CAT 3B0551 PLUG for C18 Caterpillar Part - WSTPARTS
3B0551 PLUG is a Electrical System component engineered for Caterpillar C18, C15 and 365B machines, built to match original factory specifications. It is categorized under Electrical System. Every unit is fitment-verified before dispatch. Manual reference: 3306: ELECTRICAL AND STARTING SYSTEM, group 007-0950, page 1173; 330D: FUEL SYSTEM, group 262-2222, page 125.
3B0551 PLUG for Caterpillar C18 — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement PLUG (Part # 3B0551). Designed for CAT C18, C15, 365B, 336D, 325C, 325D, 3306, 330C, 330D, 3412C, 3512, G3508, 345B equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18, C15, 365B, 336D, 325C, 325D, 3306, 330C, 330D, 3412C, 3512, G3508, 345B
- ✔ Meets Caterpillar original quality and performance standards
- ✔ Genuine CAT lines: New Genuine / Cat Reman / Cat Classic | OEM-equivalent direct replacements
- ✔ Available for order, contact for lead time
Specifications
| Part Number (MPN) | 3B0551 |
| Product Name | PLUG |
| Brand | CAT |
| Applicable Models | C18, C15, 365B, 336D, 325C, 325D, 3306, 330C, 330D, 3412C, 3512, G3508, 345B |
| Weight | 0.09 kg |
| Condition | New (Genuine CAT / OEM-equivalent direct replacement) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 3B0551 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 |
| 3306 | ELECTRICAL AND STARTING SYSTEM | 007-0950 | p.1173 |
| 330D | FUEL SYSTEM | 262-2222 | p.125 |
| 336D | FUEL SYSTEM | 262-2222 | p.146 |
| 3412C | BASIC ENGINE | 153-3434 | p.198 |
| 345B | FUEL SYSTEM | 112-0666 | p.129 |
| 3512 | BASIC ENGINE | 114-9437 | p.119 |
| 3516B | COOLING SYSTEM | 263-8038 | p.297 |
| 365B | FUEL SYSTEM | 138-5596 | p.116 |
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 3B0551 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 C18.
Genuine CAT vs direct replacement — what is the difference?
Genuine CAT covers three factory lines: New Genuine, Cat Reman (core exchange with core charge) and Cat Classic (brand-new economy line). OEM-equivalent direct replacements are non-CAT parts; grade and warranty are confirmed in the quotation.
Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a warranty per quotation.
📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com
