CAT 2H3931 SEAL for C9 Caterpillar Part - WSTPARTS
The 2H3931 SEAL is a genuine and high-quality OEM replacement part compatible with Caterpillar C9, 3412C and 3406C equipment. It is categorized under Drivetrain. Every unit is fitment-verified before dispatch. Manual reference: 3406C: BASIC ENGINE, group 354-7530, page 83; C32: COOLING SYSTEM, group 417-3607, page 180.
2H3931 SEAL for Caterpillar C9 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement SEAL (Part # 2H3931). Designed for CAT C9, 3412C, 3406C, C32 equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C9, 3412C, 3406C, C32
- ✔ 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) | 2H3931 |
| Product Name | SEAL |
| Brand | CAT |
| Applicable Models | C9, 3412C, 3406C, C32 |
| Weight | 0.05 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 2H3931 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 |
| 3406C | BASIC ENGINE | 354-7530 | p.83 |
| C32 | COOLING SYSTEM | 417-3607 | p.180 |
| C9 | COOLING SYSTEM | 197-5988 | p.125 |
| 3412C | FUEL SYSTEM | 105-2939 | p.417 |
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.
System Notes — COOLING SYSTEM
The cooling system covers the radiator, water pump, thermostat, fan and fan drive, coolant hoses, clamps, the surge tank and the belts that drive it. It holds engine temperature inside the range where clearances and oil film stay correct. Failures are usually slow and then sudden: a hose softens and balloons before it bursts, a water pump seal starts weeping from the weep hole, a thermostat sticks partly open so the engine runs cold and burns more fuel. On construction sites the radiator also packs with dust and debris, which raises pressure across the core and finds the weakest hose or clamp first.
FAQ
Is 2H3931 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 C9.
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
