD67    89058  New

Qty:
$22.31
Dayco Drive Belt Idler Pulley
  • Product Attributes:
    • :
      • 30
      • 70
    • Bearing Inner Diameter 1: 17
    • Bearing Inner Diameter 2: 17
    • Bearing Width: 24
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 06 Rib
    • Number of Bearings: 2
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Dayco
Additional Fitment Information:
Vehicle Block CC CID
2011 - Western Star 4900SA L 12816 781
Dayco
Qty:
$45.05
Dayco Drive Belt Idler Pulley  Fan and Water Pump
  • Product Attributes:
    • :
      • 39.4
      • 86.5
    • Bearing Inner Diameter 1: 17
    • Bearing Inner Diameter 2: 17
    • Bearing Width: 24
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 08 Rib
    • Number of Bearings: 2
Brand: Dayco
Additional Fitment Information:
Vehicle Block CC CID Position
2002 - Western Star 4900SA L 15000 915 Fan and Water Pump
Dayco
2005 Western Star 4900FA Drive Belt Idler Pulley - Main Drive 6 Cyl 14.6L Dayco

P311-1EB4642    89112  New

Qty:
$61.00
Dayco Drive Belt Idler Pulley  Main Drive
  • Grooved
  • Product Attributes:
    • :
      • 37.5
      • 74
    • Bearing Inner Diameter 1: 17
    • Bearing Inner Diameter 2: 17
    • Bearing Width: 28
    • Belt Type: Serpentine
    • Flat: N
    • Groove Quantity: 8
    • Material: Steel
    • Max Belt Width: 08 Rib
    • Number of Bearings: 2
Brand: Dayco
Additional Fitment Information:
Vehicle Block CC CID Position
2005 - Western Star 4900FA L 14640 893 Main Drive
Gates
Qty:
$65.19
Gates Drive Belt Idler Pulley  Grooved Pulley
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2007 - Western Star 4900EX L 14640 893 DIESEL Grooved Pulley
Gates
Qty:
$66.74
Gates Drive Belt Idler Pulley  Smooth Pulley
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2007 - Western Star 4900SA - - 763 DIESEL Smooth Pulley
Gates
Qty:
$28.16
Gates Drive Belt Idler Pulley  Smooth Pulley
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2007 - Western Star 4900EX L 14640 893 DIESEL Smooth Pulley
Gates
Qty:
$40.53
Gates Drive Belt Idler Pulley  Alternator (Upper)
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2009 - Western Star 4900SA L 14640 893 DIESEL Alternator (Upper)
Gates
Qty:
$40.53
Gates Drive Belt Idler Pulley  Alternator (Lower)
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2009 - Western Star 4900SA L 14640 893 DIESEL Alternator (Lower)
Gates
Qty:
$41.59
Gates Drive Belt Idler Pulley  Air Conditioning (Lower)
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2009 - Western Star 4900SA L 14640 893 DIESEL Air Conditioning (Lower)
Gates
Qty:
$36.58
Gates Drive Belt Idler Pulley  Alternator and Air Conditioning
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2015 - Western Star 4900EX L 15000 915 DIESEL Alternator and Air Conditioning
Gates
1997 Western Star 4800 Drive Belt Idler Pulley 6 Cyl 10.3L Gates

P311-22AAC1F    36091  New

Qty:
$28.16
Gates Drive Belt Idler Pulley
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type
1997 - Western Star 4800 L 10309 629 DIESEL
Gates
Qty:
$40.53
Gates Drive Belt Idler Pulley  Air Conditioning (Upper)
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2009 - Western Star 4900FA L 14640 893 DIESEL Air Conditioning (Upper)
Gates
Qty:
$40.53
Gates Drive Belt Idler Pulley  Air Conditioning (Lower)
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2009 - Western Star 4900FA L 14640 893 DIESEL Air Conditioning (Lower)
Gates
Qty:
$41.59
Gates Drive Belt Idler Pulley  Alternator (Lower)
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2009 - Western Star 4900FA L 14640 893 DIESEL Alternator (Lower)
Gates
Qty:
$45.81
Gates Drive Belt Idler Pulley  Air Conditioning (Upper)
  • DriveAlign® Idler Pulleys
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2009 - Western Star 4900SA L 14640 893 DIESEL Air Conditioning (Upper)
Gates
Qty:
$66.74
Gates Drive Belt Idler Pulley  Accessory Drive
  • DriveAlign® Idler Pulleys
  • Smooth Pulley
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2004 - Western Star 4900SA - - 763 DIESEL Accessory Drive
Gates
Qty:
$65.19
Gates Drive Belt Idler Pulley  Accessory Drive
  • DriveAlign® Idler Pulleys
  • Grooved Pulley
  • DriveAlign Premium OE Pulley
Brand: Gates
Additional Fitment Information:
Vehicle Block CC CID Fuel Type Position
2004 - Western Star 4900SA - - 763 DIESEL Accessory Drive