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- Wanda Plaza, Jinan, Shandong, China
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The WEICHAI WP12 Tensioner And Belt Assembly is a precision-engineered automatic belt tensioner and multi-rib serpentine belt kit designed specifically for the front-end accessory drive system of WP12 heavy-duty diesel engines. As genuine WEICHAI Engine Parts, this tensioner and belt assembly maintains optimal belt tension automatically across all WP12 variants from 336 HP to 550 HP. The WEICHAI WP12 Tensioner And Belt Assembly features a maintenance-free, low-noise design with high-precision wear-resistant shaft sleeve materials, plane spring torsion structure, double-row deep groove ball bearings, and optimized damping parameters with a newly added dust cover, greatly improving product recovery performance and reliability.
The WEICHAI WP12 Tensioner And Belt Assembly is an integrated automatic belt tensioner paired with a high-quality multi-rib serpentine belt that drives all engine accessories including the alternator, power steering pump, water pump, fan, and air conditioning compressor. The tensioner consists of a fixed casing, tensioner arm, wheel body, torsion spring, rolling bearing, and spring bushing, working together to maintain consistent belt tension throughout engine operation.
The WEICHAI WP12 Tensioner And Belt Assembly utilizes advanced automatic tensioning technology. When the engine operates under different conditions such as low-speed startup, high-speed operation, or heavy-load climbing, the tensioner intelligently adjusts to keep the drive belt at proper tension. If tension is too high, wear increases; if too low, slippage or even belt breakage may occur. This automatic adjustment prevents both conditions, ensuring reliable power transmission.
The WEICHAI WP12 Tensioner And Belt Assembly is part of the engine’s automatic tensioning front wheel train, which achieves a belt service life of 10,000 hours under normal operating conditions. The tensioner features maintenance-free operation with lifetime lubricated ball bearings and double high-temperature seals to assure peak bearing performance. The flat steel pulley contains a specially formulated e-coating that resists corrosion and wear in harsh environments, meeting or exceeding OE quality standards.
Applications for the WEICHAI WP12 Tensioner And Belt Assembly include Shacman X3000/F3000/X5000, Sinotruk HOWO A7/T7H, Beiben trucks, Hongyan vehicles, JAC trucks, CAMC vehicles, Yutong buses, Kinglong buses, and SDLG wheel loaders. Common OEM part numbers for the tensioner include 612630060003 (WP12 Euro III), 612630060009, 1000694241 (for Euro IV/V), 612600061256, 612630061185, and 612630060972. For the multi-rib belt, common part numbers include 612600061464, 612630060974, 612630060011 (generator belt 6PK1462), and 612700060025 (fan belt 10PK1287).
Counterfeit tensioners often use inferior materials and lack proper heat treatment or bearing seals, leading to premature failure, belt noise, and accessory drive issues. Always source genuine WEICHAI WP12 Tensioner And Belt Assembly components from authorized distributors to ensure proper fitment, reliable tension control, and long-term durability. The WP12 engine platform has undergone over 45,000 hours of cumulative bench testing and over 50 million kilometers of road testing, proving the reliability of every tensioner and belt component.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 612630060003 | Automatic Belt Tensioner (WP12 Euro III, Auman GTL, SHACMAN, JAC, CAMC, Yutong, Kinglong, 272mm height) |
| 2 | 612630060009 | Belt Tensioner (WP12 Euro III, SHACMAN F2000/F3000, AUMARK replacement) |
| 3 | 1000694241 | Automatic Tensioner (WP12/WP13 Euro IV/V, 12PK fan belt tensioner, for Shacman, Foton, JAC) |
| 4 | 612600061256 | Belt Tensioner Pulley (WP12/WP10, maintenance-free bearing, double high-temperature seals) |
| 5 | 612630061185 | Automatic Tensioner (WP12, Foton Auman, with aluminum + steel construction) |
| 6 | 612630060972 | Automatic Tensioner (WP12/WP13, original factory fitment, intelligent tension adjustment) |
| 7 | 612600061464 | Multi-Rib Serpentine Belt (WP10/WP12, universal accessory drive belt) |
| 8 | 612630060974 | Multi-Rib Serpentine Belt (WP12, for Jiefang J7/J6P/FAW applications) |
| 9 | 612630060011 | Generator Belt (6PK1462, 6-rib, 1462mm effective length, alternator drive) |
| 10 | 612700060025 | Fan Belt (10PK1287, 10-rib, 1287mm effective length, main cooling fan drive) |
The table above lists common service parts for the WEICHAI WP12 Tensioner And Belt Assembly. When replacing the tensioner, always inspect the belt routing diagram and verify the correct belt length and rib count (6-rib for generator, 10-rib for fan, or multi-rib for integrated accessory drive). The tensioner is manufactured with high-precision wear-resistant shaft sleeve materials and double-row deep groove ball bearings. The automatic tensioner has the advantages of maintenance-free, low noise, compact structure and convenient maintenance.
