Description
The Fleetguard LF777 is a Cummins Filtration bypass spin-on oil filter rated 30 micron at 99% efficiency, used alongside the full-flow filter on Cummins big-cam engines and Cat 3406/3176 platforms via remote-mount adaptor head 3304173S. Replaces Cummins 3889311, Baldwin B7577, Donaldson P550777, Wix 51749, NAPA 1749, and Cat 1W8845.
Signs You Need a New Bypass Oil Filter
- Oil analysis showing elevated soot, silicon, or wear metals beyond normal limits
- Oil darkening or thickening faster than expected between service intervals
- Increased oil temperature or low oil pressure readings
- Excessive sludge buildup found during valve cover or oil pan inspections
Specifications
| Manufacturer | Fleetguard (Cummins Filtration) |
|---|---|
| Part Number | LF777 |
| Part Type | Bypass Spin-On Oil Filter |
| Overall Height | 9.81 in (249.2 mm) |
| Largest OD | 4.57 in (116.08 mm) |
| Gasket OD | 4.39 in (111.38 mm) |
| Gasket ID | 4.06 in (103.17 mm) |
| Thread Size | 1 3/8-16 UNS-2B |
| Micron Rating | 30 micron @ 99% efficiency |
| Flow Rate | 2.0 GPM (10 L/min) |
| Adaptor Head | 3304173S (remote mount) |
| Engine Compatibility | Cummins NT855, KTA19, KTA38, KTA50, L10/LT10; Cat 3406, 3176 |
Cross References
This part replaces or is equivalent to the following part numbers:
- Cummins: 3889311, 3021658, 3304232, 3308616, 3309637, 3313283, 3313284, 3313289
- Baldwin: B7577
- Donaldson: P550777, P172510
- Wix: 51749
- NAPA: 1749
- Caterpillar: 1W8845, 9Y4468
- Detroit Diesel: 23530413
- Luber-finer: LFP777
- FRAM: P3555A
- Hastings: LF439
- Mahle: OC282
- John Deere: RE42051, AR98330
- Volvo: 11996228
- International: 1666053C1
- Komatsu: 6002121510
- Carquest: 85749
Applications
This bypass oil filter fits the following engines (with remote-mount adaptor head 3304173S):
- Cummins NT855 / NH / NTA855
- Cummins KT/KTA19, KTA38, KTA50
- Cummins L10 / LT10
- Cummins V504, VT1710, VT555
- Caterpillar 3406, 3176B, 3176C, 3116TA
Representative vehicles and equipment using these engines:
- Kenworth W900, T800, C500
- Peterbilt 379, 389, 367
- Freightliner FLD, Classic
- Komatsu, John Deere, and Case construction / off-highway equipment
- Marine and stationary power generation
This is a bypass oil filter and must be used in conjunction with a full-flow oil filter. Verify your engine serial number, adaptor head configuration, and filter housing before ordering.
