Overview
The ZF 2098.304.113 BEVEL PINION is a critical gear component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part transfers rotational force from the driveshaft to the ring gear, enabling torque direction change within the differential assembly. Positioned at the input of the final drive, the bevel pinion meshes directly with the CROWN WHEEL to deliver smooth power distribution. The SKU 2098.304.113 is precision-machined to factory tolerances, ensuring minimal backlash and optimal gear contact patterns. Without this pinion, the transmission cannot convert engine power into axle rotation, making it indispensable for drivetrain integrity.
Symptoms of Failure
- Whining or howling noise during acceleration: Worn gear teeth on the bevel pinion create irregular contact patterns, producing a high-pitched sound that intensifies under load. This often signals the need for immediate replacement.
- Vibration in the driveline at highway speeds: As the pinion bearing surface degrades, rotational imbalance transfers through the transmission, causing noticeable shuddering in the chassis.
- Oil leaks near the pinion seal area: Excessive wear on the pinion shaft or seal surface allows transmission fluid to escape, leading to low lubricant levels and potential gear damage.
- Intermittent gear slipping or clunking: Advanced wear on the pinion teeth can cause momentary loss of engagement with the crown wheel, resulting in abrupt torque interruptions.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 2098.304.113 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Tooth Count | 13 (estimated) |
| Pitch Diameter | 65 mm |
| Shaft Diameter | 35 mm |
| Overall Length | 145 mm |
| Weight | 1.8 kg |
| OEM Reference | ZF 2098.304.113 |
| Hardness | 58-62 HRC |
Compatibility
This bevel pinion is specifically designed for ZF WG100, WG130, and WG131 transmissions. It is also compatible with select variants of the WG180 and WG200 series when used in conjunction with the DIFFERENTIAL assembly. The part integrates directly with the DIFFERENTIAL HOUSING and the DIFFERENTIAL unit. For optimal performance, always verify your transmission model code before installation. The pinion is not backward-compatible with older WG series without corresponding crown wheel replacement.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2098109042 | DIFFERENTIAL | Distributes torque to axle shafts |
| 2098309011 | CROWN WHEEL | Meshes with bevel pinion for final drive |
| 2099209001 | DIFFERENTIAL | Alternate differential assembly variant |
| 2098309010 | DIFFERENTIAL HOUSING | Encloses differential gears |
| 2098309009 | DIFFERENTIAL HOUSING | Alternate housing for WG series |
| 2098309031 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2098309030 | AXLE BEVEL GEAR | Matching bevel gear for differential |
| 2098309032 | DIFFERENTIAL BEVEL GEAR | Internal differential gear set |
| 12883200682 | THRUST WASHER | Reduces axial friction in assembly |
| 0635332059 | BALL BEARING | Supports pinion shaft rotation |
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