CAT 4H6112 BREATHER for 345C Caterpillar Part - WSTPARTS
4H6112 BREATHER is a Lubrication component engineered for Caterpillar 345C machines, built to match original factory specifications. It is categorized under Lubrication. Every unit is fitment-verified before dispatch. Manual reference: 330D: HYDRAULIC SYSTEM, group 199-4539, page 575; 325C: HYDRAULIC SYSTEM, group 191-2693, page 695.
4H6112 BREATHER for Caterpillar 345C — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement BREATHER (Part # 4H6112). Designed for CAT 345C, 320C, 320D, 325C, 325D, 330C, 330D, 345D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345C, 320C, 320D, 325C, 325D, 330C, 330D, 345D
- ✔ Meets Caterpillar original quality and performance standards
- ✔ Genuine CAT lines: New Genuine / Cat Reman / Cat Classic | OEM-equivalent direct replacements
- ✔ Available for order, contact for lead time
Specifications
| Part Number (MPN) | 4H6112 |
| Product Name | BREATHER |
| Brand | CAT |
| Applicable Models | 345C, 320C, 320D, 325C, 325D, 330C, 330D, 345D |
| Weight | 0.14 kg |
| Condition | New (Genuine CAT / OEM-equivalent direct replacement) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 4H6112 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 | 199-4539 | p.575 |
| 336D | UNDERCARRIAGE | 199-4539 | p.378 |
| 325C | HYDRAULIC SYSTEM | 191-2693 | p.695 |
| 325D | HYDRAULIC SYSTEM | 191-2693 | p.548 |
| 330C | HYDRAULIC SYSTEM | 199-4539 | p.655 |
| 345C | HYDRAULIC SYSTEM | 227-6113 | p.580 |
| 330D | HYDRAULIC SYSTEM | 199-4539 | p.566 |
| 345C | HYDRAULIC SYSTEM | 227-6114 | p.582 |
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 4H6112 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 CAT vs direct replacement — what is the difference?
Genuine CAT covers three factory lines: New Genuine, Cat Reman (core exchange with core charge) and Cat Classic (brand-new economy line). OEM-equivalent direct replacements are non-CAT parts; grade and warranty are confirmed in the quotation.
Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a warranty per quotation.
📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com
