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The Sinotruk HOWO Rear Axle Spiral Bevel Gear Set (Part No. AZ9970320263) is a high-performance differential component. With a precision-engineered 35:16 tooth ratio, it is specifically designed for the MCY13/MCY16 series single reduction axles used in HOWO T7H, Sitrak C7H, and Hohan heavy-duty trucks. This assembly ensures optimal power distribution and high load-bearing capacity for long-haul transportation.
Technical Specifications:
Part Name: Rear Axle Bevel Gear Set / Crown Wheel and Pinion
Part Number: AZ9970320263
Teeth Ratio: 35:16 (Speed Ratio: 2.1875)
Material: Premium 20CrMnTi Alloy Steel
Processing: Forged, CNC Gear Ground, and Carburized Heat Treatment
Hardness: Surface HRC 58-62; Core HRC 33-48
Applicable Axle: Sinotruk MCY13 / MCY16 Single Reduction Axles
A：The tooth ratio is 35:16, providing a high-torque output for Sinotruk heavy trucks.
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To guarantee the longevity of your Sinotruk howo parts and avoid premature gear failure, follow these professional guidelines:
Matched Set Replacement: Always replace the crown wheel and the pinion together as a matched pair (AZ9970320263). Never mix a new gear with a used one.
Backlash Adjustment: Use a dial indicator to set the gear backlash precisely between 0.20mm and 0.35mm (refer to the Sinotruk axle service manual).
Contact Pattern Test: Apply gear marking compound to check the tooth contact pattern. The contact area must be centered on the tooth flank to ensure quiet operation and even load distribution.
Bearing Check: Inspect and preferably replace the pinion bearings and differential bearings during the gear set installation.
Oil Grade: Refill the axle housing with genuine API GL-5 85W-90 heavy-duty gear oil. Ensure the housing is free of metal debris before assembly.