The WEICHAI WP12 Tensioner And Belt Assembly features a maintenance-free automatic tensioner with lifetime lubricated ball bearings, eliminating the need for periodic manual belt tension adjustments. The plane spring torsion structure and optimized damping parameters provide consistent tension across the entire engine operating range from idle to 2100 RPM.
The automatic tensioning front wheel train of the WP12 engine achieves a belt service life of 10,000 hours under normal operating conditions, significantly reducing maintenance frequency and downtime. The WEICHAI WP12 Tensioner And Belt Assembly is designed to maintain optimal belt tension throughout this extended service interval.
The tensioner pulley features a flat steel construction with a specially formulated e-coating comparable to OE plating, providing superior corrosion resistance and wear resistance under harsh environments. Double high-temperature seals protect the bearing from contamination, ensuring peak bearing performance in all conditions.
No modifications required for WP12 engines in Shacman, Sinotruk, Beiben, Hongyan, JAC, CAMC, Yutong, Kinglong, SDLG, and XCMG applications. Available for both Euro III (612630060003) and Euro IV/V (1000694241) variants, with belt options for generator (6PK1462) and fan (10PK1287) drives.
Each WEICHAI WP12 Tensioner And Belt Assembly undergoes rigorous quality control including tension parameter calibration, bearing smoothness verification, dust cover integrity testing, and simulated durability testing. IATF 16949 certified quality with unique serial number traceability for each unit.
Worldwide shipping from regional warehouses. Free belt routing diagrams, tensioner installation torque specifications (retaining bolt to 35-45 N·m), and troubleshooting guides provided with each order. Volume discounts available for fleet customers and engine rebuilders.
Unlike aftermarket tensioners that use substandard bearings and lack proper dust protection, our genuine WEICHAI WP12 Tensioner And Belt Assembly is manufactured to original equipment specifications with high-precision wear-resistant shaft sleeve materials and double-row deep groove ball bearings. The addition of a dust cover greatly improves product recovery performance and reliability, making the engine front-end pulley train more stable and reliable while extending belt life.
The tensioner is constructed with a cast iron housing (HT200 gray cast iron for heavy-duty variants) or lightweight aluminum construction for weight-sensitive applications. The torsion spring is manufactured from 60Si2Mn alloy steel with automatic wear compensation functionality, ensuring consistent tension range of 80-120N throughout the service life. The tensioner operates reliably in ambient temperatures from -40°C to 120°C and speeds from 600 to 2800 RPM.
Technical support includes tensioner and belt assembly installation procedures: locate tensioner on engine front or side, insert 3/8-inch square-drive ratchet into tensioner arm, pivot tensioner to release belt tension, remove old belt, replace tensioner retaining bolt (torque to 35-45 N·m), route new belt according to diagram, release tensioner slowly to engage belt, and verify belt alignment and tension. Troubleshooting guides for symptoms like belt squeal (worn tensioner or misaligned pulley), belt chirp (bearing wear), and belt wear (incorrect tension) are provided.
