AZ9231320271 Differential Assembly — Sinotruk HOWO HC16/ST16 Axle Chassis Spare Parts

Core Function

The primary function is to distribute engine torque between the left and right drive wheels while permitting them to rotate at different speeds during cornering. This reduces tire scrub and friction between the tires and the road surface, enabling smooth vehicle turning .

Key Performance Features

Torque Distribution and Traction

• Described as a conical planetary gear differential with 4 pinion gears .

• Some listings indicate a 25% locking torque (limited-slip function), which can improve traction on slippery or uneven terrain .

• The 46-tooth gear configuration is commonly used on HC16 and AC16 axle platforms .

Material and Durability

• Pinion gears are reportedly made of 20CrMnTi alloy steel, case-hardened and quenched to HRC 58–62 for wear resistance .

• The carrier/housing is described as cast iron (GS600 grade in one listing) or high-strength alloy steel, depending on the supplier .

• One supplier claims testing over 2,000,000 cycles and conformity to ISO 6336 standards .

Bearing and Lubrication

• Pre-mounted tapered roller bearings (P6 class, NSK/SKF per one source) with calibrated preload for quiet operation .

• Housing features baffles to optimize lubrication flow and protect internal components from excessive heat .

Operating Specifications (Supplier-Reported)

• Weight: commonly listed as 23 kg or 32 kg, depending on the listing (likely reflecting different kit contents or packaging) .

• Oil: 80W-90 EP, approximately 2.5 L internal capacity .

• Operating temperature range: −30°C to +120°C .