CAT 1075769 SEAL O RIN for 345C Caterpillar Part - WSTPARTS
1075769 SEAL O RIN is a Drivetrain component engineered for Caterpillar 345C, C18 and C15 machines, built to match original factory specifications. It is categorized under Drivetrain. Every unit is fitment-verified before dispatch. Manual reference: 3406E: FUEL SYSTEM, group 150-4279, page 331; 345C: BASIC ENGINE, group 113-8987, page 55.
1075769 SEAL O RIN for Caterpillar 345C — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement SEAL O RIN (Part # 1075769). Designed for CAT 345C, C18, C15, 3406E, C13, C27, C32, 345D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345C, C18, C15, 3406E, C13, C27, C32, 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) | 1075769 |
| Product Name | SEAL O RIN |
| Brand | CAT |
| Applicable Models | 345C, C18, C15, 3406E, C13, C27, C32, 345D |
| Weight | 0.05 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 1075769 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 | 150-4279 | p.331 |
| 345C | BASIC ENGINE | 113-8987 | p.55 |
| C13 | BASIC ENGINE | 236-4570 | p.153 |
| C15 | FUEL SYSTEM | 150-4279 | p.821 |
| C18 | FUEL SYSTEM | 241-2422 | p.253 |
| C27 | COOLING SYSTEM | 349-5622 | p.119 |
| C32 | COOLING SYSTEM | 355-9202 | p.173 |
| 3406E | FUEL SYSTEM | 131-8270 | p.335 |
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 — BASIC ENGINE
The basic engine group covers the core structure and internals: cylinder block, cylinder head, pistons, rings, liners, connecting rods, crankshaft, bearings, camshaft and the gasket sets that seal them. These parts determine compression, oil pressure and power output. They wear gradually — rings lose tension, bearings show copper, liners glaze — and the first signs are usually blow-by from the breather, rising oil consumption, or a knock that gets louder as the engine warms. Replacing a basic engine part is a planned overhaul decision rather than a roadside fix, so matching the exact part number and serial number range matters more here than anywhere else on the machine.
FAQ
Is 1075769 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
