Sinotruk Axle And Steering Parts

Sinotruk HOWO Truck Pinion and Crown Wheel Gear Set – Model 99012320177 (OEM 199012320177) – Heavy-Duty Rear Axle Differential Gears for HOWO Trucks

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Product description: OEM-quality Sinotruk HOWO pinion and crown wheel gear set (99012320177). Durable, precision-matched for smooth differential performance. Fast shipping worldwide.
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Technical Specifications – Pinion & Crown Wheel Gear Set (99012320177)

OEM Part Numbers:
99012320177
199012320177
HC16-4107010 (Crown Wheel)
HC16-4107020 (Pinion Gear)
Application:
Rear axle differential for Sinotruk HOWO A7, HOWO ST, HOHMAN, HOWO T7H, and other models equipped with HC16 or HC19 single/double reduction axles

Gear Ratio5.73:1
Number of Teeth – Crown Wheel (Ring Gear) 41 teeth
Number of Teeth – Pinion Gear 7 teeth
Module (Normal Module) 8 mm
Pressure Angle 20°
Spiral Angle (Pinion) 22° 30' (Right-hand spiral)
Offset (Hypoid Offset) 38 mm (typical for HC16 axle)
Pitch Diameter – Crown Wheel ~328 mm
Face Width – Crown Wheel 54 mm
Material 20CrMnTiH (Alloy carburizing steel)
Heat Treatment Carburized & hardened (Case depth: 1.2–1.8 mm)
Surface Hardness HRC 58–62 (pinion), HRC 56–60 (crown wheel)
Core Hardness HRC 30–40
Tooth Finish Ground after heat treatment for noise reduction
Backlash Setting Range0.25 – 0.40 mm (recommended)