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SHACMAN F2000/F3000/X3000 Auxiliary Box Main Shaft Reduction Gear JS180-1707106
FUNCTION
1. Achieving Low-Range Speed Reduction and Torque Amplification: Under low-range operating conditions within the auxiliary transmission, this gear engages with the drive gear on the auxiliary countershaft. This creates a substantial reduction ratio, significantly amplifying the torque output from the main transmission to provide the high torque required by heavy-duty trucks for starting, hill climbing, and low-speed heavy-load operations.
2. Power Transmission and Torque Distribution: As a fixed gear mounted on the auxiliary main shaft, it efficiently transmits power received from the auxiliary countershaft to the main shaft (output shaft), thereby ensuring the continuity and reliability of the entire powertrain chain.
3. Facilitating High/Low Range Shifting: It works in conjunction with the auxiliary high-range gear and the synchronizer assembly to enable seamless shifting between the high and low ranges.
4. Withstanding Heavy-Load Impact: The gear is engineered using high-strength alloy steel, forged and subsequently subjected to carburizing and quenching treatments. Its gear teeth feature high surface hardness, exceptional fatigue resistance, and superior impact strength, enabling them to withstand the high-torque loads and frequent shifting shocks inherent in heavy-duty commercial vehicles while maintaining long-term engagement precision.
Advantages
| No. | Advantage Category | Key Advantages |
|---|---|---|
| 1 | Powerful Reduction & Torque Multiplication | 42-tooth large reduction design (optimized ratio), significantly amplifies torque in low range (high multiplication factor), provides exceptional low-speed pulling power for heavy trucks, prevents weak starts or stalling under heavy load (supports engines with 1800 Nm+ input torque). |
| 2 | High Strength & Impact Resistance | Forged high-strength alloy steel + carburized and quenched treatment; high surface hardness, fatigue-resistant, and impact-resistant; withstands frequent heavy-load shifting shocks; long service life (matches transmission overhaul interval 300,000–500,000+ km), minimal risk of tooth breakage or wear. |
| 3 | Efficient Transmission & Low Noise | Precision tooth profile machining (optimized involute), smooth meshing, reduces power loss and mechanical noise; synergizes with FAST twin countershaft design to improve overall transmission efficiency and fuel economy. |
| 4 | Excellent Low-Speed Response & Heavy-Load Adaptability | Specifically optimized for heavy-duty conditions; delivers strong low-range torque for full-load hill starts, long climbs, and construction hauling; wide torque band makes driving easier and more powerful in demanding scenarios. |
| 5 | High Compatibility & Cost-Effective Maintenance | OEM-matched to FAST 9/12JS series auxiliary boxes, precise tolerances, reliable installation; abundant aftermarket replacements. User feedback: strong low-range performance, no abnormal noise, smooth shifting, and low repair cost with high value. |
DETAILS
| DESCRIPTION | Auxiliary Box Main Shaft Reduction Gear | PART NUMBER | JS180-1707106 |
| WEIGHT |
3KG |
VOLUME |
Outer diameter 250 mm thickness 60 mm. |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | GEARBOX |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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