The Crankaxle and flywheel are the core rotating assembly of the HOWO 7 6X4 Dump Truck engine, converting the reciprocating motion of the pistons into smooth rotational power. The crankshaft assembly, flywheel, and associated fastening and damping components work in unison to deliver reliable torque to the drivetrain. For a complete reference of all engine rotating and fastening parts, consult the Sinotruk Catalog which provides detailed cross-references and original equipment part numbers.
The Crankaxle and flywheel set includes the Crankshaft assembly, Hexagon head bolt, Oscillation absorber (Reference drawing R61540020003), Belt pulley (V-ribbed belt Transmitting ratio 3.39), Double stud, Hexagon head bolt, Hexagon nut type 1, Waveform elastic washer, Ball bearing, and Elastic snap ring for hole. Each component is precision-engineered to withstand the extreme loads and high rotational speeds of heavy-duty diesel operation.
The Crankaxle and flywheel assembly is manufactured to exacting OEM tolerances, with the crankshaft forged from high-strength steel and precision-ground for smooth journal surfaces. The flywheel provides inertia for uniform rotation, while the oscillation absorber dampens torsional vibrations, protecting the drivetrain from damaging harmonics.
Regular inspection and maintenance of the Crankaxle and flywheel components are essential for engine longevity. Worn bearings, loose fasteners, or a damaged absorber can lead to severe engine damage. Using genuine parts ensures that the assembly maintains its original balance and strength, reducing the risk of failure and extending the service life of the HOWO 7 6X4 Dump Truck.
The Crankshaft assembly is the main rotating shaft of the engine, converting the linear motion of the pistons into rotational torque. It is forged from high-strength alloy steel and features precision-ground main and connecting rod journals, with oil passages for lubrication. The crankshaft is dynamically balanced to minimize vibration and is designed to withstand the high peak pressures of the HOWO 7 6X4 diesel engine. It includes a rear flange for flywheel attachment and a front hub for the oscillation absorber and belt pulley, ensuring smooth power delivery to the drivetrain.
The Hexagon head bolt is a high-strength fastener used to secure the flywheel, oscillation absorber, and belt pulley to the crankshaft. Made from heat-treated chromium-molybdenum steel with a rolled thread, it provides superior clamp load and fatigue resistance. These bolts are designed for torque-to-yield application, ensuring consistent preload even under extreme thermal and mechanical cycling. They are coated with a micro-encapsulated lubricant to achieve accurate torque readings during installation.
The Oscillation absorber is a torsional vibration damper mounted on the front end of the crankshaft. It consists of a rubber element bonded between an inner hub and an outer inertia ring, tuned to absorb the resonant frequencies of the engine. This absorber effectively reduces harmful torsional vibrations that can cause crankshaft fatigue, gear noise, and accessory belt wear. It is a critical component for ensuring the long-term reliability of the Crankaxle and flywheel assembly in the HOWO 7 6X4 engine.
The Belt pulley is a precision-machined component that drives the engine accessories via a V-ribbed belt. It features multiple grooves to accommodate the belt and is balanced to minimize runout. The transmission ratio of 3.39 ensures that accessories such as the alternator, water pump, and air conditioning compressor operate at the correct speed. This pulley is bolted to the oscillation absorber and is designed for long wear life and reliable power transmission under heavy loads.
The Double stud is a threaded rod with threads on both ends, used to secure components such as the belt pulley or front covers to the crankshaft housing. It is made from medium-carbon steel and features a plain central section for alignment. The stud provides a strong, vibration-resistant connection and is often used with hexagon nuts to clamp accessories to the front of the engine, ensuring precise positioning and reliable fastening.
Another variant of the hexagon head bolt, used for mounting the flywheel and other heavy components. This bolt is made from the same high-quality alloy steel and features a slightly different length or thread pitch to match specific mounting points on the Crankaxle and flywheel assembly. Like the previous bolt, it is heat-treated and phosphate-coated for corrosion resistance and consistent torque retention, ensuring a secure joint that can withstand the high shear and tensile loads of the rotating assembly.