For fleets, sample testing is available. Order one WEICHAI WP12 Tensioner And Belt Assembly for trial; volume pricing applies. Many customers report over 500,000 km trouble-free accessory drive operation after replacing worn original components with our genuine tensioner and belt assemblies. We provide cross-reference support for part number verification based on your engine serial number and accessory drive configuration.
Also monitor accessory drive performance during operation. If the battery charging warning light illuminates at idle but goes away at higher RPM, the belt may be slipping due to insufficient tension from a worn tensioner. If the power steering becomes heavy at low engine speeds, check belt tension. If the engine temperature rises above normal, inspect the fan belt tension—a slipping belt will under-drive the water pump and fan, causing overheating.
For severe-duty applications (mining, construction, heavy haul, marine), reduce inspection intervals to every 25,000 km (15,000 miles) or 250 operating hours. High ambient temperatures, dust, and frequent stop-start cycles accelerate belt wear and tensioner spring fatigue. Marine applications require additional corrosion checks—saltwater environments can accelerate rust on the tensioner pulley and bracket.
When installing a new WEICHAI WP12 Tensioner And Belt Assembly, ensure that the tensioner is properly seated with the aligning dowel inserted into the engine mounting hole. Use the correct tool (3/8-inch square-drive ratchet or serpentine belt tool) to pivot the tensioner when routing the belt. After installation, start the engine and observe belt tracking—the belt should run centered on all pulleys without wandering. If the belt tracks off-center, check tensioner alignment and pulley condition.
Maintain a logbook of all accessory drive maintenance: dates of belt and tensioner inspections, belt replacement intervals, tensioner operation checks, noise observations, and any abnormal findings. For fleet operators, tracking belt wear progression and tensioner bearing noise is a powerful predictive maintenance tool—bearing noise typically develops gradually over thousands of kilometers, providing ample warning before catastrophic failure occurs.
In summary, the WEICHAI WP12 Tensioner And Belt Assembly features maintenance-free automatic tensioner design, 10,000-hour belt service life, and corrosion-resistant e-coated pulley construction. Whether you are rebuilding a Shacman X3000, Sinotruk HOWO, Beiben truck, Yutong bus, SDLG wheel loader, or marine vessel, choosing a genuine tensioner and belt assembly directly impacts accessory drive reliability, belt longevity, and overall engine performance.
For workshops performing in-frame overhauls, we recommend ordering the WEICHAI WP12 Tensioner And Belt Assembly as a complete kit including tensioner (612630060003 or 1000694241), serpentine belt (612600061464), generator belt (6PK1462), and fan belt (10PK1287) as required by the specific vehicle configuration. This approach eliminates hidden failures and gives your customer a worry-free warranty period. The tensioner is pre-inspected for bearing smoothness, spring tension calibration, and dimensional accuracy before shipment.
Our inventory includes both Euro III tensioners (612630060003, 612630060009) and Euro IV/V tensioners (1000694241, 612630060972) to cover all WP12 engine vintages. For belts, we stock the universal multi-rib belt (612600061464) as well as the specific generator belt (6PK1462) and fan belt (10PK1287). We provide cross-reference support for part number verification—please provide your engine serial number for accurate matching.
We provide after-sales documentation including belt routing diagrams, tension calibration certificates, bearing specifications, material certifications, and installation torque specifications upon request. Every WEICHAI WP12 Tensioner And Belt Assembly component is packaged in protective foam-lined boxes to prevent damage during shipping. Bulk orders receive custom palletizing and export documentation assistance.
All specifications based on original WEICHAI WP12 engine data. Cross-check part numbers with engine serial number and accessory drive configuration. The WEICHAI WP12 Tensioner And Belt Assembly includes OEM references 612630060003 (Euro III), 612630060009, 1000694241 (Euro IV/V), 612600061256, 612630061185, and 612630060972. Belt references: 612600061464 (universal), 612630060974, 612630060011 (6PK1462 generator belt), 612700060025 (10PK1287 fan belt). Always torque tensioner retaining bolt to 35-45 N·m, follow belt routing diagram, and verify belt alignment after installation.
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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.
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