CAT 2270590 BREATHER G for 345C Caterpillar Part - WSTPARTS
The 2270590 BREATHER G is a genuine and high-quality OEM replacement part compatible with Caterpillar 345C, 330D and 325D equipment. It is categorized under Lubrication. Every unit is fitment-verified before dispatch. Manual reference: 330D: HYDRAULIC SYSTEM, group 239-1611, page 395; 336D: UNDERCARRIAGE, group 289-5565, page 515.
2270590 BREATHER G for Caterpillar 345C — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement BREATHER G (Part # 2270590). Designed for CAT 345C, 330D, 325D, 336D, 320D, 345D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345C, 330D, 325D, 336D, 320D, 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) | 2270590 |
| Product Name | BREATHER G |
| Brand | CAT |
| Applicable Models | 345C, 330D, 325D, 336D, 320D, 345D |
| Weight | 0.41 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 2270590 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 | HYDRAULIC SYSTEM | 239-1611 | p.395 |
| 336D | UNDERCARRIAGE | 289-5565 | p.515 |
| 325D | HYDRAULIC SYSTEM | 227-0566 | p.372 |
| 345C | HYDRAULIC SYSTEM | 227-0431 | p.408 |
| 330D | HYDRAULIC SYSTEM | 289-5565 | p.390 |
System Notes — HYDRAULIC SYSTEM
The hydraulic system covers the main pump, control valves, cylinders, hydraulic tank, filters, hoses and all the fittings that connect them. It converts engine power into the pressure and flow that drive boom, bucket, steering and travel functions. Hydraulic parts fail mainly through contamination and heat: dirt that passes a worn breather scores pump components, aged hoses crack at the crimp, and O-rings harden and weep under pressure. A part in this group is normally replaced when a function drifts, a cylinder creeps, oil shows up under a machine that used to be dry, or the filter comes out loaded with metal.
System Notes — UNDERCARRIAGE
The undercarriage group covers tracks, shoes, links, bushings, rollers, idlers, sprockets, track tensioners and the recoil hardware. It carries the whole machine weight and transmits drive force to the ground, and it is normally the single largest wear cost on a tracked machine. Wear is a system: a worn sprocket accelerates chain wear, a loose track pounds the bushings, and a seized roller flat-spots the link it runs on. Parts here are replaced on measured wear — bushing diameter, shoe height, roller flange — and replacing one component out of phase with the rest usually shortens the life of both.
FAQ
Is 2270590 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
Parts Diagram330D
