Overview
The ZF 2098.309.008 CROWN WHEEL is a critical final-drive component engineered to transfer torque from the differential assembly to the axle shafts in heavy-duty construction machinery transmissions. As an OEM genuine part, this crown wheel (ring gear) meshes precisely with the pinion gear to multiply engine power for demanding earthmoving and material-handling applications. The SKU 2098.309.008 sits within the differential housing, where it converts rotational motion into the mechanical force required to drive wheels or tracks under extreme loads. Its case-hardened metallurgy ensures durability against shock loads and continuous high-torque operation in ZF power-shift transmissions.
Symptoms of Failure
- Whining or howling noise from the differential housing — A worn crown wheel produces a distinct metallic whine that intensifies under acceleration or deceleration, often mistaken for wheel bearing noise.
- Vibration during low-speed turning — As gear teeth wear unevenly, operators may feel a rhythmic shudder through the chassis when maneuvering in tight spaces on job sites.
- Metal debris in transmission fluid — Flakes or glitter in the oil filter or drain plug indicate advanced tooth surface fatigue, requiring immediate inspection of the 2099109038 DIFFERENTIAL and associated components.
- Intermittent drive loss under load — Slippage or clunking during heavy digging or climbing signals that the crown wheel has lost proper backlash with the pinion, risking catastrophic failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2098.309.008 |
| Type | Spiral Bevel Crown Wheel (Ring Gear) |
| Outer Diameter | 280 mm (estimated) |
| Number of Teeth | 41 (estimated) |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 2098.309.008 |
| Mounting Bolt Pattern | 12 x M12 bolts on 200 mm PCD |
Compatibility
This crown wheel is designed for integration with ZF WG180, WG200, and WG210 series power-shift transmissions commonly found in wheel loaders, graders, and telehandlers. It pairs directly with the 2098209016 DIFFERENTIAL carrier assembly and requires proper shimming against the 2095309059 DIFF.HOUSING to maintain correct gear mesh. The 0631329086 SPRING PIN is used to secure the differential pinion shaft during installation. Always verify backlash and tooth contact patterns when replacing this component.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2099109038 | DIFFERENTIAL | Distributes torque to axle shafts |
| 2098209016 | DIFFERENTIAL | Alternative differential carrier assembly |
| 2095309059 | DIFF.HOUSING | Encloses differential gears and crown wheel |
| 0631329086 | SPRING PIN | Locks differential pinion shaft |
| 0730300820 | THRUST WASHER | Reduces axial play in differential |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 2095309081 | DIFFERENTIAL AXLE | Supports side gears and spider gears |
| 5838300811 | THRUST WASHER | Prevents gear-to-housing contact |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Meshes with crown wheel for speed reduction |
| 2095309061 | SLEEVE | Spacer for differential bearing preload |
