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- Wanda Plaza, Jinan, Shandong, China
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The WEICHAI WP12 Generator Group is a high-efficiency charging system assembly engineered specifically for the WP12 diesel engine platform. This complete assembly generates electrical power to maintain battery charge and supply vehicle electronics while the engine is running. Proper charging system function is essential for starting reliability and electrical component performance, and the WEICHAI WP12 Generator Group provides fleet operators and technicians with an OEM-grade solution for maintaining reliable electrical output. For genuine replacement parts and comprehensive engine service components, always source from verified WEICHAI Engine Parts to guarantee OEM fitment, consistent quality, and long-term reliability.
The WEICHAI WP12 Generator Group, commonly referred to as the charging alternator, is a belt-driven AC generator mounted on the engine block that converts mechanical energy from the crankshaft into electrical energy. This assembly is responsible for maintaining battery voltage (typically 24V DC for heavy-duty applications) and supplying power to the engine’s electrical systems, including the ECU, fuel injection system, lights, wipers, and climate control. The alternator is driven by the engine’s serpentine belt or dual V-belts and produces three-phase AC current that is rectified to DC by an internal diode bridge before being regulated to a stable output voltage.
The generator group comprises several key components: the stator assembly (stationary windings), rotor assembly (rotating electromagnet), rectifier diode bridge, voltage regulator, pulley, cooling fan, and the aluminum housing that encloses all components. The rotor is energized by a small current through the slip rings, creating a magnetic field that induces alternating current in the stator windings as the rotor spins. The rectifier diodes convert this AC to DC, while the voltage regulator (either internal or external to the alternator) monitors system voltage and adjusts rotor excitation current to maintain a stable output between 27.2V and 28.8V on 24V systems.
The WEICHAI WP12 Generator Group is designed for the 11.596-liter inline-six WP12 engine used in heavy trucks (HOWO T7H, SHACMAN Delong F3000, FOTON Auman, Jiefang), construction machinery (loaders, excavators, bulldozers), marine propulsion, and stationary generator sets. The assembly is compatible with all WP12 variants from Euro III through Euro V emission standards, as well as China VI engines. The alternator is side-mounted on the engine block using a heavy-duty cast bracket with rubber vibration isolators, and the pulley configuration (typically 6-groove or 8-groove multi-rib belt, or dual B-type V-belts) is matched to the WP12’s front-end accessory drive system.
The WEICHAI WP12 Generator Group is available in multiple output ratings to match different application requirements. Standard truck applications use a 28V 70A alternator (OEM 612630060248). Heavy-duty applications (construction, mining, heavy towing) use higher-output units such as the 24V 140A alternator (OEM 612630060348) or 24V 150A alternator (OEM 1000130827/0124655643/0124655644). For generator set applications where the engine runs at constant speed, the alternator is configured with a dedicated drive system and may include additional cooling features to handle continuous operation at rated output.
The generator group operates on a 24V DC electrical system, with the battery voltage typically ranging from 12.0V (engine off) to 28.8V (alternator charging at full output). The alternator is protected by the vehicle’s electrical system fuses or circuit breakers, and the main positive output cable is connected directly to the battery positive terminal through a fusible link or mega-fuse. The generator’s housing is grounded to the engine block, providing the return path for the charging current.
Every genuine WEICHAI WP12 Generator Group undergoes 100% functional testing, including output voltage regulation, diode rectifier integrity, and bearing noise verification. Counterfeit alternators often use undersized copper windings, poor-quality rectifier diodes, or low-grade bearings that fail prematurely, leading to undercharging, battery drain, and electrical system malfunctions. Always source from authorized distributors to guarantee proper output, reliability, and protection against electrical fires.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 1002050761 / 612600091115 / 8600595 / 612630060694 / 1000750099\\n | Complete Alternator Assembly (Multiple Output Versions, WP12 Engine) |
| 2 | 612630060248 | Alternator Assembly (28V 70A, 6PK Belt, Standard Truck Application) |
| 3 | 612630060348 | Alternator Assembly (24V 140A, Heavy-Duty Truck & Construction Machinery) |
| 4 | 0124655643 / 1000130827 | Alternator Assembly (24V 150A, Premium High-Output for Marine & Mining) |
| 5 | 612600091115 / 8600595 | Alternator Assembly (OEM Cross-Reference for WP12/WP13, Shacman Chassis) |
| 6 | 612630060790 | Alternator Assembly (WP8 Series, Cross-Compatible with WP12 Drive Configuration) |
| 7 | 612600090206D | Alternator Assembly (24V 70A, Light-Duty WP12 Engine Variant) |
| 8 | 612630060038 / 1611611-00263-001 | Generator Support / Mounting Bracket (Cast Aluminum, WP12 Side-Mount) |
| 9 | 612640060245 | Alternator Mounting Bracket (Heavy-Duty, WP13/WP12 Common Platform) |
| 10 | 612600090352 / 612600090353 | Alternator Assembly (WD615 Series, Compatible with WP12 Electrical System) |
Our WEICHAI WP12 Generator Group uses 100% copper stator and rotor windings, not aluminum or copper-clad aluminum. Full copper windings provide lower electrical resistance, better heat dissipation, and longer service life. Counterfeit alternators often use aluminum windings that overheat and fail under sustained heavy electrical loads.
We stock multiple output ratings to match your specific application: standard 70A for highway trucks, 140A for construction equipment with multiple auxiliary loads, and 150A for marine and mining applications where high electrical demand is constant. The WEICHAI WP12 Generator Group delivers stable charging even at idle speeds, ensuring battery voltage remains within the optimal range.
