CAT 3B4618 COTTER PIN for 345C Caterpillar Part - WSTPARTS
WSTPARTS supplies the 3B4618 COTTER PIN, a CAT Pin/Bushing replacement part designed for Caterpillar 345C, 345B and 365B applications. It is categorized under Pin/Bushing. Every unit is fitment-verified before dispatch. Manual reference: 330D: FRAME AND BODY, group 278-3810, page 295; 336D: FRAME AND BODY, group 237-8768, page 284.
3B4618 COTTER PIN for Caterpillar 345C — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement COTTER PIN (Part # 3B4618). Designed for CAT 345C, 345B, 365B, 325C, 325D, 330D, 3512, 320C, 320D, 330C, 345D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345C, 345B, 365B, 325C, 325D, 330D, 3512, 320C, 320D, 330C, 345D
- ✔ 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) | 3B4618 |
| Product Name | COTTER PIN |
| Brand | CAT |
| Applicable Models | 345C, 345B, 365B, 325C, 325D, 330D, 3512, 320C, 320D, 330C, 345D |
| Weight | 0.05 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 3B4618 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 |
| 330D | FRAME AND BODY | 278-3810 | p.295 |
| 336D | FRAME AND BODY | 237-8768 | p.284 |
| 3512 | BASIC ENGINE | 032-1269 | p.123 |
| 325C | FRAME AND BODY | 177-6322 | p.367 |
| 325D | FRAME AND BODY | 223-3043 | p.286 |
| 330C | FRAME AND BODY | 190-7170 | p.353 |
| 345B | FRAME AND BODY | 126-6323 | p.333 |
| 345C | FRAME AND BODY | 223-2967 | p.294 |
System Notes — FRAME AND BODY
The frame and body group covers the main frame, counterweight, fenders, steps, handrails, access doors, panels and the mounting hardware that ties them together. It carries every load the machine generates and every load the attachment imposes back into the structure. Cracks almost always start at a weld toe or a bolt hole where a mounting has worked loose, and a loose guard or step is both a structural and a safety issue. Parts in this group are replaced after impact damage, after crack repair, or when fasteners no longer hold torque because the hole has elongated.
System Notes — BASIC ENGINE
The basic engine group covers the core structure and internals: cylinder block, cylinder head, pistons, rings, liners, connecting rods, crankshaft, bearings, camshaft and the gasket sets that seal them. These parts determine compression, oil pressure and power output. They wear gradually — rings lose tension, bearings show copper, liners glaze — and the first signs are usually blow-by from the breather, rising oil consumption, or a knock that gets louder as the engine warms. Replacing a basic engine part is a planned overhaul decision rather than a roadside fix, so matching the exact part number and serial number range matters more here than anywhere else on the machine.
FAQ
Is 3B4618 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
