Original MANN-FILTER Oil filter W 940 – Hydraulics filter suitable for automatic transmissions – For Trucks, Busses and Utility Vehicles

MANN‑FILTER W 940 Oil Filter

The MANN‑FILTER W 940 is a high‑performance hydraulic oil filter engineered for automatic transmissions in heavy‑duty vehicles such as trucks, buses and utility machines. Designed with precision engineering, it delivers reliable protection against contaminants while maintaining optimal fluid flow.

Key Design Features

• Robust Construction: The filter housing is made from durable alloy that resists corrosion and withstands the high pressures typical of hydraulic systems.
• Advanced Filtration Media: Inside, a multi‑layered media captures particles as small as 1 µm, ensuring clean oil reaches critical components.
• Anti‑Return Valve: A built‑in valve prevents backflow of contaminated fluid, preserving filter integrity and extending service life.
• Threaded Mounting: The 3/4‑16 UNF thread size allows easy installation on a wide range of transmission housings without the need for adapters.
• Leak‑Proof Seal: A high‑temperature O‑ring guarantees a tight seal, preventing oil leaks that could compromise safety and performance.

Performance Specifications

Applications and Compatibility

The W 940 is engineered to fit a broad spectrum of automatic transmission systems across multiple vehicle categories:

• Commercial Trucks: Ideal for heavy‑load operations where hydraulic fluid purity directly impacts drivetrain longevity.
• Buses and Coaches: Provides consistent protection in passenger transport vehicles that demand high reliability.
• Utility Vehicles: Suitable for construction, agricultural and industrial machines that rely on robust hydraulic performance.

Its universal thread design allows seamless integration with transmission housings from manufacturers such as Porsche, Lancia, Renault, Volvo, Isuzu, and many others, making it a versatile choice for fleet operators and maintenance teams worldwide.

Installation Guidelines

1. Preparation: Ensure the transmission is cooled to ambient temperature. Remove any existing filter carefully to avoid contaminant spillage.
2. Cleaning: Wipe the mounting surface with a lint‑free cloth to remove dust or debris that could compromise sealing.
3. Seating: Align the threaded end of the W 940 and hand‑tighten. Use a torque wrench set to the manufacturer’s recommended value (typically 10–12 Nm) for optimal seal integrity.
4. Verification: After installation, check for leaks around the filter housing. A properly seated filter should exhibit no fluid seepage under normal operating pressure.

Maintenance and Replacement Cycle

While the W 940 is built for durability, regular inspection ensures peak performance:

• Visual Check: Inspect for signs of wear or damage to the housing and O‑ring.
• Fluid Condition: Monitor oil color and viscosity; a sudden change may indicate filter blockage.
• Replacement Interval: For most heavy‑duty applications, replace every 12–18 months or after 10,000–15,000 km of operation, whichever comes first. Adjust based on operating conditions such as high‑temperature environments or aggressive loading.

Benefits to Operators

• Extended Component Life: By trapping contaminants before they reach the transmission, the filter reduces wear on gears and bearings.
• Consistent Performance: Maintains optimal hydraulic pressure and flow, ensuring smooth gear shifts and reliable vehicle operation.
• Reduced Downtime: The anti‑return valve and robust seal minimize maintenance interruptions caused by leaks or filter failures.
• Cost Efficiency: High filtration efficiency translates to fewer oil changes and lower overall operating costs over the vehicle’s lifecycle.

Quality Assurance

The W 940 undergoes rigorous testing in accordance with ISO 9001 standards. Each unit is inspected for dimensional accuracy, pressure tolerance, and filtration performance before leaving the factory. This commitment to quality guarantees that every filter delivers reliable protection from the moment it is installed.

Conclusion

The MANN‑FILTER W 940 Oil Filter stands out as a premier choice for automatic transmission systems in trucks, buses and utility vehicles. Its combination of robust construction, advanced filtration media, and user‑friendly design ensures that hydraulic fluids remain clean, pressures stay stable, and vehicle components enjoy extended service life. For operators seeking dependable performance and long‑term cost savings, the W 940 is an investment that pays dividends through enhanced reliability and reduced maintenance demands.