Each alternator features an internal solid-state voltage regulator that maintains output voltage within ±0.5V of the target setting, preventing overcharging (which damages batteries) and undercharging (which causes starting problems). The regulator includes over-voltage protection that shuts down output if voltage exceeds 32V.
Our alternators are manufactured using original WP12 engine mounting specifications, ensuring bolt holes align perfectly with the cast-aluminum generator support bracket. The pulley groove count (6PK or dual V-belt) matches the WP12’s front-end accessory drive, eliminating belt tracking issues.
Each WEICHAI WP12 Generator Group includes the mounting bolts, adjusting bracket, and belt tension reference instructions. We provide torque specifications (lower bolt 55-65 N·m, upper adjusting bolt 40-50 N·m) and belt deflection guidelines (10-15 mm of travel under moderate thumb pressure).
We stock complete generator assemblies and individual components in warehouses across Asia, Europe, and the Americas. Express shipping options minimize downtime for fleet operators. Technical support includes wiring diagrams, diagnostic procedures, and troubleshooting guides for common charging system faults.
Unlike generic aftermarket alternators that use undersized bearings and poor-quality rectifier diodes, our WEICHAI WP12 Generator Group is manufactured to original equipment specifications. The rectifier diode bridge uses avalanche-type diodes rated for 200A peak current, providing protection against voltage spikes from load dump events. The bearings are sealed, double-row units pre-lubricated with high-temperature grease, rated for over 10,000 hours of continuous operation.
Furthermore, our alternators feature an internal cooling fan integrated into the rotor, pulling air through the housing to dissipate heat from the stator windings and rectifier diodes. The aluminum housing includes cooling fins on the rear face, and the voltage regulator is mounted on a heat sink to maintain regulation accuracy even at full output in high-ambient-temperature conditions (up to 105°C engine compartment temperature).
Technical documentation included with the WEICHAI WP12 Generator Group provides correct belt tensioning procedures (belt deflection of 10-15 mm under moderate thumb pressure), pulley alignment verification (use a straightedge to check coplanarity), and a troubleshooting guide for common issues such as low output voltage (check belt tension and battery connections), no output (check field excitation circuit and voltage regulator), and excessive noise (check bearings and pulley alignment).
For large fleet customers, we offer sample evaluation: order one WEICHAI WP12 Generator Group for trial installation. After validation, volume pricing applies. Many return customers report that our alternators exceed the original equipment service life, with over 500,000 km of reliable operation, compared to low-cost alternatives that often fail within 100,000 km due to rectifier diode failure or bearing seizure.
Beyond the checklist above, pay attention to any electrical symptoms such as dimming headlights at idle, erratic gauge readings, or slow cranking when starting. These symptoms often precede complete alternator failure and provide early warning of charging system problems. Address them immediately to prevent battery depletion and roadside breakdowns.
For engines operating in extreme conditions (desert environments, continuous high-load operation, frequent short trips), consider more frequent alternator inspections every 50,000 km. High ambient temperatures accelerate bearing grease breakdown and diode thermal stress. For marine applications, inspect the alternator annually for saltwater corrosion, paying special attention to the rectifier diode pack and the B+ terminal area. Replace the alternator every 4,000 operating hours as preventive maintenance in severe marine service.
When replacing a failed alternator, always install a new drive belt and inspect the belt tensioner and idler pulley bearings at the same time. A worn tensioner can apply uneven load to the new alternator’s bearings, causing premature failure. Use only the correct output rating for your application — installing a lower-output alternator than specified will result in chronic undercharging; installing a higher-output alternator than specified will not harm the system as long as the wiring is adequate, but may require a larger gauge B+ cable.
Finally, maintain a service log for the WEICHAI WP12 Generator Group recording installation dates, belt tension readings, voltage measurements, and any observed symptoms. This data helps predict when components are approaching end of life. For fleet operators, standardized replacement of alternators every 400,000 km eliminates charging system-related breakdowns and protects batteries from chronic undercharging or overcharging damage.
In summary, the WEICHAI WP12 Generator Group is the heart of the WP12 engine’s electrical charging system. Its robust copper windings, precision voltage regulation, and high-quality bearings ensure reliable battery charging and electrical supply for hundreds of thousands of kilometers. Whether you are replacing a failed alternator on a HOWO T7H tractor, maintaining a fleet of SHACMAN Delong F3000 dump trucks, or servicing a WP12 marine propulsion engine, using a genuine generator group ensures that your vehicle’s electrical system remains fully functional and your batteries stay properly charged.
For workshops performing electrical system diagnosis, we recommend ordering the WEICHAI WP12 Generator Group together with a new drive belt, belt tensioner inspection, and battery load testing. The alternator is the most critical component of the charging system; renewing it with a genuine unit eliminates charging-related variables during diagnosis. We provide installation guides with torque specifications, belt tension procedures, and charging system diagnostic flowcharts for all WP12 engine variants.
Our inventory includes both standard-output alternators (70A) for highway trucks and high-output versions (140A or 150A) for construction, mining, marine, and heavy-towing applications. For generator set applications where the engine runs at constant speed, we offer alternators with enhanced cooling and extended bearing life ratings. Specify your application and electrical load requirements when ordering to receive the appropriate output rating.
We also provide after-sales documentation including output test reports, diode rectifier integrity certificates, and bearing runout inspection data upon request. Every WEICHAI WP12 Generator Group is packaged in a foam-lined box with protective terminal covers to prevent damage during transit. Bulk orders receive custom export crating and documentation.
All specifications are based on original WEICHAI WP12 engine data. Actual product configurations may vary by sub-model (Euro III, Euro V, marine, construction, etc.). Always verify part numbers and output rating against your engine’s serial number plate before ordering.
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If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
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