Description
KB799318X – HORTON DRIVEMASTER REMAN FAN CLUTCH (WESTERN STAR / CATERPILLAR C15 & C16 ACERT)
PART NUMBER(S):
Fleet Products: KB799318X (Remanufactured) | OE: Horton 999318, Caterpillar 20R-8399, Kit Masters 99318
DESCRIPTION:
Model: Horton DM Advantage – On/Off (Remanufactured)
Vehicles: Western Star (2003–2005) with Caterpillar C15 and C16 ACERT engines
• Clutch Type: On/Off Drivemaster with complete clutch pack
• Drive Ratio: 1.2:1
• Back Pulley Diameter: 7.54″
• Front Pulley Diameter: 9.04″
• Belt Configuration: Dual Pulley – 6PK & 8PK
• Belt Groove Location: 1.94″
• Fan Pilot Diameter: 2.56″
• Fan Drive Bolt Pattern: 6x, 3/8-24 Thread, 0.81″ Long
• Fan Blade Bolt Circle: 3.5″
• Fan Blade Stud Length: 0.81″ (.375-24 UNF thread)
• Vertical Mounting Distance: 4″
• Horizontal Mounting Distance: 5″
• Overall Length: 7.6″
• Weight: 57.6 lbs
Applications:
Is this fan clutch compatible with your Caterpillar-powered Western Star✔ Yes—purpose-built for 2003–2005 models with C15 and C16 ACERT engines, this Horton Drivemaster delivers rugged reliability, dual belt drive flexibility, and OE-fit cooling performance for demanding fleet duty.
CROSS-REFERENCE(S):
20R-8399, 3443-99318, 3443-993182, 3912-79A9318, 3912-999318, 3912999318, 799318, 79A5318, 79A9318, 79A9318-2, 79A9318RMAN, 989318, 99318, 999318, 999318-HO, 999318HO, 99A9318, 99a9318, ABP N20 99318, ABP N20 993182, ABPN2099318, ABPN20993182, FLT99318, FLT993182, HOR 79A9318, HOR799318, HOR79A9318, HOR999318, K799318, KM N20 99318, KM N20 993182, KMI99318, KMI993182, KMN2099318, KMN20993182, R799318, RC799318, RF799318X, ZBH79A9318, ZBH999318
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports, pulley diameters, and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Confirm belt configuration and groove location (1.94″) before installation.
✔ Ensure vertical (4″) and horizontal (5″) mounting distances align with OE bracket.
✔ Use included hardware kit to ensure full clutch pack rebuild.
✔ Align VIN and Caterpillar engine family before ordering to guarantee compatibility.
Drivemaster On/Off Repair Kits:
SOLD AS REMANUFACTURED – CORE RETURN REQUIRED
Built to OEM standards — thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
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Warranty Information
