Product Description
KB799381X HORTON DRIVEMASTER REMAN FAN CLUTCH – FOR WESTERN STAR / MBE4000
PART NUMBER(S):
HORTON OEM: 79A9381, 989381, 99A9381, 999381
KIT MASTER: 99381
DESCRIPTION:
Sold as Remanufactured – Core Return Required
Heavy-duty two-speed engine cooling fan clutch
Designed for use on Western Star trucks with Mercedes-Benz MBE4000 engines
Reliable replacement for Horton DriveMaster models used in Navistar, Freightliner, Volvo, Sterling, and Mack
Compatible with air-operated clutch systems
SPECIFICATIONS:
Application: Western Star with Mercedes-Benz MBE4000
Back Pulley Diameter: 8.55 in
Overall Length: 6.25 in
Belt Configuration: 8 PK
Belt Groove Location: 1.38 in
Bolt Circle: 3.5 in
Fan Pilot Diameter: 2.56 in
Fan Blade Stud Length: 1.05 (.312-18)
Vertical Mounting Distance: 10 in
Horizontal Mounting Distance: 2.36 in
CROSS-REFERENCE(S):
12930926901, 3443-99381, 3443-993812, 3912-79A9381, 3912-999381, 3912999381, 799381, 79A9381, 79A9381RMAN, 989381, 98A9381, 99381, 999381, 999381-HO, 999381H0R, 999381HO, 99A9381, 99a9381, ABP N20 99381, ABP N20 993812, ABPN2099381, ABPN20993812, FLT99381, FLT993812, HOR 79A9381, HOR 999381, HOR79A9381, HOR999381, KM N20 99381, KM N20 993812, KMI99381, KMI993812, KMN2099381, KMN20993812, PFC FLT99381, ZBH79A9381
INSTALLATION NOTES:
✔ Confirm pulley size and bolt pattern match original equipment
✔ Use thread locker and torque to OEM specs during installation
✔ Replace any gaskets, O-rings, or worn hardware
✔ Test clutch engagement post-install before returning to service
✔ Inspect fan blades for wear or imbalance prior to reassembly
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, call 1-877-243-0442 or email sales@fleet-products.com and reference Code WEB01.
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