A tractor crown wheel and pinion set is a bevel gear pair used to transfer power while changing the direction of rotation, typically in the differential or axle drive. The smaller pinion drives the larger crown wheel, creating a defined reduction ratio before torque reaches the axle system.
Why the two gears are treated as a set
The crown wheel and pinion mesh continuously under load. Their tooth geometry, contact pattern and ratio are designed to work together. When a catalog identifies the component as a bevel gear set, buyers should verify the complete pair rather than choosing one gear only by diameter or appearance.
Understanding tooth ratio
A notation such as Z=10/34 indicates the tooth counts of the mating gears. Dividing the larger count by the smaller count gives the basic gear ratio. Even when two sets look similar, a different tooth combination changes the ratio and makes the set unsuitable for the intended application.
Common information used for identification
- OEM or reference number
- Gearbanks product code
- Tractor brand and model
- Pinion tooth count
- Crown wheel tooth count
- Mounting hole pattern and flange details
- Pinion shaft spline and bearing surfaces
- Axle or differential application
What wear can tell you
Abnormal tooth contact, pitting, scoring, chipped teeth or excessive backlash can indicate wear in the gear set or supporting bearings. Before replacing only the visible damaged component, the surrounding bearings, preload, lubrication and mating gear condition should be checked by a qualified technician.
B2B ordering workflow
For the fastest catalog match, search the OEM number first. Then compare the tooth pair and machine application shown in the product record. When submitting a quotation request, include the quantity and all known machine information. For a new or special application, a drawing or sample can help the engineering review.