Overview
The ZF 2094.303.055 COUNTERSHAFT is a critical internal component engineered for the robust WG100, WG130, and WG131 transmission series. This OEM genuine part serves as the primary torque-transfer interface, meshing directly with multiple gear sets to facilitate smooth ratio changes under heavy load. As a central rotating shaft, it supports and aligns the gear clusters within the main transmission housing. The SKU 2094.303.055 is precision-machined to ZF’s exacting tolerances, ensuring minimal backlash and extended service life in demanding industrial applications. This countershaft works in concert with the 2094101012: TRANSMISSION HOUSING to maintain correct gear spacing and load distribution.
Symptoms of Failure
When the ZF 2094.303.055 countershaft begins to degrade, operators will notice distinct performance issues. Look for these specific failure symptoms to diagnose the problem early:
- Persistent gear whine or grinding noise during acceleration or deceleration, indicating worn splines or bearing surfaces on the countershaft.
- Intermittent gear slipping under load, often accompanied by a sudden loss of power transfer, which points to fatigue cracks or surface pitting on the shaft.
- Metal debris in transmission fluid during routine oil changes, a clear sign of countershaft material wear contaminating the lubricant.
- Vibration through the driveline at specific RPM ranges, suggesting the countershaft has developed runout or imbalance due to wear.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 2094.303.055 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | Approx. 420 mm |
| Bearing Journal Diameter | 45 mm |
| Weight | Approx. 8.2 kg |
| OEM Reference | ZF 2094.303.055 |
| Surface Hardness | HRC 58-62 |
Compatibility
This countershaft is specifically designed for the ZF WG100, WG130, and WG131 transmission models. It is also compatible with the closely related WG180 and WG200 series, though verification of spline count and bearing journal dimensions is recommended for those variants. The part interfaces directly with the 2094301036: HOUSING and the 2094298057: HOUSING to form the core gear train assembly. Additionally, the 2094301071: COVER seals the countershaft bearing cavity, preventing contamination. Always cross-reference your transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101012 | TRANSMISSION HOUSING | Encloses and supports all internal gear and shaft assemblies |
| 2094301036 | HOUSING | Provides bearing support for the countershaft and gear clusters |
| 2094298057 | HOUSING | Secondary housing section for auxiliary gear support |
| 2094301071 | COVER | Seals the countershaft bearing bore to retain lubrication |
| 0750111371 | SHAFT SEAL | Prevents oil leakage at the countershaft exit point |
| 0634303085 | O-RING | Provides static sealing between housing interfaces |
| 2094301030 | GASKET | Creates a leak-proof seal between transmission housing halves |
| 0631306670 | CYLINDRICAL PIN | Aligns and locates housing components during assembly |
| 0636011356 | HEXAGON SCREW | Secures housing and cover components with high clamping force |
| 4475280060 | SCREW PLUG | Seals oil passages and inspection ports in the transmission |
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