C4.4 C6.6 C7.1 Alternator Pulley 321-6131 Heavy Equipment CAT 416F2 420F Excavator Engine Part
The 321-6131 alternator pulley enables the alternator to rotate via drive belts, which are driven by the engine accessory drive system. The structure is dynamically balanced to effectively reduce operating vibration and belt wear, thus improving overall machine stability.
CAT 321-6131 Alternator Pulley Specifications
| State |
Brand New |
| Product Name |
Alternator Pulley |
| Part Number |
321-6131 |
| Height |
45.7mm |
| Width |
96.5mm |
| Length |
96.5mm |
| Number of Grooves |
8 |
| Material |
Alloy Steel, Gray (Flake) Iron |
| Minimum Order Quantity |
1 Piece |
| Payment Method |
Western Union, T/T |
| Shipping Method |
UPS/DHL/EMS/TNT/FedEx |
Compatible Models
Engine: C6.6 C7.1 C4.4
Excavator: 416F2 420F2 428F2 432F2 434F 444F 432F 430F2 420F 430F 444F2 440 450F 450 428F 416F 434F2
Features and Advantages
High-strength Metal Material: Improves wear resistance and service life
Dynamic Balance Design: Reduces vibration during high-speed operation
High Temperature Resistance: Adapts to the high-temperature environment of the engine compartment
Improved Transmission Efficiency: Ensures stable generator output
Actual photos of the CAT 321-6131 alternator pulley from various angles.


Guangzhou Minshun Machinery Equipment Co., Ltd.
We specialize in the sales and service of diesel engine assemblies and construction machinery parts. Our product line covers engine assemblies, filtration systems, electronic control components, hardware accessories, wiring harnesses, and electrical accessories. Our service area includes Canada, the United States, the United Kingdom, Mexico, the Netherlands, Kazakhstan, Mongolia, Russia, Australia, Malaysia, Turkey, Indonesia, Singapore, Thailand, South America, South Africa, and other countries and regions.
Our Product Range
| Engine Rebuild Kit |
Turbochargers |
Engine Diesel Pumps |
Engine Controllers (ECU) |
| Cylinder Blocks |
Cylinder Heads |
Water Pumps |
Injectors |
| Starter Motors |
Filters |
Other Engine Accessories |
Excavator Hydraulic Pumps |
| Swivel Components |
Distributor Valves |
Travel Motor Assemblies |
Chassis Components and Other Accessories |


Frequently Asked Questions
Q1: What is your main products?
A1: We are specialized in the excavator engine spare parts, for example Main cylinder block, cylinder head, crankshaft, Engine assembly, piston, cylinder liner, piston ring, camshaft, connecting rod, oil pump, water pump, valve series products, movement, etc. almost all parts of the entire engine.
Q2: Do you test all products before shipping?
A2: Yes, we conduct 100% testing before shipping.
Q3: Which engine models is this Alternator Pulley compatible with?
A3: This product is designed for specific diesel engine models. If you can provide the engine model or original part number, we can confirm compatibility before shipping to avoid incompatibility issues.
Q4: What are the symptoms of a damaged alternator pulley?
A4: If this pulley (321-6131) experiences groove wear, abnormal noise, or belt vibration, it will directly lead to insufficient alternator output power and accelerate the premature failure of the transmission system.
Q5: What is the function of an alternator pulley?
A5: The alternator pulley, by matching the speed ratio with the engine crankshaft, efficiently converts mechanical energy into electrical energy. Through its groove design or unidirectional drive mechanism, it ensures power stability and vibration damping of the transmission system at high speeds.
Why Choose Us?
• Over 20 years of focus on construction machinery – offering a full range of excavator assemblies and accessories.
• Get a Quote – Our professional team will provide you with a quote immediately upon receiving your requirements.