CAT 6V3908 SEAL-O-RIN for 345C Caterpillar Part - WSTPARTS
Need a dependable Drivetrain part for your Caterpillar 345C, C18 and 3516B machine? The 6V3908 SEAL-O-RIN from WSTPARTS is manufactured to OEM-grade tolerances. It is categorized under Drivetrain. Every unit is fitment-verified before dispatch. Manual reference: 330D: LUBRICATION SYSTEM, group 187-0474, page 67; 3406C: LUBRICATION SYSTEM, group 267-5201, page 403.
6V3908 SEAL-O-RIN for Caterpillar 345C — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement SEAL-O-RIN (Part # 6V3908). Designed for CAT 345C, C18, 3516B, 336D, 3516C, 330C, 330D, 3406C, 345B, 3508C, 3512, 3512C, 3516, 3606, 3608, 365B, C13, C15, C9, G3508, G3608, G3612, G3616, 345D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 345C, C18, 3516B, 336D, 3516C, 330C, 330D, 3406C, 345B, 3508C, 3512, 3512C, 3516, 3606, 3608, 365B, C13, C15, C9, G3508, G3608, G3612, G3616, 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) | 6V3908 |
| Product Name | SEAL-O-RIN |
| Brand | CAT |
| Applicable Models | 345C, C18, 3516B, 336D, 3516C, 330C, 330D, 3406C, 345B, 3508C, 3512, 3512C, 3516, 3606, 3608, 365B, C13, C15, C9, G3508, G3608, G3612, G3616, 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 6V3908 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 | LUBRICATION SYSTEM | 187-0474 | p.67 |
| 336D | LUBRICATION SYSTEM | 187-0474 | p.80 |
| 3406C | LUBRICATION SYSTEM | 267-5201 | p.403 |
| 345B | LUBRICATION SYSTEM | 144-6648 | p.61 |
| 3508C | LUBRICATION SYSTEM | 245-3678 | p.160 |
| 3512 | LUBRICATION SYSTEM | 148-8007 | p.329 |
| 3512C | LUBRICATION SYSTEM | 261-7305 | p.148 |
| 3516 | LUBRICATION SYSTEM | 115-7860 | p.192 |
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.
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 6V3908 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
