CAT 7K4129 FITTING for 345C Caterpillar Part - WSTPARTS
7K4129 FITTING is a Hydraulic System component engineered for Caterpillar 345C, C18 and 345B machines, built to match original factory specifications. It is categorized under Hydraulic System. Every unit is fitment-verified before dispatch. Manual reference: 3512: FUEL SYSTEM, group 032-1267, page 653; C13: FUEL SYSTEM, group 245-1099, page 525.
7K4129 FITTING for Caterpillar 345C — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement FITTING (Part # 7K4129). Designed for CAT 345C, C18, 345B, 3306, 3512, C13, 345D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345C, C18, 345B, 3306, 3512, C13, 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) | 7K4129 |
| Product Name | FITTING |
| Brand | CAT |
| Applicable Models | 345C, C18, 345B, 3306, 3512, C13, 345D |
| Weight | 0.05 kg |
| Condition | New (Genuine CAT / OEM-equivalent direct replacement) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 7K4129 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 |
| 3512 | FUEL SYSTEM | 032-1267 | p.653 |
| C13 | FUEL SYSTEM | 245-1099 | p.525 |
| C18 | FUEL SYSTEM | 199-3154 | p.612 |
| 3306 | FUEL SYSTEM | 150-3730 | p.896 |
| 345B | AIR INLET AND EXHAUST SYSTEM | 131-8931 | p.105 |
| 345C | FUEL SYSTEM | 246-4786 | p.116 |
| 3512 | FUEL SYSTEM | 032-1267 | p.655 |
| C13 | FUEL SYSTEM | 245-1099 | p.528 |
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.
System Notes — AIR INLET AND EXHAUST SYSTEM
The air inlet and exhaust system covers the air cleaner housing and elements, intake piping, turbocharger, aftercooler, exhaust manifold, turbo mounting hardware and gaskets. It delivers clean, dense air and carries hot gas away. On this group, the two dominant failures are dust ingress and heat cycling: a leaking intake joint lets unfiltered air straight into the cylinders and dusts the rings in a few hundred hours, while exhaust manifold and turbo flange gaskets crack from repeated heat cycles and start whistling or sooting. Parts are replaced when boost drops, the intake tract shows dust trails past the filter, or a soot streak appears at a joint.
FAQ
Is 7K4129 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
