Description
If your Massey Ferguson is running hot during heavy work or the fan’s roaring like a freight train even when it’s cool outside, your viscous fan clutch has likely called it quits. This temperature-sensitive component is the brain of your cooling system, automatically engaging the fan when needed and freeing up valuable horsepower when it’s not. A locked fan constantly consumes 15-20 horsepower, even during cold morning starts or light work. This viscous clutch disengages when cooling isn’t needed, returning that power to your PTO or drawbar.
What You’re Getting
- Contains specially formulated silicone fluid that responds predictably to temperature changes—as coolant temperature rises, the fluid’s viscosity increases, progressively engaging the fan to provide exactly the cooling needed
- Can free up 10-15 horsepower during normal operation compared to a direct-drive fan while still providing maximum cooling when you need it
- Robust sealed construction prevents contamination that would alter the clutch’s carefully calibrated response, ensuring years of maintenance-free operation
- Viscous coupling modulates engagement smoothly, preventing the shock loads that destroy fixed drives
Built for Real Farm Work
SISU engines demand specific cooling management, and this viscous fan clutch delivers exactly what these Finnish powerplants need. Automatically adjusting fan speed based on temperature, it optimizes cooling while reducing fuel consumption and noise. Essential for maintaining peak performance in your 6400 or 7400 series SISU-powered tractor. These high-horsepower machines work hard whether you’re pulling wide tillage equipment, powering large balers, or running heavy PTO implements all day long.
Made to Last
The SISU engines in these high-horsepower Massey Ferguson models have unique cooling requirements. This viscous clutch is engineered specifically for SISU’s operating characteristics, engagement temperatures, and airflow needs. These high-horsepower tractors generate significant heat and require precise cooling management.
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. Clean the radiator thoroughly to ensure proper airflow. 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.
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