CAT 6T3645 BREAKER for C18 Caterpillar Part - WSTPARTS
Need a dependable Hydraulic System part for your Caterpillar C18, C15 and 3512 machine? The 6T3645 BREAKER from WSTPARTS is manufactured to OEM-grade tolerances. It is categorized under Hydraulic System. Every unit is fitment-verified before dispatch. Manual reference: 3306: ELECTRICAL AND STARTING SYSTEM, group 270-4655, page 1155; 3412C: ELECTRICAL AND STARTING SYSTEM, group 154-9668, page 435.
6T3645 BREAKER for Caterpillar C18 — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement BREAKER (Part # 6T3645). Designed for CAT C18, C15, 3512, 3306, 3412C, C27, G3508 equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18, C15, 3512, 3306, 3412C, C27, G3508
- ✔ 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) | 6T3645 |
| Product Name | BREAKER |
| Brand | CAT |
| Applicable Models | C18, C15, 3512, 3306, 3412C, C27, G3508 |
| 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 6T3645 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 | 270-4655 | p.1155 |
| 3412C | ELECTRICAL AND STARTING SYSTEM | 154-9668 | p.435 |
| 3512 | ELECTRICAL AND STARTING SYSTEM | 172-0258 | p.751 |
| C15 | ELECTRICAL AND STARTING SYSTEM | 240-0170 | p.336 |
| C18 | ELECTRICAL AND STARTING SYSTEM | 240-0170 | p.267 |
| C27 | ELECTRICAL AND STARTING SYSTEM | 364-5713 | p.309 |
| G3508 | ELECTRICAL AND STARTING SYSTEM | 112-3455 | p.448 |
| 3406E | ELECTRICAL AND STARTING SYSTEM | 141-6172 | p.358 |
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.
FAQ
Is 6T3645 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
