Description
KB799644-2X – DRIVEMASTER TWO-SPEED FAN CLUTCH MACK MP8/MP10, VOLVO D13
PART NUMBER(S):
Fleet Products: KB799644-2X (Remanufactured) | Replaces OE: Mack 21596045, 22113077, 40MH4103M | Volvo 20883819, 21192240, 21210845, 21251045, 21434730, 21508301, 21596045, 21925087, 22113052, 22113077, 85115602, 85139329 | Horton 79A5644-2, 79A7253, 79A9552, 79A9552-2, 79A9554, 79A9644, 79A9644-2, 98A9552, 98A9552-2, 98A9554, 98A9644, 98A9644-2, 98A9646, 99A7253, 99A9552, 99A9552-2, 99A9644, 99A9644-2, 99A9646 | Kit Masters 99552, 995522, 99644 | Fleetrite FLT99552, FLT995522 | Alliance ABPN2099552, ABPN20995522
DESCRIPTION:
Model: Horton Drivemaster Two-Speed Fan Clutch (Remanufactured)
Vehicles: Mack Anthem, CXU, CXU613, CX613 (2007–2020, MP8/MP10 engines); Volvo VNL, VNM (2007–2018, D13 engines)
• Back Pulley Diameter: 7.87"
• Overall Length: 6.13"
• Belt Configuration: 12PK
• Belt Groove Location: 1.48" from clutch face
• Bolt Circle: 3.5"
• Fan Pilot Diameter: 2.56"
• Fan Blade Stud Length: 1.07" (3/8-24 UNF thread)
• Vertical Mounting Distance: 7.21"
• Horizontal Mounting Distance: 6.73"
• Center of JB to Top Right Mounting Hole: 4.39"
• Drive Mode: Two-speed (eddy current low speed, spring-actuated high speed)
• Construction: Heavy-duty bearings and long-life friction liners
Applications: Designed for heavy-duty Mack and Volvo trucks with MP8, MP10, and D13 engines, delivering reliable cooling control for long-haul and vocational duty cycles. Optimized for performance, fuel efficiency, and durability in high-demand fleet operations.
CROSS-REFERENCE(S):
010021884, 1000-799644, 1000799644, 24-465CK, 3443-99552, 3443-995522, 3912-79A9644-2, 43MH58M, 704549AT, 799644, 799644-2, 85115602, 85139329, 9810069, 9810069-2, 9810241, 989644, 989644-2, 9910069, 9910069-2, 9910241, 99644-2, 996813252, 996813892, 996813932-001, 999644, 999644-2, FC799644, FC799644-2, FTL799644, FTL799644-2, HO99A9644-2, HOR79A9644, HOR79A9644-2, HOR99A7253, HOR99A9644, HOR99A9644-2, K599552, K799644-2, KMN2099552, KMN20995522, KMI995522, R799644-2, RC799644, RX79A9644-2RMAN, RX79A9644-2RMANRF, ZBH79A96442
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:
✔ Always check fan clutch for wear or damage before installation.
✔ Ensure proper air system pressure for clutch engagement.
✔ Torque all mounting bolts to manufacturer specifications.
✔ Verify belt alignment and tension to avoid premature failure.
✔ Replace worn seals or O-rings to prevent leaks.
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.
Warranty Information
