CAT 6B8129 NIPPLE for C18 Caterpillar Part - WSTPARTS
WSTPARTS supplies the 6B8129 NIPPLE, a CAT Fitting replacement part designed for Caterpillar C18, C15 and 3412C applications. It is categorized under Fitting. Every unit is fitment-verified before dispatch. Manual reference: 3406E: ELECTRICAL AND STARTING SYSTEM, group 130-1159, page 415; 3412C: LUBRICATION SYSTEM, group 149-7545, page 227.
6B8129 NIPPLE for Caterpillar C18 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement NIPPLE (Part # 6B8129). Designed for CAT C18, C15, 3412C, 3406E equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18, C15, 3412C, 3406E
- ✔ 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) | 6B8129 |
| Product Name | NIPPLE |
| Brand | CAT |
| Applicable Models | C18, C15, 3412C, 3406E |
| Weight | 0.14 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 6B8129 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 |
| 3406E | ELECTRICAL AND STARTING SYSTEM | 130-1159 | p.415 |
| 3412C | LUBRICATION SYSTEM | 149-7545 | p.227 |
| C15 | ELECTRICAL AND STARTING SYSTEM | 136-2641 | p.944 |
| C18 | ELECTRICAL AND STARTING SYSTEM | 136-2641 | p.533 |
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 — LUBRICATION SYSTEM
The lubrication system covers the oil pump, oil cooler, oil filter base, relief valves, dipstick tube, pan and the galleries that distribute oil to every bearing in the engine. It is the system that keeps metal off metal. Failures tend to be either pressure loss — a worn pump, a stuck relief valve, a collapsed filter — or contamination, where sludge and debris circulate and score bearing surfaces. Oil pressure that reads low at idle, a filter that comes out heavy, or oil that turns dark far sooner than usual are the signals. Parts in this group are replaced on measured oil pressure and lab results rather than on interval alone.
FAQ
Is 6B8129 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 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
Parts Diagram3406E
