Overview
The ZF 4108.302.261 PLANETARY GEAR is a critical OEM genuine component engineered for the WG100, WG130, and WG131 transmission series. This precision-machined gear sits within the planetary gearset assembly, where it transfers torque between the sun gear and ring gear to enable smooth ratio changes under heavy loads. As a core element of the power flow path, the SKU 4108.302.261 ensures reliable operation in demanding industrial applications. When paired with a properly sealed 4108101108 HOUSING and a fresh 4108306172 GASKET, this planetary gear maintains optimal alignment and lubrication integrity.
Symptoms of Failure
- Gear slipping under load: A worn planetary gear loses tooth engagement, causing intermittent power loss or hesitation during acceleration, especially in WG130 models.
- Metallic grinding noises: Pitting or spalling on the gear teeth produces a distinct grinding or whining sound that intensifies with speed, often accompanied by vibration.
- Oil contamination with metal debris: As the gear degrades, fine metallic particles enter the transmission fluid, visible during oil changes as a silver or bronze sheen.
- Erratic shifting behavior: Damaged planetary gears can cause delayed or harsh shifts, as the transmission struggles to maintain proper gear ratios.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4108.302.261 |
| OEM Reference | ZF 4108.302.261 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 118 mm |
| Tooth Count | 42 teeth (helical) |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
| Compatible Input Shaft | 4108301436 INPUT SHAFT |
| Identification | Use 0730365280 TYPE PLATE for verification |
Compatibility
This genuine ZF planetary gear is specifically designed for the following transmission models: WG100, WG130, and WG131. It is also compatible with select WG180 and WG200 variants that share the same planetary carrier architecture. Always cross-reference your transmission serial number with the 0730365280 TYPE PLATE to confirm fitment. For proper installation, ensure the 4108101108 HOUSING is free of cracks and the 4108306172 GASKET is replaced simultaneously to prevent leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101108 | HOUSING | Encloses and supports the planetary gearset |
| 4108306172 | GASKET | Seals the housing-to-transmission interface |
| 0730365280 | TYPE PLATE | Provides model identification and specs |
| 4108301436 | INPUT SHAFT | Transfers engine torque to the planetary gear |
| 0735330931 | BALL BEARING | Supports rotating shaft within the gearset |
| 0630532160 | RETAINING RING | Secures gear axial position |
| 0630531130 | RETAINING RING | Secondary axial retention for planetary carrier |
| 0636302014 | SCREW PLUG | Seals oil passages in the housing |
| 0634801057 | SEALING RING | Prevents fluid leaks at shaft interfaces |
| 4475280018 | SCREW PLUG | Closes pressure test ports |
ZF 4108.302.261 PLANETARY GEAR – Gear RFQ Support
Use ZF 4108.302.261 PLANETARY GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4108.302.261 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 | 4108.302.261 |
|---|---|
| Normalized SKU | 4108302261 |
| 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 | 2.36 |
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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