ZF 0634.306.010 O-RING for WG100/WG160/WG190 | OEM Genuine Part

Overview

The ZF 0634.306.010 O-RING is a critical sealing component engineered for the WG100, WG160, and WG190 series transmissions. This OEM genuine part, identified by SKU 0634.306.010, sits between the differential housing and the axle assembly to prevent fluid migration and maintain hydraulic pressure. Constructed from high-grade nitrile rubber, it ensures a leak-proof seal under extreme thermal cycling and high-pressure conditions. When replacing this seal, it is common to also inspect the 5838300626: DIFFERENTIAL HOUSING for cracks or warping, as housing deformation can accelerate O-ring failure.

Symptoms of Failure

• External oil seepage at the axle-to-housing joint – A visible wet spot or drip near the differential mounting flange indicates the O-ring has hardened or cracked.
• Low transmission fluid level without visible pan leaks – If the fluid level drops but no puddle forms under the pan, the leak is likely migrating through the 5838109012: DIFFERENTIAL seal interface.
• Whining or chattering noise during turns – Fluid loss from a failed O-ring can starve the 0750117075: TAPER ROLLER BEARING, causing metal-on-metal contact.
• Intermittent gear engagement delay – Air ingestion through a compromised seal reduces hydraulic pressure, leading to sluggish shifts.

Technical Specifications

Compatibility

This O-ring is a direct fit for ZF WG-series transmissions, specifically the WG100, WG160, WG190, WG191, WG210, WG211, WG230, WG261, WG310, and WG311 models. It is also compatible with the WG180 and WG200 variants when used in conjunction with the 2093209023: DIFFERENTIAL assembly. Always verify the groove depth in your differential housing before installation, as excessive wear may require replacement of the entire housing unit.

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