Overview
The ZF 4651.103.409 OUTPUT for WG100 is a critical driveline component engineered to transfer rotational force from the transmission’s final planetary gearset to the output flange or driveshaft. Positioned at the rear of the gearbox housing, this OEM genuine part ensures precise torque delivery and maintains the structural integrity of the power take-off interface. The SKU 4651.103.409 is manufactured to ZF’s exacting tolerances, utilizing high-strength alloy steel to withstand the cyclic loads common in heavy-duty industrial applications. This output shaft works in concert with the 4651101009: TRANSMISSION HOUSING to maintain proper alignment and bearing preload, while the 0634303928: O-RING provides a critical seal against fluid migration at the shaft-to-housing interface.
Symptoms of Failure
When the ZF 4651.103.409 OUTPUT begins to degrade, operators will notice distinct operational anomalies. Oil leaks at the rear output seal are the most common early indicator, often caused by shaft surface wear or pitting. Vibration during load application signals spline wear or bearing journal damage, which can escalate into gear slipping under heavy torque as the output shaft loses its positive engagement with the planetary carrier. A less obvious but equally critical symptom is erratic speed sensor readings, as the tone wheel or reluctor ring attached to this shaft may become damaged, triggering fault codes in the transmission control module.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4651.103.409 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 385 mm (estimated) |
| Shaft Diameter (bearing journal) | 55 mm (estimated) |
| Spline Count | 24 involute splines |
| Weight | 4.8 kg (estimated) |
| OEM Reference | ZF 4651.103.409 |
| Surface Treatment | Black oxide / phosphate coating |
Compatibility
This output shaft is specifically designed for the ZF WG 100 Series transmission family, including the WG100, WG120, and WG150 models commonly found in municipal trucks, fire apparatus, and medium-duty construction vehicles. It is not interchangeable with the larger WG180 or WG200 series output shafts, which utilize a different spline pitch and bearing diameter. The 4651301025: HOUSING and 4651301031: HOUSING components are direct structural mates for this output assembly, ensuring correct axial positioning within the transmission case.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101009 | TRANSMISSION HOUSING | Main structural case housing the output shaft assembly |
| 4651301025 | HOUSING | Rear bearing support housing for output shaft |
| 0634303928 | O-RING | Static seal between output shaft housing and main case |
| 4651301031 | HOUSING | Intermediate housing for output shaft bearing pack |
| 4651203002 | SCREEN SHEET | Oil strainer protecting output shaft lubrication circuit |
| 4651303005 | SCREEN SHEET | Secondary filtration screen for output area |
| 0636101032 | CAP SCREW | Fastener securing output shaft bearing retainer |
| 0630361028 | SEALING CAP | Protective cap for output shaft speed sensor port |
| 4475280060 | SCREW PLUG | Oil drain plug for output shaft cavity |
| 0634303312 | O-RING | Seal for screw plug in output housing |
