2128561 Alternator 24V 50A for Caterpillar 320C 320D Excavator

Product Overview

This 2128561 alternator is built as a direct replacement for Caterpillar 3066 and C6.4 diesel engines, most commonly installed on CAT 320C, 320D and 321C hydraulic excavators. It is manufactured to match OEM mounting dimensions, electrical output and durability standards, and serves as a reliable spare part for equipment maintenance, repair and overhaul in construction, mining and earthmoving operations.

Every unit completes full load testing, voltage regulation testing and insulation inspection before shipment, to ensure stable power supply for on-board electrical systems including control modules, lighting, starter circuits and auxiliary attachments. It is engineered for heavy-duty job site conditions with enhanced heat dissipation and corrosion resistance.

Full Specifications

Compatibility List

Engine Models

• Caterpillar 3066 diesel engine

• Caterpillar C6.4 diesel engine

Excavator Models

• CAT 320C / 320C L track excavator

• CAT 320D / 320D L / 320D GC track excavator

• CAT 321C track excavator

This unit replaces multiple cross-reference part numbers. Please confirm your original part number or machine serial number before ordering. We can help verify compatibility upon request.

Product Features

• Precision machined mounting brackets for perfect alignment with engine mounting points, plug-and-play installation

• High-purity copper winding and premium rectifier components for stable output and low voltage fluctuation

• Reinforced cooling fan design for improved heat dissipation under long-time high load operation

• Corrosion-resistant housing and coated metal parts to withstand dust, moisture and harsh job site environments

• 100% functional testing before delivery to ensure consistent performance out of the box

Order & Support

We supply this aftermarket alternator for equipment maintenance and repair projects. Orders are produced and inspected strictly according to the part number and machine model you require. Both sample orders and bulk quantity orders are accepted. We can arrange shipping by sea, air or international express to match your delivery schedule.

If you need other engine electrical parts or undercarriage / hydraulic parts for Caterpillar equipment, you may send us your full parts list for a consolidated quotation.