Product Description
KB799559-2X – DRIVEMASTER TWO-SPEED FAN CLUTCH DETROIT DIESEL D13
PART NUMBER(S):
Fleet Products: KB799559-2X (Remanufactured) | OE: Horton 79A9559-2, 99A9559-2, Kit Masters 99559
DESCRIPTION:
Model: Horton Drivemaster Two-Speed Fan Clutch (Remanufactured)
Vehicles: Western Star 4900; other Class 8 trucks (Detroit Diesel D13, Cummins ISX)
• Back Pulley Diameter: 7.83"
• Overall Length: 12.6"
• Belt Configuration: 12PK
• Belt Groove Location: 6.65"
• Bolt Circle: 3.5"
• Fan Pilot Diameter: 2.56"
• Fan Blade Stud Length: 0.81" (3/8-24 thread)
• Vertical Mounting Distance: 1.42"
• Horizontal Mounting Distance: 4.06"
• Center of JB to Top Right Mounting Hole: 1.02"
• Drive Mode: Two-speed (low-speed eddy current, high-speed spring-actuated)
• Construction: Heavy-duty bearings, Kevlar-impregnated friction liners
Applications: Is this fan clutch compatible with your Detroit Diesel D13-powered Volvo or Western Star truck? Yes — engineered for adaptive cooling, reduced radiator wear, faster warm-up, and maximum cooling under heavy load. Ideal for long-haul, vocational, and fleet operations in demanding conditions.
CROSS-REFERENCE(S):
010023621, 10021057, 10032431, 21596045, 22113077, 3443-99559, 3443-995592, 3912-79A96442, 706304AT, 79A9559, 79A9559-2, 79A9559-2RMAN, 79A9595, 79A9644-2, 98A9552-2, 98A95522, 98A9559, 98A9559-2, 98A9595, 98a9559, 99A8110, 99A9559, 99A9559-2, 99A9644-2, 99a9559, 9910023, ABP N20 99559, ABP N20 995592, ABPN2099559, ABPN20995592, F17-1014M03, F17-6014M06, F17-6017M28, FLT99559, FLT995592, HOR 79A9559 2, HOR79A9595, HOR98A9595, HOR99A8110, HOR99A9559-2, HOR99A9595, KM N20 99559, KM N20 995592, KMI99559, KMI995592, KMN2099559, KMN20995592, WST 4900 330MM FAN CENTER 99A9559 99A9559-2, 799559-2, 79A9559-2, 989559-2, 98A9559-2, 99559-2, 999559-2, 99A9559-2, FTL799559-2, 799559, 79A9559, 989559, 98A9559, 99559, 999559, 99A9559, FTL799559.
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Confirm 12PK belt configuration and 7.83" pulley diameter match OE spec.
✔ Ensure fan pilot and mounting dimensions match OEM specifications.
✔ Replace worn mounting hardware before installation.
✔ Compatible with Horton and competitor core returns.
Drivemaster 2-Speed 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.
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, call 1-877-243-0442 or email sales@fleet-products.com
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