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The genuine ZF steering gear with OEM number 1316303005 represents the pinnacle of steering technology for SINOTRUK Sitrak heavy-duty trucks. Engineered by ZF Friedrichshafen, one of the world’s leading automotive suppliers, this recirculating-ball steering gear delivers exceptional precision, effortless handling, and uncompromised durability. As a premium component within the Sinotruk sitrak parts portfolio, the 1316303005 ZF steering gear guarantees factory-grade performance, seamless integration, and the renowned reliability that ZF technology is known for worldwide.
The 1316303005 ZF steering gear is the result of decades of steering system expertise from ZF, a brand synonymous with innovation and reliability in commercial vehicle technology. Unlike generic aftermarket units, this steering gear features a precision-engineered recirculating-ball design with a hardened worm shaft, high-capacity ball nuts, and a meticulously machined sector shaft. These components work in perfect harmony to deliver smooth, responsive steering with minimal free play, ensuring that the driver maintains precise control even under the most demanding conditions.
Extensive real-world testing on SINOTRUK Sitrak C7H and C9H chassis has confirmed that the genuine 1316303005 steering gear reduces steering system failures by over 70% compared to non-OEM alternatives. Its optimized internal geometry and advanced sealing technology ensure consistent hydraulic power assistance and prevent fluid leaks, even under sustained high-pressure operation. For fleet operators, this translates into fewer roadside incidents, lower maintenance costs, and improved driver satisfaction across long-haul and heavy-duty applications.
ZF’s advanced hydraulic assistance reduces steering effort by up to 35%, minimizing driver fatigue during urban deliveries and tight maneuvering.
Quad-ring seals with integrated dust excluders provide exceptional protection against contamination and fluid loss, ensuring long-term reliability.
Precision-tuned torsion bar delivers consistent steering torque across all speed ranges, from parking lot to highway cruising.
| Parameter | Specification |
|---|---|
| OEM Number | 1316303005 |
| Product Type | ZF Recirculating Ball Hydraulic Steering Gear |
| Brand | ZF / SINOTRUK Sitrak Original Equipment |
| Application | Sitrak C7H, C9H, A7, TX series, Howo T7 |
| Steering Ratio | 21.8 : 1 (variable ratio) |
| Max. Input Torque | 360 Nm |
| Max. Output Torque | 6,800 Nm |
| Hydraulic Pressure | 12.5 – 14.5 MPa (working) |
| Flow Rate | 8 – 12 L/min |
| Operating Temperature | -40°C to +125°C |
| Weight | 24.2 kg (approx.) |
When replacing the steering gear with the genuine 1316303005 ZF unit, always disconnect the battery and relieve hydraulic system pressure before beginning. Use new O-rings and sealing washers to ensure leak-free connections. Torque the mounting bolts to 205 Nm and the pitman arm nut to 415 Nm as specified in ZF and Sinotruk service documentation. After installation, fill the system with ZF-approved hydraulic fluid (such as ZF Ecofluid or Dexron III) and bleed the system thoroughly by turning the steering wheel lock-to-lock with the engine idling until all air bubbles are expelled.
Regular maintenance should include checking for fluid leaks, inspecting the dust cover for cracks, and verifying the torque of the pitman arm nut every 50,000 km. Using the genuine 1316303005 ZF steering gear ensures that the steering column angle and universal joint alignment remain within factory tolerances, preventing premature wear of the intermediate shaft and reducing overall steering system vibration.
Every 1316303005 ZF steering gear is manufactured in IATF 16949 certified facilities, with 100% final testing on ZF’s proprietary hydraulic test benches. Each unit undergoes leak testing, internal pressure validation, steering torque measurement, and endurance simulation to ensure it meets ZF’s stringent quality standards. The housing is constructed from high-strength ductile iron (GGG-50) and coated with a corrosion-resistant paint that withstands over 1,000 hours of salt spray testing. Counterfeit gears often use inferior materials and lack proper heat treatment; the genuine 1316303005 guarantees safety, durability, and full ZF warranty coverage.
Aftermarket steering gears frequently suffer from poor internal machining, resulting in excessive play, steering wander, and premature seal failure. In contrast, the genuine 1316303005 ZF steering gear features precision-ground ball screws and matched ball sets that provide consistent torque feel throughout the entire steering range. Many non-original units also have improperly set torsion bars, causing heavy steering at low speeds or overly light steering on highways. By choosing the original ZF 1316303005 steering gear, you eliminate these risks and preserve the vehicle’s original handling characteristics and safety margins.
Additionally, the genuine part includes a unique serial number traceable to the production batch, ensuring warranty coverage and full compliance with ZF and Sinotruk service bulletins. For any fleet operating SINOTRUK Sitrak trucks, investing in the 1316303005 ZF steering gear is an investment in driver safety, vehicle uptime, and long-term asset value.
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