Overview
The ZF 4108.303.272 PLANETARY GEAR is a critical power-transmission component engineered specifically for the WG100, WG130, and WG131 series transmissions. This OEM genuine part sits within the planetary gear set assembly, where it manages torque distribution and speed reduction between the input shaft and the output carrier. The SKU 4108.303.272 is precision-machined to interface seamlessly with the 4108101112: HOUSING and the 4108201177: HOUSING, ensuring concentric alignment under heavy loads. When paired with the 0636302056: SCREW PLUG and the 4108301304: BEARING COVER, this gear maintains stable meshing within the planetary carrier, directly influencing shift quality and overall transmission longevity.
Symptoms of Failure
- Whining or grinding noise during acceleration: Worn gear teeth on the 4108.303.272 produce a high-pitched whine that intensifies under load, often misdiagnosed as bearing failure.
- Intermittent gear slipping in forward ranges: As the planetary gear loses tooth profile integrity, the WG100/WG130 transmission may momentarily lose torque transfer, causing erratic RPM surges.
- Metallic debris in transmission fluid: Flaking or pitting on the gear surface sheds fine metal particles that contaminate the oil, accelerating wear on the 4108302099: PLANET CARRIER and 0635332196: BALL BEARING.
- Delayed engagement from Neutral to Drive: Excessive backlash from a degraded planetary gear forces the transmission to hunt for proper engagement, a symptom often linked to a failing 4108302007: BEARINGSHEET.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4108.303.272 |
| Gear Type | Planetary (Sun/Planet) |
| Material | Case-hardened alloy steel (20MnCr5) |
| Outside Diameter | 118.5 mm |
| Tooth Count | 28 teeth (helical) |
| Weight | 1.42 kg |
| OEM Reference | ZF 4108.303.272 |
| Hardness | 58-62 HRC |
| Surface Finish | Ground & shot-peened |
Compatibility
This genuine ZF planetary gear is designed for the WG100, WG130, and WG131 transmission families. It is also compatible with the WG180 and WG200 series when used in conjunction with the correct 4108102042: INPUT shaft and 4108306173: GASKET kit. Always verify the gear set ratio against your transmission’s serial plate; the 4108.303.272 replaces earlier revisions with an improved tooth profile for reduced noise. For complete sealing, pair with a new 0750110040: SHAFT SEAL during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Encloses planetary gear set |
| 4108201177 | HOUSING | Rear housing support |
| 0636302056 | SCREW PLUG | Seals oil passage |
| 4108301304 | BEARING COVER | Retains planetary bearings |
| 4108306173 | GASKET | Prevents fluid leaks |
| 0750110040 | SHAFT SEAL | Input shaft oil seal |
| 4108102042 | INPUT | Input shaft assembly |
| 4108302099 | PLANET CARRIER | Holds planet gears |
| 4108302007 | BEARINGSHEET | Thrust bearing shim |
| 0635332196 | BALL BEARING | Radial support for gear |
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