CAT 4D3734 UNION for C18 Caterpillar Part - WSTPARTS
WSTPARTS supplies the 4D3734 UNION, a CAT Fitting replacement part designed for Caterpillar C18 applications. It is categorized under Fitting. Every unit is fitment-verified before dispatch. Manual reference: C18: LUBRICATION SYSTEM, group 200-3123, page 384.
4D3734 UNION for Caterpillar C18 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement UNION (Part # 4D3734). Designed for CAT C18 equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18
- ✔ 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) | 4D3734 |
| Product Name | UNION |
| Brand | CAT |
| Applicable Models | C18 |
| Weight | 0.18 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 4D3734 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 |
| C18 | LUBRICATION SYSTEM | 200-3123 | p.384 |
| C18 | LUBRICATION SYSTEM | 200-3123 | p.385 |
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 4D3734 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
