Overview
The ZF 0634.300.231 SHAFT SEAL is a critical sealing component engineered specifically for the WG 65 series transmission. This OEM genuine part prevents lubricant leakage at the output shaft interface, ensuring consistent hydraulic pressure and protecting internal gears from contamination. The SKU 0634.300.231 sits precisely between the rotating shaft and the stationary TRANSMISSION HOUSING, maintaining a tight barrier against debris and fluid loss. As a factory-specification seal, it guarantees dimensional accuracy and material resilience under high-torque conditions.
Symptoms of Failure
When the ZF 0634.300.231 shaft seal degrades, operators typically notice these specific failure indicators:
- Oil weeping at the shaft exit point: Visible fluid accumulation around the output flange signals seal lip wear, often leading to gradual transmission fluid loss.
- Gear engagement hesitation: Reduced hydraulic pressure from leaking oil can cause delayed or rough shifting, particularly under load.
- Contaminated transmission fluid: A compromised seal allows dirt and moisture to enter the housing, accelerating internal wear on bearings and clutches.
- Increased operating temperature: Low fluid levels from seal leakage reduce heat dissipation, causing the transmission to run hotter than normal.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0634.300.231 |
| Material | Nitrile rubber (NBR) with steel reinforcement |
| Inner Diameter | 65 mm |
| Outer Diameter | 85 mm |
| Width | 12 mm |
| Weight | 0.04 kg |
| OEM Reference | ZF 0634.300.231 |
| Seal Type | Single lip with garter spring |
Compatibility
This shaft seal is designed for the ZF WG 65 series, but its dimensions and sealing profile also make it suitable for several other ZF transmission models that share the same output shaft configuration. Compatible units include the WG180, WG200, and WG210 series, as well as the 4 WG 65 variant. When replacing the seal, always inspect the HOUSING bore for scoring or corrosion, and verify that the HEXAGON SCREW securing the flange is torqued to factory specifications. For complete assembly integrity, the 4 WG 65 model requires this seal as part of its standard rebuild kit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616000220 | 4 WG 65 | Complete transmission assembly for WG65 series |
| 4616101101 | TRANSMISSION HOUSING | Main structural casing housing all internal components |
| 0636011118 | HEXAGON SCREW | Fastener for securing flanges and covers |
| 4616301304 | HOUSING | Secondary housing component for clutch or valve assembly |
| 4616301309 | HOUSING | Alternate housing variant for specific WG65 configurations |
| 0630361069 | SEALING CAP | Protective cap for unused ports or sensor openings |
| 0636011038 | HEXAGON SCREW | M8 fastener for transmission mounting points |
| 0636016015 | HEXAGON SCREW | M10 fastener for heavy-duty flange connections |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for precise housing positioning |
| 0634313118 | O-RING | Static seal for housing joint faces |
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