Cummins Fleetguard LF14000NN Lube Filter for QST30 & ISX15 — Pack of 1, High‑Capacity Direct‑Fit Oil Filter

The Cummins LF14000NN Fleetguard lube filter is a high-capacity replacement oil filter engineered for Cummins QST30 and ISX15 diesel engines, delivering reliable contaminant capture and service compatibility.

This Fleetguard LF14000NN is designed as a direct-fit lubrication filter for heavy-duty Cummins applications, cross-referenced with DBL7900, P559000, and BD50000. With a robust construction and metric thread form, it provides the filtration area and sealing dimensions needed for demanding commercial and industrial duty cycles. The details below explain how it fits, what to expect during installation, and which engines and part numbers it replaces.

How does the LF14000NN match my Cummins engine?

The LF14000NN is specified for Cummins QST30 and ISX15 engines and aligns with original equipment geometry and thread specifications. It replaces several cross-reference part numbers so you can swap it into existing service intervals without modifying the engine.

• Primary application: Cummins part 4367100.
• Cross references: DBL7900, P559000, BD50000.
• Designed for QST30 and ISX15 series heavy-duty engines.
• Direct-fit replacement — no adapter required when matched to compatible housings.

What are the key physical and thread specifications?

Understanding the LF14000NN’s dimensions helps confirm fit and seal integrity during installation. The filter uses a metric thread and includes gasket and outer diameters sized to match the filter housing face.

• Overall height: 294.69 mm (11.602 in).
• Largest outside diameter / gasket OD: 120.3 mm (4.736 in).
• Thread diameter: 95 mm (3.74 in); thread pitch: 2.5 mm (0.098 in).
• Thread class: 7H; thread form: metric.

What installation and operational features should I expect?

The LF14000NN incorporates standard lube-filter features for heavy-duty service: a durable casing, correct sealing flange, and filtering media sized for engine oil contamination control. It does not include a bypass standpipe or specified BPV setting in its published data, so confirm system requirements before installation.

• No standpipe included; verify engine housing design before fitment.
• BPV setting not specified—use with compatible housings or OEM-recommended valves.
• Robust construction suited to long intervals typical of heavy-duty fleets.
• Pack quantity: 1 filter per purchase.

Who is this for? The Cummins LF14000NN Fleetguard lube filter is intended for fleet managers, technicians, and operators maintaining Cummins QST30 or ISX15 diesel engines who need a reliable, direct-fit oil filter. It works well for heavy trucks, generators, and industrial equipment that require OEM-equivalent filtration performance and specific metric thread fitment. Confirm cross-reference numbers and physical measurements against your engine’s service manual or existing filter to ensure compatibility before ordering.