Cummins 3313283 (Fleetaire Model LF777, Also Often Corresponding To 3889311) Is A Bypass Oil Filter Element Specifically Designed For Cummins K Series Heavy-duty Diesel Engines, Used For Precise Oil Filtration And Extending Engine Life.

Cummins 3313283 (Fleetaire model LF777, also often corresponding to 3889311) is a bypass oil filter element specifically designed for Cummins K series heavy-duty diesel engines, used for precise oil filtration and extending engine life.

I. Basic Information
Part Number: Cummins 3313283 / 3889311; Fleetguard LF777
Type: Bypass Oil Filter (used in conjunction with full-flow filters)
Applicable Engines: Cummins K19, K38, K50, NT855, N14, VTA28 and other heavy-duty diesel engines, widely used in generator sets, mining machinery, ships, and construction machinery.

II. Technical Specifications
Dimensions:
Height: Approximately 249 mm
Outer Diameter: Approximately 116 mm
Thread: 1 3/8-16 UNS-2B
Filtering Precision: 10–15 μm, effectively removing metal debris, soot, and varnish.
Filter Material: Multi-layer structure of imported American fiberglass / composite filter paper, with high dirt-holding capacity, corrosion resistance, and fatigue resistance.
Working Pressure / Temperature: Nominal pressure 0.6 bar; operating temperature 0–80°C.

III. Structure and Features
Bypass Design: Parallel to the main oil circuit, it finely filters part of the engine oil, complementing the full-flow filter to protect precision bearings and mating parts.
High-Strength Structure: Thickened steel plate frame, oil-resistant resin seal, resistant to vibration and pressure fluctuations.
Static Electricity Discharge: The filter material can discharge static electricity, preventing black carbon accumulation and the risk of electric shock.
Original Quality: Genuine Cummins Fleetguard part, with filtration efficiency and lifespan meeting OEM standards.

IV. Main Functions
Removes solid particles, varnish, and sludge of 10–15 μm in engine oil, reducing engine wear.
Extends the service life of engine oil, maintains stable oil pressure, and enhances system reliability.
Protects engine precision components, reduces maintenance costs, and extends the overall machine life.

V. Interchangeable Models
Cummins: 3889311, 3304232, 3313284
Fleetguard: LF777
Other Brands: Baldwin BT8840, Donaldson P553000, etc.

VI. Replacement Recommendations
Cycle: Every 250–500 hours (or when changing engine oil), shorten the cycle under harsh conditions.
Installation: Apply clean engine oil to the sealing ring before installation, tighten and then turn 3/4–1 turn to avoid over-tightening or leakage.

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