Overview
The ZF 0634.309.030 SHAFT SEAL is a critical dynamic sealing component engineered specifically for the WG 65 Series transmission. This OEM genuine part prevents pressurized transmission fluid from escaping at the output shaft interface, ensuring consistent lubrication of internal gears and bearings. Positioned at the rear of the gearbox, the seal interfaces directly with the OUTPUT FLANGE to maintain a leak-proof barrier. The SKU 0634.309.030 is the exact factory-specified replacement for maintaining original equipment performance and preventing contamination ingress.
Symptoms of Failure
- Oil leaking from output shaft area: A worn 0634.309.030 seal allows transmission fluid to weep past the rotating shaft, often visible as drips under the vehicle or wetness around the bell housing.
- Low transmission fluid level without visible external damage: Gradual seal degradation can cause slow fluid loss, leading to erratic shifting or delayed engagement as the hydraulic pressure drops.
- Gear slipping under load: When the shaft seal fails, internal pressure loss reduces clutch pack engagement, causing the transmission to slip during acceleration or hill climbing.
- Contaminated fluid or debris near the output flange: A compromised seal allows dirt and moisture to enter the transmission, which can accelerate wear on the OUTPUT shaft and bearings.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0634.309.030 |
| Type | Radial Lip Shaft Seal |
| Inner Diameter (ID) | 65 mm (estimated) |
| Outer Diameter (OD) | 85 mm (estimated) |
| Width | 10 mm (estimated) |
| Material | Nitrile Rubber (NBR) with steel case |
| Weight | 0.04 kg (approx.) |
| OEM Reference | ZF 0634.309.030 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This shaft seal is primarily designed for the WG 65 Series transmission family. Based on its sealing profile and dimensions, it is also compatible with the following ZF models: WG180, WG200, WG210, and WG250. It fits directly onto the output shaft housing where the TRANSMISSION HOUSING meets the output flange. For proper installation, use the HEXAGON SCREW (0636011038) to secure the retaining plate. Always verify the seal lip orientation matches the original assembly to prevent premature failure.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from transmission to driveline |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to driveshaft |
| 4616101117 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011038 | HEXAGON SCREW | Fastens seal retaining plate |
| 0636016015 | HEXAGON SCREW | Secures housing components |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for assembly |
| 0634313118 | O-RING | Seals static housing joints |
| 0732611049 | FILTER INSERT | Traps debris in hydraulic circuit |
| 0634303718 | O-RING | Seals oil cooler connections |
| 0636610082 | STUD | Threaded rod for mounting brackets |
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