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The genuine ZF synchronizer ring with OEM number 1297304507 is a precision‑engineered component designed to ensure smooth, noiseless gear changes in SINOTRUK Sitrak heavy‑duty transmissions. This critical synchronizer ring matches shaft speed to gear speed, eliminating gear clash and reducing shift effort. As an essential element within the Sinotruk sitrak parts portfolio, the 1297304507 ZF synchronizer ring delivers factory‑grade friction characteristics, exceptional durability, and the reliability required for millions of shift cycles.
The 1297304507 ZF synchronizer ring is a fundamental component within the ZF‑SINOTRUK transmission family, responsible for equalizing rotational speeds between gears and the main shaft before engagement. Manufactured from high‑performance friction material bonded to a precision‑machined steel cone, this ring provides the precise friction coefficient required for smooth, rapid synchronization. In Sitrak C7H, C9H, and TX series trucks, the synchronizer ring endures high thermal loads and repeated engagement cycles, making its material composition and manufacturing precision paramount.
Fleet data from long‑haul and vocational operations confirms that using the genuine 1297304507 synchronizer ring reduces shift complaints by over 60% and extends transmission overhaul intervals by up to 35% compared to aftermarket alternatives. Its optimized friction material provides consistent coefficient of friction across a wide temperature range, ensuring reliable synchronization in both cold starts and sustained high‑speed operation. For fleet managers, this translates into improved driver satisfaction, reduced maintenance costs, and maximized vehicle uptime.
High‑grade friction material with optimized surface texture ensures consistent engagement force, eliminating gear clash and grinding.
Advanced friction material maintains stable coefficient of friction up to 350°C, preventing fade during repeated shifts.
Wear‑resistant friction lining bonded with high‑strength adhesive, tested to withstand over 1 million shift cycles.
| Parameter | Specification |
|---|---|
| OEM Number | 1297304507 |
| Product Type | ZF Synchronizer Ring (Transmission Synchronizer) |
| Brand | ZF / SINOTRUK Sitrak Original Equipment |
| Application | Sitrak C7H, C9H, A7, TX series – ZF 16‑speed / 12‑speed transmissions |
| Friction Material | High‑performance sintered bronze / carbon composite (ZF proprietary) |
| Cone Angle | 7.5° ±0.2° |
| Outer Diameter | 98.5 mm ±0.1 mm |
| Width | 18.0 mm ±0.1 mm |
| Friction Coefficient (μ) | 0.08 – 0.12 (wet, dynamic) |
| Max. Operating Temp. | 350°C (peak) |
| Weight | 0.28 kg (approx.) |
When replacing the synchronizer ring with the genuine 1297304507 ZF unit, always inspect the mating gear cone, hub, and slider for wear or damage. Thoroughly clean all components and lubricate with ZF‑approved transmission fluid during assembly. Install the synchronizer ring ensuring correct orientation (identifying marks facing the gear). Verify that the ring rotates freely on the cone before installing the slider. Always replace synchronizer rings in sets for the respective gear pair to maintain consistent shift feel.
During transmission overhauls, inspect the synchronizer rings for signs of glazing, cracking, or wear beyond the service limit (typically 0.3 mm reduction in friction material thickness). Using the genuine 1297304507 synchronizer ring ensures that the friction characteristics match ZF’s original design, preventing premature failure of mating components. For vehicles operating in severe conditions, consider inspecting synchronizer rings every 400,000 km to maintain optimal shift performance.
Every 1297304507 ZF synchronizer ring is manufactured in IATF 16949 certified facilities, with 100% dimensional inspection and 100% friction performance testing on ZF’s proprietary test rigs. Each ring undergoes thermal cycling tests and friction coefficient validation to ensure consistent performance across its service life. The friction material is bonded using aerospace‑grade adhesives, tested for shear strength and thermal resistance. Counterfeit rings often use inferior friction materials that degrade rapidly, causing gear clash and premature transmission failure. The genuine 1297304507 guarantees safety, reliability, and full ZF warranty coverage.
Aftermarket synchronizer rings frequently use generic friction materials with inconsistent friction coefficients, leading to poor shift feel, gear clash, and premature wear. In contrast, the genuine 1297304507 features ZF‑developed friction material precisely matched to the transmission’s design parameters. Many non‑original rings also have inaccurate cone angles, resulting in incomplete synchronization and increased shift effort. By choosing the original ZF 1297304507 synchronizer ring, you eliminate these risks and preserve the vehicle’s original shift quality and transmission reliability.
Additionally, the genuine part carries 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 1297304507 ZF synchronizer ring is an investment in shift quality, transmission longevity, and overall driver satisfaction.
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