Overview
The ZF 2093.309.048 SUN GEAR SHAFT is a critical power-transfer component located within the planetary gear set of ZF WG-series transmissions. This genuine OEM part directly transmits torque from the input shaft to the planetary gears, enabling smooth gear engagement and load distribution. As a central rotating element, the sun gear shaft works in concert with the 2093109018: DIFFERENTIAL and the 5838300626: DIFFERENTIAL HOUSING to manage high-torque loads in heavy-duty applications. The SKU 2093.309.048 is precision-machined to factory tolerances, ensuring exact fitment and long service life in WG100, WG130, and WG131 gearboxes.
Symptoms of Failure
- Erratic gear engagement or slipping: A worn sun gear shaft causes inconsistent power delivery, especially under load, leading to delayed or rough shifting.
- Metallic grinding or whining noise: Damaged gear teeth or bearing surfaces produce audible high-pitched sounds during operation, indicating advanced wear.
- Transmission fluid contamination: Metal particles from a failing sun gear shaft can contaminate the oil, visible as glitter in the fluid or on the dipstick.
- Reduced torque output or power loss: When the sun gear shaft cannot properly mesh with planetary gears, the transmission fails to transfer full engine torque to the wheels.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 2093.309.048 |
| OEM Reference | ZF 2093.309.048 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | ~185 mm |
| Shaft Diameter | ~38 mm (bearing journal) |
| Tooth Count | 18 teeth (helical cut) |
| Weight | ~1.45 kg |
| Hardness | 58–62 HRC (surface) |
| Compatible Models | WG100, WG130, WG131 |
Compatibility
This genuine ZF sun gear shaft is engineered specifically for the WG100, WG130, and WG131 transmission families. These models are commonly found in municipal trucks, construction loaders, and agricultural tractors. The part is not interchangeable with WG180 or WG200 series units due to differences in shaft diameter and tooth geometry. For optimal performance, always pair this shaft with a new 0750117075: TAPER ROLLER BEARING and inspect the 2093209023: DIFFERENTIAL for matching wear patterns.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109018 | DIFFERENTIAL | Distributes torque between output shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports sun gear shaft radial loads |
| 2093209023 | DIFFERENTIAL | Secondary torque distribution unit |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gear set |
| 0631329088 | SPRING PIN | Secures sun gear shaft alignment |
| 5838300811 | THRUST WASHER | Controls axial play in gear set |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Drives wheel hubs |
| 5838300753 | THRUST WASHER | Reduces friction on planetary carrier |
| 5838300818 | THRUST WASHER | Supports differential side gears |
Frequently Asked Questions
Q: Can the 2093.309.048 sun gear shaft be used in a WG180 transmission?
No. The WG180 uses a larger diameter shaft with a different spline count. Installing this part in a WG180 will cause immediate gear clash and potential housing damage.
Q: How do I confirm the sun gear shaft is the root cause of transmission noise?
Inspect the shaft teeth for pitting or chipping. Also check the mating planetary gears for uneven wear. A failed 0750117075: TAPER ROLLER BEARING often mimics sun gear shaft failure symptoms.
Q: What is the typical service life of this OEM sun gear shaft?
With proper lubrication and load management, the 2093.309.048 typically lasts 8,000–12,000 operating hours. Replace it proactively if you see any tooth surface spalling.
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ZF 2093.309.048 SUN GEAR SHAFT – Shaft RFQ Support
For ZF 2093.309.048 SUN GEAR SHAFT, send the part number, removed-part photos, and application context so PartsZF can prepare a focused sourcing response.
Part-Number Summary
Use ZF number 2093.309.048 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 | 2093.309.048 |
|---|---|
| Normalized SKU | 2093309048 |
| Part name | SUN GEAR SHAFT |
| Product category | shaft |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
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.
Related Parts
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- ZF 2094.110.014 P.T.O. SHAFT
- ZF 4642.303.002 OUTPUT SHAFT
- ZF 2093.110.011 P.T.O. SHAFT
- ZF 5838.300.106 INPUT SHAFT
