CAT 9S4188 PLUG for 3516B Caterpillar Part - WSTPARTS
WSTPARTS supplies the 9S4188 PLUG, a CAT Fitting replacement part designed for Caterpillar 3516B, 330C and 325C applications. It is categorized under Fitting. Every unit is fitment-verified before dispatch. Manual reference: 3406E: AIR INLET AND EXHAUST SYSTEM, group 123-6808, page 285; 3516B: COOLING SYSTEM, group 166-5931, page 393.
9S4188 PLUG for Caterpillar 3516B — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement PLUG (Part # 9S4188). Designed for CAT 3516B, 330C, 325C, 325D, 3406E, 320C, 320D equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 3516B, 330C, 325C, 325D, 3406E, 320C, 320D
- ✔ 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) | 9S4188 |
| Product Name | PLUG |
| Brand | CAT |
| Applicable Models | 3516B, 330C, 325C, 325D, 3406E, 320C, 320D |
| Weight | 0.18 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 9S4188 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 | AIR INLET AND EXHAUST SYSTEM | 123-6808 | p.285 |
| 3516B | COOLING SYSTEM | 166-5931 | p.393 |
| 325C | LUBRICATION SYSTEM | 194-1685 | p.81 |
| 325D | LUBRICATION SYSTEM | 231-7266 | p.64 |
| 330C | HYDRAULIC SYSTEM | 190-7702 | p.705 |
| 3616 | FUEL SYSTEM | 030-7951 | p.193 |
| 3406E | AIR INLET AND EXHAUST SYSTEM | 123-6808 | p.287 |
| 325C | HYDRAULIC SYSTEM | 177-2802 | p.755 |
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.
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 9S4188 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 3516B.
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
