Overview
The ZF 2093.368.121 INPUT GEAR is a precision-machined component designed for the input shaft assembly of ZF WG100, WG130, and WG131 transmissions. This OEM genuine part serves as the primary power transfer interface, receiving torque directly from the engine clutch or torque converter and distributing it through the transmission’s planetary gear sets. The SKU 2093.368.121 sits at the front of the gear train, meshing with the countershaft and differential assembly to initiate gear reduction. Its hardened steel construction ensures durability under high cyclic loads, making it critical for maintaining driveline efficiency in medium-duty commercial vehicles and industrial equipment.
Symptoms of Failure
- Whining or grinding noise during acceleration: When the input gear teeth wear unevenly, you will hear a distinct metallic whine that intensifies under load, often mistaken for differential noise.
- Hard shifting or gear clash: A worn 2093.368.121 gear can cause misalignment in the input shaft, leading to delayed engagement or grinding when shifting between forward and reverse.
- Metal particles in transmission fluid: Flaking or pitting on the gear face sheds ferrous debris into the oil, visible during drain intervals as glitter or sludge.
- Vibration at specific RPM ranges: As the input gear loses its tooth profile symmetry, harmonic vibrations will transmit through the driveline, particularly between 1,500–2,200 RPM.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2093.368.121 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Number of Teeth | 23 (helical) |
| Outside Diameter | 112.5 mm |
| Bore Diameter | 35.0 mm |
| Face Width | 42.0 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF 2093.368.121 |
| Heat Treatment | Carburized & tempered (58–62 HRC) |
Compatibility
This input gear is engineered specifically for the ZF WG100, WG130, and WG131 series transmissions, commonly found in municipal trucks, fire apparatus, and off-highway loaders. It is not interchangeable with the WG180 or WG200 series due to differences in shaft spline count and helix angle. When replacing the 2093.368.121, always inspect the mating 2093109008: DIFFERENTIAL for wear patterns, as a failing input gear often damages the differential pinion. Additionally, verify the condition of the 0750117075: TAPER ROLLER BEARING that supports the input shaft, and check the 2093209096: DIFFERENTIAL for backlash tolerance. The 2093309073: DIFF.HOUSING must also be free of cracks to ensure proper gear alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109008 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports input shaft radial loads |
| 2093209096 | DIFFERENTIAL | Secondary torque split assembly |
| 2093309073 | DIFF.HOUSING | Encloses differential gears |
| 0631100223 | SPRING PIN | Retains gear on shaft |
| 0730300820 | THRUST WASHER | Controls axial clearance |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel ends |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to hubs |
| 5838300811 | THRUST WASHER | Reduces friction in gear stack |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Meshes with axle bevel gear |
Frequently Asked Questions
Q: Can the 2093.368.121 input gear be used in a ZF WG180 transmission?
A: No. The WG180 uses a larger 28-tooth input gear with a different spline pitch. Installing this part in a WG180 will cause immediate gear clash and potential housing damage.
Q: How do I confirm the input gear is the root cause of vibration?
A: Perform a visual inspection through the fill plug; look for chipped teeth or a polished wear pattern on the drive side. Compare backlash to the service manual specification of 0.10–0.25 mm.
Q: Should I replace the taper roller bearing at the same time?
A: Yes. The 0750117075: TAPER ROLLER BEARING often suffers brinelling from gear vibration. Replacing both ensures proper preload and extends service life.
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ZF 2093.368.121 INPUT GEAR – Gear RFQ Support
PartsZF helps B2B buyers source ZF 2093.368.121 INPUT GEAR with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This gear 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 2093.368.121 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: SPLITTER BOX
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 | 2093.368.121 |
|---|---|
| Normalized SKU | 2093368121 |
| Part name | INPUT GEAR |
| Product category | gear |
| 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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