Overview
The ZF 2099.309.024 Crown Wheel is a critical ring gear component engineered for heavy-duty construction machinery transmissions. This OEM genuine part transfers torque from the differential pinion to the axle shafts, enabling smooth power delivery in demanding off-road environments. As a precision-machined gear, the 2099.309.024 sits within the final drive assembly, meshing directly with the pinion gear to multiply engine torque. The SKU 2099.309.024 is manufactured to ZF’s exacting tolerances, ensuring optimal tooth contact patterns and minimal backlash. When paired with a 2099109030: DIFFERENTIAL, this crown wheel forms the heart of the drivetrain’s torque distribution system.
Symptoms of Failure
When the ZF 2099.309.024 crown wheel wears out, operators will notice distinct performance degradation. Whining or howling noise during acceleration is the most common early indicator, often mistaken for wheel bearing issues. Vibration in the driveline under load occurs as tooth profiles become uneven, transmitting harmonics through the axle housing. Metal particles in the transmission oil signal advanced wear, typically found during routine fluid changes. Intermittent gear slipping or clunking when transitioning from forward to reverse indicates severe tooth damage or chipping. These symptoms often coincide with failure of the 0750117075: TAPER ROLLER BEARING, which supports the crown wheel’s axial loads.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 2099.309.024 |
| Outer Diameter | 310 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Tooth Count | 41 teeth (estimated) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 8.2 kg (18.1 lbs) |
| OEM Reference | ZF 2099.309.024 |
| Hardness | 58-62 HRC |
Compatibility
This crown wheel is designed for ZF’s WG series powershift transmissions commonly found in construction machinery. Primary compatible models include the ZF WG180, ZF WG200, and ZF WG211 series. It also fits select ZF Ergopower and ZF Ecomix drivelines used in wheel loaders and telehandlers. The 2099.309.024 interfaces directly with the 2093209094: DIFFERENTIAL assembly and requires proper shimming when installed into the 2093309078: DIFF.HOUSING. Always verify tooth pattern contact after installation to ensure long service life.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2099109030 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports crown wheel axial loads |
| 2093209094 | DIFFERENTIAL | Houses spider gears and side gears |
| 2093309078 | DIFF.HOUSING | Encloses differential assembly |
| 0631100223 | SPRING PIN | Secures differential components |
| 0730300820 | THRUST WASHER | Reduces axial friction |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheel ends |
| 5838300811 | THRUST WASHER | Controls side gear endplay |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Meshes with crown wheel teeth |
