Overview
The ZF 4108.302.203 PLANETARY GEAR is a critical power-transfer component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part sits within the planetary gearset assembly, where it manages torque distribution and speed reduction between the input shaft and the output housing. The SKU 4108.302.203 ensures precise gear meshing under heavy loads, directly influencing shift quality and drivetrain efficiency. When installed alongside the 4108101061 HOUSING and the 4108201156 HOUSING, this planetary gear forms the core of the transmission’s reduction stage.
Symptoms of Failure
- Whining or grinding noise during acceleration: Worn gear teeth produce a distinct metallic sound, especially in lower gears, indicating the planetary gearset is losing tooth contact integrity.
- Intermittent gear slipping under load: When the 4108.302.203 planetary gear loses its hardened surface, the transmission may momentarily lose torque transfer, causing RPM flare without corresponding vehicle speed increase.
- Metallic debris in transmission fluid: Flakes or particles found during oil changes point directly to planetary gear degradation, often accompanied by a burnt smell from overheated friction surfaces.
- Delayed or harsh engagement: A failing planetary gear can cause hesitation when shifting from neutral to drive or reverse, as the gearset struggles to maintain proper alignment under pressure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4108.302.203 |
| Gear Type | Planetary (sun/planet/carrier assembly) |
| Outer Diameter | ~185 mm (estimated) |
| Inner Diameter (bore) | ~45 mm (estimated) |
| Overall Width | ~55 mm (estimated) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | ~3.2 kg (7.0 lbs) |
| OEM Reference | ZF 4108.302.203 |
| Surface Hardness | 58-62 HRC |
Compatibility
This planetary gear is designed for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with certain variants of the WG180 and WG200 series where the planetary carrier dimensions match. For proper installation, pair this gear with the 4108301304 BEARING COVER to ensure correct axial clearance, and always use a fresh 4108306173 GASKET to prevent fluid leaks at the housing interface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101061 | HOUSING | Encloses the planetary gearset and supports bearing journals |
| 4108201156 | HOUSING | Secondary housing for output shaft and planetary carrier |
| 4108301304 | BEARING COVER | Seals the planetary gear bearing and maintains preload |
| 4108306173 | GASKET | Prevents oil leakage between housing and cover interfaces |
| 0730365280 | TYPE PLATE | Identification plate for transmission model and serial number |
| 0631311009 | GROOVED STUD | Fastens housing sections with precise torque retention |
| 4108301339 | INPUT SHAFT | Transfers engine torque to the planetary gearset |
| 0750116277 | BALL BEARING | Supports input shaft rotation with minimal friction |
| 0630502039 | RETAINING RING | Locks planetary gear components axially in place |
| 0630000041 | SHIM RING | Adjusts gear backlash and bearing preload tolerances |
ZF 4108.302.203 PLANETARY GEAR – Gear RFQ Support
ZF 4108.302.203 PLANETARY GEAR is handled as a gear-train sourcing item for transmission repair teams. PartsZF can review the part number and documentation before quotation.
Part-Number Summary
Use ZF number 4108.302.203 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: INPUT
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4108.302.203 |
|---|---|
| Normalized SKU | 4108302203 |
| Part name | PLANETARY GEAR |
| Product category | gear |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
| Weight | 1.72 |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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- ZF 4143.142.022 GEAR SHIFT SENSOR
