Overview
The ZF 4644.108.233 COUNTERSHAFT is a critical internal component engineered specifically for the WG 201 Series transmission. This genuine OEM part serves as the primary torque-transferring shaft, synchronizing gear rotation within the main drive assembly. The SKU 4644.108.233 is precision-machined to maintain exact gear mesh alignment, ensuring smooth power delivery and reducing internal vibration. It sits centrally within the transmission housing, interfacing directly with the 4644101172: TRANSMISSION HOUSING and the 4644301390: TRANSMISSION HOUSING to form the core structural backbone of the gear train.
Symptoms of Failure
When the ZF 4644.108.233 COUNTERSHAFT begins to wear, operators often report gear slipping under load, particularly during uphill climbs or heavy hauling. A second common symptom is a persistent whining or grinding noise emanating from the transmission case, which intensifies with speed. Third, you may notice difficulty engaging specific gears, especially when shifting from neutral to drive. Finally, metal particles in the transmission fluid are a clear indicator of countershaft bearing surface degradation, requiring immediate replacement to avoid cascading damage to the 0636302005: SCREW PLUG and surrounding seals.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.108.233 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 485 mm (estimated) |
| Journal Diameter | 45 mm (estimated) |
| Weight | 8.2 kg (estimated) |
| OEM Reference | ZF 4644.108.233 |
| Surface Treatment | Nitrided for wear resistance |
Compatibility
This ZF 4644.108.233 COUNTERSHAFT is primarily designed for the WG 201 Series transmission family. Based on its spline count and bearing journal dimensions, it is also compatible with the WG180, WG200, and select WG210 variants. It directly replaces worn shafts in these models without requiring housing modifications. For proper installation, ensure the 4644301189: THREADED BUSH is torqued to specification, as it secures the countershaft end-play within the transmission case.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101172 | TRANSMISSION HOUSING | Encloses and supports the countershaft assembly |
| 4644301390 | TRANSMISSION HOUSING | Secondary housing section for gear alignment |
| 4644301189 | THREADED BUSH | Secures countershaft axial position |
| 0636302005 | SCREW PLUG | Seals oil passages near the countershaft |
| 0634306198 | O-RING | Prevents fluid leakage at housing joints |
| 0634801098 | SEALING RING | Provides static seal on countershaft bore |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Mounting fastener for housing sections |
| 4644301161 | COVER PLATE | Protects countershaft access opening |
| 0636100621 | HEXAGON SCREW | Secures cover plate and bushings |
