Crown wheel and drive pinion

Spare parts for the differential assembly: Crown wheel and drive pinion

In this category of our online catalogue, we offer crown wheel and drive pinion sets designed specifically for heavy-duty and industrial vehicles. These components are critical parts within the transmission system, responsible for transferring engine power to the wheels and providing the speed reduction required for efficient truck or bus operation.

This selection of spare parts is aimed at professional mechanics and fleet managers looking for replacement components for differential assembly repairs. Finding the exact reference is vital to ensure proper mechanical fitment, avoid transmission noise and extend the service life of the drive axle after workshop intervention.

Key aspects for choosing the bevel gear set

• Gear ratio (Ratio): It is essential to verify the exact reduction ratio to maintain the vehicle’s original performance.
• Tooth count: Check the number of teeth on both the crown wheel and the pinion, as they must mathematically match the axle configuration.
• Vehicle and axle model: Make sure the spare part is compatible with the truck brand and, more importantly, with the specific model of the installed axle or final drive.
• OEM reference: Use the manufacturer’s original reference number to identify the equivalent part in our catalogue with no margin for error.
• Direction of rotation: Check whether the gearing requires a specific direction of rotation to avoid differential installation issues.

Frequently asked questions

What is the function of the crown wheel and drive pinion?

They form the main bevel gear pair of the differential. Their function is to receive movement from the driveshaft (through the pinion) and transmit it to the axle shafts (through the crown wheel) at a 90-degree angle, while simultaneously reducing rotational speed to increase torque at the wheels.

Should the crown wheel and pinion be replaced at the same time?

Yes, it is imperative to replace both components as a matched set. During manufacturing, the crown wheel and pinion undergo a joint lapping process to ensure perfect contact. Mixing used parts or parts from different sets will cause noise, premature wear and differential failure.

What are the symptoms of a worn crown wheel or pinion?

The most common symptom is a humming or whining noise coming from the differential that varies with acceleration or deceleration. Excessive vibrations, play when setting off, or metallic noises (“clonk”) may also occur if there are damaged or broken teeth inside the assembly.

How do I identify the correct final drive ratio?

The final drive ratio is obtained by dividing the number of teeth on the crown wheel by the number of teeth on the pinion. This information is usually stamped on the edge of the crown wheel or on the axle identification plate. It is essential to respect this value so as not to alter the vehicle’s speed and pulling force.