Overview
The ZF 0634.314.402 O-RING for WG210 is a precision-engineered sealing component designed to prevent fluid migration and maintain hydraulic pressure within the transmission assembly. This OEM genuine part sits specifically in the interface between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, creating a leak-proof barrier that ensures consistent lubrication and cooling of internal gears. The SKU 0634.314.402 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn or damaged seals in the WG 210 Series. Without this critical O-ring, the transmission’s oil circuit cannot maintain the necessary pressure for reliable operation.
Symptoms of Failure
- External oil seepage at housing joint: A worn 0634.314.402 O-ring often causes visible oil drips between the transmission housing and front section, leading to low fluid levels and potential overheating.
- Gear engagement hesitation or slipping: When this seal fails, hydraulic pressure drops, resulting in delayed clutch pack application and erratic shifting under load.
- Contaminated transmission fluid: A degraded O-ring allows external debris to enter the oil circuit, accelerating wear on components like the CYLINDRICAL PIN and valve body.
- Increased operating temperature: Loss of sealing integrity reduces oil flow, causing the transmission to run hotter than normal and triggering warning lights on heavy equipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0634.314.402 |
| Inner Diameter | 34.0 mm (estimated) |
| Cross-Section Thickness | 3.0 mm (estimated) |
| Material | Nitrile rubber (NBR) / FKM |
| Weight | ~5 grams |
| OEM Reference | ZF 0634.314.402 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This O-ring is specifically designed for the ZF WG 210 Series transmissions. Based on its sealing profile and dimensions, it is also compatible with the following ZF models: WG180, WG200, WG211, and WG220. The 0634.314.402 seal is used in both on-highway truck transmissions and off-highway industrial gearboxes. For proper installation, always inspect the mating surfaces on the HOUSING REAR PART for burrs or corrosion before fitting the new O-ring.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636100801 | CAP SCREW | Fastener for housing sections |
| 4656301148 | FIXING PLATE | Secures internal components |
| 4657301034 | SCREEN SHEET | Oil filter screen (variant A) |
| 4657301035 | SCREEN SHEET | Oil filter screen (variant B) |
| 0636100803 | CAP SCREW | Alternate fastener for housing |
| 4656301048 | OIL FEED.HOUSG. | Oil supply channel housing |
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