The Hexagon nut type 1 is a standard metric nut used in conjunction with the double stud to secure front-end components. It is made from carbon steel and is often zinc-plated to resist corrosion. This nut features a standard height and is designed to be tightened with a torque wrench to achieve the required clamp load. Its reliable locking action prevents loosening due to vibration, making it an essential fastening element in the Crankaxle and flywheel assembly.
The Waveform elastic washer is a spring steel washer with a wavy profile that provides a preload between bolted joints. It compensates for thermal expansion and thread settlement, maintaining a constant clamping force over time. This washer is used under hexagon head bolts and nuts to prevent self-loosening due to vibration, which is critical for the high-speed rotating components of the Crankaxle and flywheel assembly. Its elastic properties also help absorb shock loads, extending the life of the fasteners.
The Ball bearing is a precision rolling-element bearing that supports the front end of the crankshaft or auxiliary shafts. It consists of an outer ring, inner ring, and a set of steel balls held in a cage, providing low-friction rotation and high load-carrying capacity. In the context of the Crankaxle and flywheel assembly, this bearing may be used in the oscillation absorber or belt drive system, ensuring smooth operation and long service life with proper lubrication.
The Elastic snap ring for hole is a retaining ring that fits into a groove inside a bore to secure components such as ball bearings or shafts in place. Made from spring steel, it expands into the groove and provides a positive axial lock. This snap ring is essential for preventing bearing or shaft movement in the Crankaxle and flywheel assembly, ensuring that all rotating parts remain correctly aligned and axially located under all operating conditions.
| No. | Part No. | Description |
|---|---|---|
| 1 | 161560020029 | Crankshaft assembly |
| 2 | Q150B1070TF2 | Hexagon head bolt |
| 3 | VG1540020003 | Oscillation absorber (Reference drawing R61540020003) |
| 4 | VG1560020020 | Belt pulley (V-ribbed belt Transmitting ratio 3.39) |
| 5 | Q1201090F3 | Double stud |
| 6 | Q150B1085 | Hexagon head bolt |
| 7 | Q340B10 | Hexagon nut type 1 |
| 8 | Q41810 | Waveform elastic washer |
| 9 | 190003311416 | Ball bearing |
| 10 | Q43062 | Elastic snap ring for hole |
Premium forged steel and precision machining. Our crankshaft assembly is forged from high-strength alloy steel with induction-hardened journals, and all mating surfaces are precision-ground to exacting tolerances. This ensures minimal friction, excellent oil film retention, and outstanding durability under the high loads of the HOWO 7 6X4 engine.
Integrated torsional vibration control. The oscillation absorber is specifically tuned to the natural frequency of the crankshaft, effectively reducing harmful resonances that can lead to fatigue failure. This extends the life of the crankshaft, bearings, and accessory drive components, keeping your HOWO 7 6X4 running smoothly.
Complete fastening solution with high-grade hardware. Our sets include all hexagon head bolts, studs, nuts, washers, and snap rings, each manufactured from corrosion-resistant materials and heat-treated for maximum strength. This ensures a secure and durable assembly that withstands the extreme torque and vibration of heavy-duty operation.
Trusted by fleets and rebuilders globally. Our Crankaxle and flywheel components have been proven in the most demanding mining, construction, and transportation applications. Workshops rely on our consistent OEM quality to rebuild engines that deliver factory-fresh performance and reliability, mile after mile.
Our online catalog provides comprehensive access to genuine SINOTRUK parts for all major vehicle lines — including HOWO, Sitrak, Steyr, and Yellow River series trucks. You can browse detailed specifications, original part numbers, and exploded-view diagrams for every assembly. Whether you are performing routine maintenance or planning a major overhaul, the catalog helps you quickly identify the correct components for your vehicle. When you become a SINOTRUK customer, we offer complimentary full‑access catalog services, ensuring you always have the latest product data and interchangeability information at your fingertips to support efficient fleet management and accurate parts ordering.
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