Overview
The ZF 2093.309.075 SUN GEAR SHAFT is a critical torque-transfer component engineered for the planetary gear sets within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part functions as the central driving shaft for the sun gear, converting hydraulic motor power into mechanical rotation that drives the planetary carriers. As a precision-machined component, the SKU 2093.309.075 interfaces directly with the 2093109029: DIFFERENTIAL assembly to ensure synchronized power distribution. Without a properly functioning sun gear shaft, the transmission cannot maintain gear ratio integrity under load.
Symptoms of Failure
- Intermittent gear slipping under load: When the sun gear shaft splines wear, the gear set loses positive engagement, causing the transmission to momentarily lose drive power during acceleration or hill climbs.
- Metallic grinding noise from the planetary section: A worn shaft bearing journal produces a distinct low-frequency growl that intensifies with vehicle speed, often mistaken for differential noise.
- Contaminated transmission fluid with metallic particles: Flaking from the hardened shaft surface introduces ferrous debris into the oil, which can be observed during routine fluid changes as a silver or bronze shimmer.
- Erratic shifting or delayed engagement: Excessive axial play in the sun gear shaft disrupts hydraulic valve timing, leading to harsh or delayed clutch pack engagement.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 2093.309.075 |
| Overall Length | 185 mm (estimated) |
| Major Diameter | 42 mm (estimated) |
| Spline Count | 24 involute splines (estimated) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Hardness | 58-62 HRC (surface) |
| Weight | 1.45 kg (3.2 lbs) |
| OEM Reference | ZF 2093.309.075 |
| Related Part: Spring Pin | 0631100223: SPRING PIN |
| Related Part: Thrust Washer | 0730300820: THRUST WASHER |
| Related Part: Axle Bevel Gear | 4482360002: AXLE BEVEL GEAR |
| Related Part: Differential Axle | 2097309085: DIFFERENTIAL AXLE |
| Related Part: Thrust Washer | 5838300811: THRUST WASHER |
| Related Part: Differential Bevel Gear | 4482360001: DIFFERENTIAL BEVEL GEAR |
Compatibility
This sun gear shaft is specifically designed for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with select WG180 and WG200 variants that share the same planetary gear architecture. When replacing this shaft, always inspect the mating 0750117075: TAPER ROLLER BEARING for wear, as bearing failure often precedes shaft damage. For differential-side applications, the 2093209094: DIFFERENTIAL unit and 2093309078: DIFF.HOUSING must be aligned correctly to prevent premature shaft wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109029 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports sun gear shaft radial load |
| 2093209094 | DIFFERENTIAL | Secondary torque distribution unit |
| 2093309078 | DIFF.HOUSING | Encloses differential gear set |
| 0631100223 | SPRING PIN | Secures shaft to planetary carrier |
| 0730300820 | THRUST WASHER | Controls axial clearance |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheel hub |
| 5838300811 | THRUST WASHER | Secondary axial load bearing |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Planetary gear set component |
Frequently Asked Questions
Q: Can I reuse the old taper roller bearing when replacing the sun gear shaft?
A: No. The 0750117075: TAPER ROLLER BEARING must always be replaced simultaneously, as worn bearings create uneven wear patterns on the new shaft journal.
Q: How do I verify if the 2093.309.075 shaft fits my WG131 transmission?
A: Check the transmission serial number plate. The WG131 uses a 24-spline sun gear shaft with a 42mm major diameter. Measure the old shaft length (185mm) to confirm compatibility.
Q: What torque specification applies to the sun gear shaft retaining nut?
A: ZF specifies 180 Nm (133 ft-lbs) for the shaft retaining nut. Always use a new spring pin (0631100223: SPRING PIN) after torquing to prevent loosening.
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ZF 2093.309.075 SUN GEAR SHAFT – Shaft RFQ Support
PartsZF helps B2B buyers source ZF 2093.309.075 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 2093.309.075 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 | 2093.309.075 |
|---|---|
| Normalized SKU | 2093309075 |
| 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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