CAT 9R3924 BOSS for 365B Caterpillar Part - WSTPARTS
WSTPARTS supplies the 9R3924 BOSS, a CAT Structure replacement part designed for Caterpillar 365B, 330C and 325C applications. It is categorized under Structure. Every unit is fitment-verified before dispatch. Manual reference: 365B: FUEL SYSTEM, group 138-5596, page 116; 325C: FUEL SYSTEM, group 177-5816, page 159.
9R3924 BOSS for Caterpillar 365B — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement BOSS (Part # 9R3924). Designed for CAT 365B, 330C, 325C, 320C, 345B equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 365B, 330C, 325C, 320C, 345B
- ✔ 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) | 9R3924 |
| Product Name | BOSS |
| Brand | CAT |
| Applicable Models | 365B, 330C, 325C, 320C, 345B |
| Weight | 0.09 kg |
| Condition | New (Genuine CAT / OEM-equivalent direct replacement) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 9R3924 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 |
| 365B | FUEL SYSTEM | 138-5596 | p.116 |
| 325C | FUEL SYSTEM | 177-5816 | p.159 |
| 330C | FUEL SYSTEM | 190-6920 | p.161 |
| 345B | FRAME AND BODY | 126-6323 | p.337 |
| 330C | FUEL SYSTEM | 184-9066 | p.179 |
| 345B | FRAME AND BODY | 141-6475 | p.345 |
| 365B | FRAME AND BODY | 208-1898 | p.327 |
| 330C | FUEL SYSTEM | 236-6465 | p.181 |
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 — FRAME AND BODY
The frame and body group covers the main frame, counterweight, fenders, steps, handrails, access doors, panels and the mounting hardware that ties them together. It carries every load the machine generates and every load the attachment imposes back into the structure. Cracks almost always start at a weld toe or a bolt hole where a mounting has worked loose, and a loose guard or step is both a structural and a safety issue. Parts in this group are replaced after impact damage, after crack repair, or when fasteners no longer hold torque because the hole has elongated.
FAQ
Is 9R3924 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 365B.
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
