CAT 1N3789 BASE A for C15 Caterpillar Part - WSTPARTS
Need a dependable Filter System part for your Caterpillar C15 and 3406E machine? The 1N3789 BASE A from WSTPARTS is manufactured to OEM-grade tolerances. It is categorized under Filter System. Every unit is fitment-verified before dispatch, backed by factory-direct pricing and warranty coverage, and currently in stock for dispatch within 24 hours. Manual reference: 3406E: FUEL SYSTEM, group 164-0449, page 316; C15: FUEL SYSTEM, group 257-7275, page 761.
1N3789 BASE A for Caterpillar C15 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement BASE A (Part # 1N3789). Designed for CAT C15, 3406E equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C15, 3406E
- ✔ Meets Caterpillar original quality and performance standards
- ✔ Genuine CAT parts with anti-counterfeit label | OEM alternatives with warranty
- ✔ In stock, ready to ship
Specifications
| Part Number (MPN) | 1N3789 |
| Product Name | BASE A |
| Brand | CAT |
| Applicable Models | C15, 3406E |
| Weight | 0.59 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 1N3789 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 | FUEL SYSTEM | 164-0449 | p.316 |
| C15 | FUEL SYSTEM | 257-7275 | p.761 |
| 3406E | FUEL SYSTEM | 139-3501 | p.318 |
| 3406E | FUEL SYSTEM | 124-3397 | p.334 |
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 1N3789 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 C15.
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?
In stock — ships within 24 hours. Every order is covered by a 12-month warranty.
📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com
