Viscous Fan Clutch with Hex Shaft Drive for Massey Ferguson High HP Series Tractors

Description

When your high-horsepower Massey Ferguson starts overheating on hot days or you hear that fan roaring constantly even during light work, it’s time to replace that viscous fan clutch. A locked fan constantly steals 10-20 horsepower, robbing you of precious power when you need every bit at the drawbar. This hex shaft drive viscous clutch puts that power back where it belongs while keeping your cooling system working exactly when it should.

What You’re Getting

• Temperature-sensitive viscous coupling that automatically adjusts fan speed based on actual engine heat
• Hex shaft drive design that handles the heavy torque demands of high-horsepower engines without slipping
• Smart power management that frees up 10-20 horsepower during normal operation when full cooling isn’t needed
• Smooth progressive engagement that prevents shock loads on belts and other cooling components
• Works perfectly with fan blade 63313 for complete cooling system service

Built for Real Farm Work

Your 6400 or 7400 series tractor at the top of the range packs serious horsepower. Whether pulling wide tillage equipment, powering large balers, or operating high-capacity implements, these machines generate serious heat under load. The hex shaft drive design handles the torque requirements of these high-horsepower engines. Unlike belt-driven fans that slip under load, this direct drive ensures positive engagement when cooling is critical.

Made to Last

This viscous clutch uses specially formulated silicone fluid sealed inside a precision-machined housing. The fluid responds predictably to temperature changes throughout its service life, automatically engaging more as things heat up and backing off when cooling isn’t needed. The robust construction prevents contamination that would throw off the clutch’s carefully calibrated response.

Installation Notes

Never lay the clutch on its side or upside down – this can cause the silicone fluid to migrate and affect operation. Check fan blade condition and balance – a damaged fan will quickly destroy a new clutch. The hex drive requires proper alignment during installation, and you’ll want to clean that radiator while you’re at it. The clutch should spin freely when cold but show increasing resistance as it warms. After installation, monitor temperature gauge behavior – proper clutch operation maintains steady temperatures rather than cycling between hot and cold.