The HDFC1878KF50 Heavy Duty Filter Cartridge fits the HDU9778KU50 Unit

• Height: 100mm
• Diameter: 145mm
• Weight: 0.5kg
• Water Retention: 400ml
• Supplied with 1 x spare lid seal

Long fibre cellulose with single core, nylon covering and brass fastening.

🔹Oil doesn’t degrade on its own—it’s contamination that causes the damage.

Fine particles and moisture build up over time, leading to increased wear, reduced efficiency, and costly maintenance. The filter element is the critical component that determines how effectively your system removes these contaminants.

The KLEENOIL HDFC1878KF50 Heavy Duty Replacement Cartridge is engineered to deliver ultra-fine filtration and high water removal, ensuring your oil remains clean, protected, and in optimal condition for longer.

🔹 Where It’s Used

Designed for use within KLEENOIL bypass filtration systems, this cartridge is suitable for:

• Hydraulic systems
• Engines and lubrication systems
• Gearboxes and transmissions
• Diesel fuel systems
• Industrial and mobile equipment

It is specifically matched to HDU9778KU50 systems, ensuring consistent performance and reliability.

🔹 How It Works

Unlike conventional filters that trap contaminants only on the surface, KLEENOIL cartridges use depth filtration technology.

• Contaminated oil enters the core of the cartridge
• Oil is forced through multiple layers of cellulose media
• Particles are trapped throughout the media structure
• Water is absorbed and retained within the fibres
• Clean oil exits the cartridge and returns to the system

This process provides exceptional filtration efficiency and high dirt-holding capacity, maintaining oil cleanliness over extended operating periods.

🔹 Key Benefits

• High-efficiency filtration 
• Removes particles down to 3 micron
• Removes all water (free and emulsified)
• High dirt-holding capacity for extended service life
• Improves oil cleanliness and system reliability
• Extends oil and equipment life

🔹 Performance & Construction

Manufactured using advanced materials, the cartridge combines performance with sustainability:

• Filter Media: Long-fibre cellulose (biodegradable core)
• Outer Wrap: Durable polyester support layer
• Water Capacity: Approx. 400ml per cartridge
• Flow Capability: Up to 250 LPH
• Low Pressure Drop: <0.2 bar (clean filter)

The compact design allows installation within confined systems while maintaining high filtration performance.

🔹 Service & Maintenance

• Recommended change interval: 250–500 hours (application dependent)
• Simple replacement: Drop-in cartridge design
• Shelf life: Up to 2 years (stored correctly)

Regular replacement ensures consistent filtration performance and optimal oil cleanliness.

🔹 Environmental Responsibility

The cartridge uses a biodegradable cellulose core, supporting environmentally responsible filtration.

Once used, the cartridge becomes oil-contaminated and should be disposed of via licensed waste or Waste-to-Energy (WTE) channels, in line with local regulations.

🔹 Technical Highlights

• Micron Rating: 3 micron
• Efficiency: β10 = 1170 (99.9%)
• Water Removal: Up to 99.8%
• Water Capacity: Approx. 400ml
• Flow Rate: Up to 250 LPH
• Operating Temperature: -20°C to +100°C
• Compatible Unit: HDU9778KU50
• Weight: Approx. 0.5kg

🔹 Support & Application Advice

KLEENOIL UK provides a complete support service, working with you to identify the most effective filtration solution for your application. Our goal is simple—deliver consistently clean oil and long-term system performance.

Speak to our team directly on +44 (0) 1977 682810 for tailored advice.

🔹 Filter Replacement (Quick & Clean Process)

Changing your KLEENOIL cartridge is a simple and clean process, designed for minimal mess and quick servicing.

1. Remove the lid
   Undo the retaining bolts and keep them safe for refitting.
2. Prepare the new cartridge
   Unpack the new filter and keep the protective bag aside—you’ll use this for removal of the old element.
3. Remove the used filter (cleanly)
   Place the bag over the filter housing, reach in, and lift the used cartridge out using the brass ring.
   Carefully turn the bag over the filter and seal it to contain oil residue for clean handling.
4. Check and clean the lid
   Wipe the lid with a clean cloth and remove the old lid seal.
   Replace with the new seal, ensuring the sealing surface is clean and free from debris.
5. Install the new filter
   Insert the new cartridge with the brass ring facing upwards, pushing it fully into position.
6. Refit and secure
   Replace the lid and tighten the bolts evenly to ensure a secure seal.
7. Run and check
   Start the system and allow it to run for a few minutes.
   Check the lid area to confirm there are no leaks and the seal is effective.
8. Dispose responsibly
   Dispose of the used cartridge in accordance with local regulations for oil-contaminated waste.