CAT 1142687 SEAL-O-RIN for C18 Caterpillar Part - WSTPARTS
1142687 SEAL-O-RIN is a Drivetrain component engineered for Caterpillar C18, C15 and 3306 machines, built to match original factory specifications. It is categorized under Drivetrain. Every unit is fitment-verified before dispatch. Manual reference: 3306: LUBRICATION SYSTEM, group 114-2687, page 277; 3406C: LUBRICATION SYSTEM, group 114-4427, page 454.
1142687 SEAL-O-RIN for Caterpillar C18 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement SEAL-O-RIN (Part # 1142687). Designed for CAT C18, C15, 3306, 3406C, C9 equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18, C15, 3306, 3406C, C9
- ✔ 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) | 1142687 |
| Product Name | SEAL-O-RIN |
| Brand | CAT |
| Applicable Models | C18, C15, 3306, 3406C, C9 |
| Weight | 0.05 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 1142687 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 |
| 3306 | LUBRICATION SYSTEM | 114-2687 | p.277 |
| 3406C | LUBRICATION SYSTEM | 114-4427 | p.454 |
| C15 | LUBRICATION SYSTEM | 212-1487 | p.527 |
| C18 | LUBRICATION SYSTEM | 212-1487 | p.304 |
| C9 | LUBRICATION SYSTEM | 241-7783 | p.114 |
| 3306 | SERVICE EQUIPMENT AND SUPPLIES | 114-2687 | p.1897 |
| 3406C | LUBRICATION SYSTEM | 114-4427 | p.455 |
| C15 | LUBRICATION SYSTEM | 240-6053 | p.528 |
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 — SERVICE EQUIPMENT AND SUPPLIES
This group covers the equipment and consumables used to service the machine rather than to run it: filter wrenches and service tools, drain and fill hardware, grease fittings and couplers, sight gauges, sampling valves, and the small hardware that makes routine maintenance possible without improvising. Items here are replaced when they no longer seal, no longer hold a setting, or when a stripped fitting turns a ten-minute service job into a two-hour one. Keeping the correct part number on hand matters more than the unit price, because a missing grease coupler usually means a missed lube point.
FAQ
Is 1142687 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 C18.
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
