Product overview

The Caterpillar 371-3974 is a genuine Cat electronically controlled common-rail diesel fuel injector. It precisely meters and injects high-pressure fuel into the combustion chamber at the timing commanded by the engine control module.

It is principally associated with the Cat C7.1 diesel engine and is used across various Caterpillar construction machines and industrial applications. Caterpillar describes it as a “low-power” common-rail injector. Official Cat product page

Main features

• High-pressure common-rail fuel delivery
• Precise electronic control of injection timing and fuel quantity
• Coated internal plungers for increased wear resistance
• Designed for modern low-sulfur, low-lubricity diesel fuels
• Helps maintain correct engine power, fuel economy and combustion performance
• Factory-tested to Caterpillar performance and reliability standards
• Direct factory-fit component for specified Cat engine configurations
• Genuine Cat parts carry a 12-month warranty, subject to Caterpillar’s warranty terms

Primary engine application

• Caterpillar C7.1
• C7.1 Industrial Engine

Compatible Caterpillar equipment

According to the official Cat catalogue, applications include:

• Excavators: 320, 320D, 320D2, 323, 323D2, 326, 326D2, 329D2, 330, 330D2, 330 GC, 333 GC
• Wheel loaders: 924, 924K, 926, 930, 930K, 938 and 938K
• Track-type tractors: D4, D5, D5R2, D6K, D6K2 and D6N
• Track loaders: 953 and 953K
• Motor graders: 120 and 140 GC
• Soil/vibratory compactors: CS12, CS14, CS16, CS19, CS20, CS56B, CS68B, CS74B, CS78B, CS79B, CP12, CP14, CP16, CP17 and others
• Asphalt pavers: AP600, AP600F, AP655 and AP655F
• Wheeled excavators/material handlers: M320, M320D2, M322D2, M324D2 MH and MH3032
• Other equipment: PL61 pipelayer and 525D wheel skidder

The Cat catalogue also lists a 3512B generator-set application, but compatibility should be confirmed using the machine serial number because most 371-3974 applications are associated with the C7.1 platform.