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High Quality Dongfeng Truck Spare Parts 28v 70A AlternatorJFZ2707A 3972529

The Alternator (Part No. JFZ2707A) is an OEM-specified 28V/70A integrated AC generator designed primarily for Weichai (Weifang) medium- and large-displacement diesel engines used in heavy-duty commercial vehicles. As a core component of the vehicle’s electrical system, this alternator provides reliable charging power to the battery and supports all onboard 24V electrical loads—including ECUs, lighting, telematics, HVAC, and auxiliary systems—during engine operation.

Engineered for durability under extreme conditions such as high vibration, dust exposure, and thermal cycling, the JFZ2707A features reinforced construction, optimized cooling, and built-in electronic voltage regulation. It is widely installed across China’s leading truck platforms and is known for its stable output, excellent low-speed charging performance, and compatibility with modern electronically controlled chassis systems.

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Model:
JFZ2707A
Brand:
Dongfeng

Product Description

Attribute	Specification
Product Name	Alternator / Generator Assembly
Manufacturer	Weichai OEM; commonly produced by authorized suppliers such as Beijing Prestolite, Shanghai Valeo, or Weichai Electrical Systems
Primary Part Number	JFZ2707A
Alternative Names	AC Generator, Charging Dynamo, 24V Truck Alternator
Voltage Output	28V DC regulated (for 24V nominal vehicle system)
Rated Current	70A (max ~2000W output at full load)
Regulator Type	Internal IC-controlled electronic regulator
Rotation Direction	Clockwise (viewed from pulley end)
Cooling Method	Dual internal fans for forced air cooling
Mounting Style	Bracket-mounted with adjustable tensioning
Application Class	Heavy-Duty Commercial Trucks & Buses

Parameter	Value / Detail
Rated Voltage	28V ±1.5V (regulated output)
Maximum Output Current	70A at 5,000 RPM
Idle Charging Performance	Begins effective charge at ~1,000 RPM (optimized for low-speed operation)
Pulley Type	Multi-ribbed belt (typically 8PK; some variants use 10PK)
Bearing System	Reinforced sealed ball bearings (front & rear)
Rectifier Bridge	Full-wave diode rectifier with overcurrent protection
Field Diodes	Integrated into rectifier assembly
Cooling Design	Dual internal aluminum impellers for enhanced airflow
Weight	6.5 – 8.0 kg (14.3 – 17.6 lbs)
Operating Temperature Range	-40°C to +120°C (-40°F to +248°F)
Protection Features	Over-voltage, short-circuit, reverse polarity protection (via design)