CAT 4B4277 WASHER for 3306 Caterpillar Part - WSTPARTS
WSTPARTS supplies the 4B4277 WASHER, a CAT Bolt/Nut replacement part designed for Caterpillar 3306 and 3056E applications. It is categorized under Bolt/Nut. Every unit is fitment-verified before dispatch. Manual reference: 3056E: FUEL SYSTEM, group 217-0109, page 121; 3306: OPERATOR STATION, group 200-5220, page 1773.
4B4277 WASHER for Caterpillar 3306 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement WASHER (Part # 4B4277). Designed for CAT 3306, 3056E equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT 3306, 3056E
- ✔ 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) | 4B4277 |
| Product Name | WASHER |
| Brand | CAT |
| Applicable Models | 3306, 3056E |
| Weight | 0.05 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 4B4277 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 |
| 3056E | FUEL SYSTEM | 217-0109 | p.121 |
| 3306 | OPERATOR STATION | 200-5220 | p.1773 |
| 3056E | FUEL SYSTEM | 228-8965 | p.125 |
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 — OPERATOR STATION
The operator station covers the cab structure, seat and suspension, glass, wipers, door hardware, pedals, joysticks, armrests, HVAC ducting and the interior trim. It is the group that decides how tolerable a ten-hour shift feels. Wear here is driven by daily entry and exit, sun exposure and dust: seat suspensions sag, door struts lose charge, wiper linkages seize, and rubber seals harden until the cab leaks in rain. Parts in this group are replaced when a control feels vague, a latch no longer holds, or the cab no longer keeps dust and water out — small items, but the ones operators complain about first.
FAQ
Is 4B4277 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 3306.
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
