Overview
The ZF 0634.306.084 O-RING is a critical static sealing component engineered for the WG200 and WG65 series transmissions. This OEM genuine part sits within the transmission housing interface, forming a leak-proof barrier between mating surfaces to prevent fluid migration and pressure loss. As a precision elastomeric seal, the SKU 0634.306.084 ensures the hydraulic circuit maintains its integrity during high-torque operations. When installed alongside the TRANSMISSION HOUSING, this O-ring guarantees that oil remains contained within the gear train, protecting adjacent components from contamination and wear.
Symptoms of Failure
- External oil seepage at housing joints: A degraded 0634.306.084 O-ring often causes visible fluid accumulation around the transmission case seam, particularly during cold starts or after extended idle periods.
- Gradual pressure drop during gear engagement: Worn seals allow hydraulic fluid to bypass, resulting in delayed clutch pack application and a spongy shift feel under load.
- Contaminated transmission fluid: A failing O-ring permits external debris ingress, leading to dark, gritty oil and accelerated wear on internal components like the FILTER INSERT.
- Audible whining from the pump circuit: Air ingestion through a compromised seal creates cavitation noise, often mistaken for bearing failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0634.306.084 |
| Inner Diameter (ID) | 84.0 mm (estimated) |
| Cross-Section (CS) | 3.0 mm (estimated) |
| Material | Nitrile Butadiene Rubber (NBR), 70 Shore A |
| Weight | ~8 grams |
| OEM Reference | ZF 0634.306.084 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This O-ring is directly compatible with ZF WG200 and WG65 series transmissions, including the WG180, WG200, and WG65 variants. It is also used in certain WG120 and WG150 models where the housing interface shares the same groove dimensions. For proper installation, the HEXAGON SCREW (0636011038) and HEXAGON SCREW (0636011118) must be torqued to specification to avoid distorting the seal. Additionally, the HEXAGON SCREW (0636016015) secures the cover plate that compresses this O-ring against the housing face.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101089 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 0636011038 | HEXAGON SCREW | Fastener for housing cover retention |
| 0636011118 | HEXAGON SCREW | Mounting bolt for valve body attachment |
| 0636016015 | HEXAGON SCREW | Secures oil pan to transmission case |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0634313118 | O-RING | Seal for hydraulic circuit passages |
| 0636304019 | SCREW PLUG | Closes oil drain or test ports |
| 0634801152 | SEALING RING | Gasket for flange connections |
| 0732611049 | FILTER INSERT | Traps particulate contaminants in oil flow |
| 0634303718 | O-RING | Secondary seal for pressure regulator bore |
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