Overview
The ZF 2093.309.028 GEAR RING is a critical component engineered for the planetary gear sets within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part functions as the internal ring gear that meshes directly with the planetary pinions, transferring torque from the input shaft to the differential assembly. The SKU 2093.309.028 sits at the heart of the final drive reduction stage, ensuring smooth power delivery under heavy loads. When installed alongside the 2093109001: DIFFERENTIAL, this gear ring maintains precise gear lash and load distribution across the entire axle system.
Symptoms of Failure
- Whining or grinding noise during acceleration — A worn gear ring produces a distinct high-pitched whine that intensifies under load, often mistaken for wheel bearing failure. This indicates pitting or spalling on the internal tooth flanks.
- Intermittent gear slipping under heavy torque — When the ring gear teeth lose their hardened surface, the transmission may momentarily lose drive engagement, particularly during uphill climbs or when towing maximum loads.
- Metallic debris in transmission fluid — Flakes or silver particles found during routine oil changes signal advanced wear of the gear ring, often accompanied by damage to the 0750117075: TAPER ROLLER BEARING that supports the ring gear carrier.
- Vibration through the driveline at highway speeds — Uneven tooth wear creates cyclic vibration patterns that can be felt in the chassis, indicating the gear ring has lost its original concentricity.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 2093.309.028 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outside Diameter | 198.5 mm (estimated) |
| Internal Tooth Count | 72 teeth (estimated) |
| Face Width | 32.0 mm |
| Weight | 2.85 kg (6.28 lbs) |
| OEM Reference | ZF 2093.309.028 |
| Hardness | 58-62 HRC (case depth 0.8-1.2 mm) |
Compatibility
This gear ring is specifically designed for ZF WG100, WG130, and WG131 series transmissions. It is also compatible with certain variants of the WG180 and WG200 models that share the same planetary gear architecture. The part integrates directly with the 2093209095: DIFFERENTIAL and the 2093309071: DIFF.HOUSING to form the complete final drive assembly. Always verify your transmission serial number before ordering, as minor tooth profile variations exist between early and late production units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109001 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports ring gear carrier rotation |
| 2093209095 | DIFFERENTIAL | Secondary differential for multi-axle systems |
| 2093309071 | DIFF.HOUSING | Encloses differential and ring gear assembly |
| 0631100223 | SPRING PIN | Secures gear ring to differential carrier |
| 0730300820 | THRUST WASHER | Controls axial clearance of gear ring |
| 4482360002 | AXLE BEVEL GEAR | Transfers power from ring gear to axle |
| 2097309085 | DIFFERENTIAL AXLE | Output shaft for differential assembly |
| 5838300811 | THRUST WASHER | Secondary axial thrust control |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Primary bevel gear in differential set |
Frequently Asked Questions
Q: Can the ZF 2093.309.028 gear ring be replaced without removing the entire transmission?
A: In most cases, the gear ring can be accessed by removing the differential housing cover and the axle shafts. However, the 2093309071: DIFF.HOUSING must be unbolted, which often requires transmission removal on chassis with limited clearance.
Q: How do I distinguish between a worn gear ring and a failing taper roller bearing?
A: A worn gear ring produces a rhythmic grinding sound that changes with gear selection, while a failing 0750117075: TAPER ROLLER BEARING creates a constant rumble that increases with vehicle speed regardless of gear. Inspect the oil for metallic particles to confirm.
Q: Is the 2093.309.028 gear ring interchangeable with the 2093.309.027 version?
A: No. The 2093.309.028 has a different internal tooth profile and hardened depth compared to the 2093.309.027. Using the incorrect part will cause premature failure of the 2093109001: DIFFERENTIAL due to mismatched gear lash.
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ZF 2093.309.028 GEAR RING – Gear RFQ Support
Use ZF 2093.309.028 GEAR RING as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 2093.309.028 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: REAR AXLE HOUS.
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 | 2093.309.028 |
|---|---|
| Normalized SKU | 2093309028 |
| Part name | GEAR RING |
| Product category | gear |
| 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.
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- ZF 4143.142.022 GEAR SHIFT SENSOR
