CAT 1978391 SENSOR for 345C Caterpillar Part - WSTPARTS

The 1978391 SENSOR is a genuine and high-quality OEM replacement part compatible with Caterpillar 345C, C18 and C15 equipment. It is categorized under Sensor. Every unit is fitment-verified before dispatch. Manual reference: 325D: ELECTRICAL AND STARTING SYSTEM, group 257-2186, page 241; 330D: FUEL SYSTEM, group 237-8752, page 117.

1978391 SENSOR for Caterpillar 345C — Genuine & OEM Replacement Part

WSTPARTS supplies genuine and high-quality OEM replacement SENSOR (Part # 1978391). Designed for CAT 345C, C18, C15, 336D, 325D, 330D, C13, C7, C9 equipment.

Compatible Models

Key Features

• ✔ 100% compatible with CAT 345C, C18, C15, 336D, 325D, 330D, C13, C7, C9
• ✔ Meets Caterpillar original quality and performance standards
• ✔ Genuine CAT parts with anti-counterfeit label | OEM alternatives with warranty
• ✔ Available for order, contact for lead time

Specifications

Part Number (MPN)	1978391
Product Name	SENSOR
Brand	CAT
Applicable Models	345C, C18, C15, 336D, 325D, 330D, C13, C7, C9
Weight	0.05 kg
Condition	New (Genuine / OEM Equivalent)
Warranty	12 Months

Where This Part Fits

Every row below is a real listing of 1978391 in the Caterpillar parts manual: the machine it is published under, the system it belongs to, the group number and the manual page. Use it to confirm the part against your own parts book before ordering.

Machine	System	Group No.	Manual Page
325D	ELECTRICAL AND STARTING SYSTEM	257-2186	p.241
330D	FUEL SYSTEM	237-8752	p.117
336D	FUEL SYSTEM	314-3708	p.126
345C	FUEL SYSTEM	246-3265	p.117
C13	FUEL SYSTEM	245-1099	p.524
C15	FUEL SYSTEM	240-6040	p.771
C18	FUEL SYSTEM	240-6040	p.437
C7	ELECTRICAL AND STARTING SYSTEM	231-1977	p.643

System Notes — ELECTRICAL AND STARTING SYSTEM

The electrical and starting system covers the battery, starter motor, alternator, wiring harness, relays, switches and the instrument panel. It carries current from the batteries to the starter to crank the engine, and from the alternator back to keep the batteries charged. Because these machines work in dust, vibration and wide temperature swings, connectors corrode, harness insulation chafes against the frame, and starter solenoids burn out from repeated short cranks. Parts in this group are usually replaced on a symptom basis — slow cranking, a dash warning, lights that dim under load, or a no-start condition traced to an open circuit.

System Notes — FUEL SYSTEM

The fuel system covers the injection pump, injectors, fuel transfer pump, filters and water separator, lines and the tank. It meters and atomises diesel at the precise moment and quantity the engine needs. Modern CAT engines run very tight injector tolerances, so the group is sensitive to water and dirt: a worn injector dribbles instead of atomising, causing rough idle, white smoke and diluted oil, while a clogged filter starves the pump under load. Parts here are replaced when the engine misfires, smokes, loses power under load, or when the water separator keeps tripping — always after the fuel quality itself has been ruled out.

FAQ

Is 1978391 the right part for my machine?
Match the part number on your old part, or send us your equipment serial number — WSTPARTS verifies fitment free of charge for CAT 345C.

Genuine vs OEM replacement — what is the difference?
Genuine CAT parts carry an anti-counterfeit label. OEM equivalents are built to the same specifications, bench-tested and supplied with full warranty at a better price.

Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a 12-month warranty.

📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com