Overview
The ZF 2093.309.066 SUN GEAR SHAFT is a critical internal component engineered for the WG100, WG130, and WG131 transmission series. This genuine OEM part serves as the central torque-transfer interface between the planetary gear set and the differential assembly. Machined from high-tensile alloy steel, the sun gear shaft ensures precise meshing with planetary pinions, directly influencing gear ratio stability and load distribution. The SKU 2093.309.066 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification. It sits within the transmission’s final drive housing, where it works in concert with the 2093109003: DIFFERENTIAL to convert rotational speed into usable torque for heavy-duty applications.
Symptoms of Failure
- Intermittent gear slipping under load: Worn splines on the sun gear shaft cause the planetary gears to lose engagement, resulting in sudden power loss during acceleration or climbing.
- Metallic grinding noise from the transmission housing: Pitting or spalling on the gear teeth produces a distinct high-pitched whine or grinding sound, especially noticeable in lower gears.
- Contaminated transmission fluid with metal debris: As the shaft surface degrades, microscopic steel particles enter the oil, visible as glitter-like specks during fluid changes.
- Erratic shifting or delayed engagement: Excessive axial play in the sun gear shaft disrupts hydraulic pressure modulation, causing harsh or delayed gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2093.309.066 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 185 mm (estimated) |
| Spline Diameter | 32 mm (estimated) |
| Gear Module | 3.5 (estimated) |
| Weight | 1.8 kg (estimated) |
| OEM Reference | ZF 2093.309.066 |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
Compatibility
This genuine sun gear shaft is specifically designed for ZF’s WG-series powershift transmissions. Confirmed compatible models include WG100, WG130, and WG131. It may also be suitable for select WG180 and WG200 variants with identical planetary gear sets, though verification of spline count and shaft length is recommended. The part integrates directly with the 2093209096: DIFFERENTIAL and the 2093309073: DIFF.HOUSING to form the complete final drive assembly. For proper installation, the 0750117075: TAPER ROLLER BEARING must be replaced simultaneously to maintain correct shaft preload.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109003 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports sun gear shaft radial load |
| 2093209096 | DIFFERENTIAL | Secondary differential unit for WG130 |
| 2093309073 | DIFF.HOUSING | Encloses differential and shaft assembly |
| 0631100223 | SPRING PIN | Secures shaft to planetary carrier |
| 0730300820 | THRUST WASHER | Controls axial clearance of shaft |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 2097309085 | DIFFERENTIAL AXLE | Driveshaft connecting differential to wheels |
| 5838300811 | THRUST WASHER | Secondary axial spacer for gear stack |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Meshes with axle bevel gear for final drive |
Frequently Asked Questions
Q: Can the 2093.309.066 sun gear shaft be used in a ZF WG180 transmission?
A: While the WG180 shares similar planetary architecture, we recommend verifying the spline count and overall length against your original shaft. The WG180 may require a different part number if the shaft is longer than 185 mm.
Q: What is the typical lifespan of this sun gear shaft under normal operating conditions?
A: With proper lubrication and regular fluid changes (every 500 hours), the case-hardened steel shaft typically lasts 8,000–12,000 hours. Premature failure often indicates contamination or a failing taper roller bearing.
Q: Do I need to replace the thrust washer and spring pin at the same time?
A: Yes. The 0730300820: THRUST WASHER and 0631100223: SPRING PIN are single-use components that must be renewed to prevent axial play and ensure the shaft remains locked to the planetary carrier.
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Phone: +86 158 2286 3467 |
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ZF 2093.309.066 SUN GEAR SHAFT – Shaft RFQ Support
PartsZF helps B2B buyers source ZF 2093.309.066 SUN GEAR SHAFT with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This shaft page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 2093.309.066 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: DIFFERENTIAL
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 | 2093.309.066 |
|---|---|
| Normalized SKU | 2093309066 |
| Part name | SUN GEAR SHAFT |
| Product category | shaft |
| Cross-reference support | Available for RFQ review |
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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