Overview: LF3970 Heavy-Duty Full-Flow Spin-On Engine Lube Filter
The Landown LD-LF3970 Lube Oil Filter (Fleetguard LF3970 direct replacement) is a premium heavy-duty spin-on filtration unit designed specifically for Cummins B-Series 4-cylinder and 6-cylinder diesel engines (ISB 5.9L, QSB 5.9L, ISB 6.7L, QSB 6.7L, 4BT, 6BT, 6BTA). Engineered to withstand rigorous high-mileage highway transport, off-highway agricultural cultivation, and heavy construction duty cycles, the LF3970 provides high-capacity particle entrapment and low flow restriction, ensuring consistent oil lubrication pressure and superior wear protection for turbochargers, main bearings, and cylinder liners.
Key Performance & Construction Features
- Advanced Multi-Layer Synthetic Media: Precision-engineered gradient-density filter media captures microscopic soot and wear particles down to 30 microns (TWA efficiency 98.7%) without creating restrictive cold-start pressure drops.
- Heavy-Gauge Steel Canister: Drawn heavy-duty steel shell resists extreme pulse fatigue pressures, road vibration, and thermal expansion under demanding operating loads.
- Precision Machined Baseplate & Thread: Heavy steel baseplate with precision 1-1/8-16 UN-2B rolled threads ensures smooth installation torque and leak-proof mating with Cummins engine blocks.
- Heat-Resistant Nitrile Gasket: High-grade Buna-N gasket compound resists hardening, cracking, and oil degradation across extreme temperature ranges (-40°C to +120°C).
Technical Specifications
| Specification / Parameter | Verified Technical Detail |
|---|---|
| Product Model / SKU | LD-LF3970 / LF3970 |
| Primary OEM Part Number | Cummins 3937736 / 3937144 / 5404947 |
| Filter Type | Full-Flow Spin-On Engine Lube Oil Filter |
| Thread Size | 1 1/8-16 UN-2B (1-1/8″-16 UN) |
| Overall Height | 176.78 mm (6.96 in) |
| Largest Outer Diameter (OD) | 93.47 mm (3.68 in) |
| Seam Outer Diameter | 93.22 mm (3.67 in) |
| Gasket Outside Diameter (OD) | 71.88 mm (2.83 in) |
| Gasket Inside Diameter (ID) | 62.48 mm (2.46 in) |
| Filtration Efficiency (TWA) | 98.7% @ 30 Micron (Synthetic High-Capacity Media) |
| Bypass Valve (BPV) Setting | 0 kPa / 0 PSI (Engine Block Internal Bypass System) |
| Anti-Drainback Valve (ADBV) | No (Vertical base-down mounting configuration) |
OEM Interchange & Cross-Reference Table
| Brand / Manufacturer | Cross Reference / Equivalent Part Number |
|---|---|
| Fleetguard (OEM) | LF3970, LF3729, LF3937 |
| Cummins | 3937736, 3937144, 3942365, 5404947, 5296733, A041C694 |
| Donaldson | P550428, P551019 |
| Baldwin | B7177, BK6031 |
| Wix | 57182, 57028, 57182MP |
| Luber-finer | LFP3970, LFP3729 |
| Volvo | 14406393, 43919927, 85114081 |
| Case IH / New Holland | J937736, J942365, 702619A1, 84476755 |
| JCB | 32925413 |
| Fram / Hastings | PH8942 / LF551 |
Engine & Equipment Application Guide
The LF3970 lube filter is engineered as a direct replacement across a broad range of Cummins-powered commercial on-highway trucks, construction machinery, agricultural tractors, and marine engines:
- Cummins Diesel Engines:
- 5.9L B-Series: ISB 5.9L (24V), QSB 5.9L, 4BT 3.9L, 6BT 5.9L, 6BTA 5.9L (1998–2007)
- 6.7L B-Series: ISB 6.7L, QSB 6.7L, ISBe4, ISBe6 (Tier 3 / Stage IIIA)
- Commercial On-Highway Trucks & Buses: Freightliner (FL50, FL60, FL70, M2 Business Class), International / Navistar, Ford F-650 / F-750 (Cummins ISB 5.9L), Blue Bird & Thomas Built School Buses.
- Agricultural & Construction Equipment: Case IH Tractors & Combines, New Holland Harvesters, JCB Excavators & Loaders, Komatsu Industrial Power, Hyundai Construction Equipment.
- Stationary Power & Marine Propulsion: Cummins Marine Auxiliary Generator Sets, Cummins Onan Commercial Marine Diesels, Irrigation & Industrial Pump Units.
B2B Wholesale, OEM & Custom Manufacturing Capabilities
Landown Filter is a specialized global exporter and manufacturer of heavy-duty oil, fuel, and air filtration solutions. We support worldwide distributors, fleet operations, and private label aftermarket brands:
- Custom Laser & Silk-Screen Branding (OEM/ODM): Customized private label printing, custom part numbering, and brand logo silk-screening on filter canisters.
- Export Packaging Solutions: High-strength master cartons (12-pack or 24-pack cases), custom brand retail boxes, palletized container consolidation.
- Strict Quality & Leak Testing: 100% burst pressure, pulse fatigue, and bubble leak tested in compliance with ISO 4548 (Methods of test for full-flow lubricating oil filters).
- Factory-Direct Wholesale Pricing: Stable volume capacity, tiered distributor discounts, and rapid global fulfillment.
Frequently Asked Questions (FAQ)
Q1: Is the Landown LF3970 oil filter a direct replacement for Fleetguard LF3970 and Cummins 3937736?
A: Yes. The Landown LF3970 is manufactured to identical OEM dimensional and filtration standards. It features exact 1-1/8-16 UN-2B threads, 176.78 mm overall height, and 93.47 mm outer diameter for direct spin-on fitment without adapters.
Q2: Why does the LF3970 have no internal bypass valve or anti-drainback valve?
A: Cummins 5.9L and 6.7L ISB/QSB engine blocks are engineered with a built-in oil pressure relief/bypass valve and vertical base-down filter mounting headers. Therefore, the filter cartridge itself utilizes a 0 PSI / open configuration to prevent double-bypassing and ensure maximum oil flow.
Q3: What are the standard oil filter change intervals for Cummins ISB 5.9L engines?
A: Standard on-highway intervals range between 15,000 and 20,000 miles (or 500 operating hours in industrial/agricultural duty). In severe dust or high-load towing environments, filter replacement every 10,000 miles / 250–300 hours is recommended.
Q4: What is the packaging specification and MOQ for wholesale orders?
A: Standard packaging is packed 12 units per master export carton. We support flexible trial order quantities for new distributors, as well as full pallet and 20ft/40ft FCL container shipments with custom brand packaging.