ZF 0634.313.466 O-RING for WG258/WG261/WG308 | OEM Genuine Part

Overview

The ZF 0634.313.466 O-RING is a critical sealing component engineered for the WG258, WG261, WG308, and related ZF powershift transmission series. This OEM genuine part, identified by SKU 0634.313.466, sits precisely between the transmission housing and the cover assembly, forming a leak-proof barrier that prevents hydraulic fluid migration and contamination ingress. In high-torque industrial applications, this O-ring maintains the internal pressure integrity required for consistent clutch engagement and gear selection. When installed alongside a TRANSMISSION HOUSING, it ensures the entire assembly remains sealed under extreme thermal cycling and vibration loads.

Symptoms of Failure

When the ZF 0634.313.466 O-RING degrades, operators typically notice these specific failure indicators:

• External hydraulic oil leaks around the housing-to-cover interface, often appearing as drips or wet spots on the transmission casing.
• Intermittent gear slipping under load, caused by pressure loss in the clutch circuits due to compromised sealing.
• Contaminated transmission fluid as dirt and moisture bypass the failed seal, leading to accelerated wear of internal components.
• Erratic shift timing or delayed engagement, particularly in cold-start conditions where the seal has hardened or cracked.

Technical Specifications

Compatibility

This O-ring is specifically designed for ZF’s WG series powershift transmissions. Verified compatible models include:

• WG 258 Series (all variants)
• WG 260 Series
• WG 261 Series
• WG 308 Series
• WG 311 Series
• WG 180 Series (with adapter housing)
• WG 200 Series (early production)

During installation, always pair this seal with a new HOUSING gasket surface and secure the assembly using HEXAGON SCREW fasteners torqued to specification. For final closure, the CAP SCREW must be tightened in a cross-pattern sequence to prevent seal distortion.

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