ZF 0634.306.295 O-RING for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0634.306.295 O-RING is a precision-engineered sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part sits within the hydraulic control system, forming a critical barrier between the 4143101009 HOUSING and adjacent valve body assemblies. By maintaining a leak-proof seal under high-pressure oil circulation, the 0634.306.295 O-RING ensures consistent clutch engagement and prevents cross-contamination between fluid circuits. As an OEM-sourced component, this seal guarantees exact dimensional tolerances for long service intervals in heavy-duty industrial applications.

Symptoms of Failure

• External oil seepage around housing joints – A worn 0634.306.295 O-RING often causes visible fluid drips near the 4143301025 HOUSING interface, particularly after thermal cycling.
• Erratic gear engagement under load – When this seal degrades, internal pressure loss leads to delayed or harsh shifting, especially in WG130 models during low-speed maneuvers.
• Transmission overheating warnings – Compromised sealing allows hot oil to bypass coolers, triggering temperature alerts on dash displays.
• White smoke from breather vents – Failed O-rings permit oil migration into the bell housing, burning off as smoke during operation.

Technical Specifications

Compatibility

This O-ring is specifically validated for ZF WG-series powershift transmissions used in construction and agricultural machinery. Primary compatibility includes:

• ZF WG100 – All variants (2-speed and 4-speed configurations)
• ZF WG130 – Standard and heavy-duty versions
• ZF WG131 – With integrated torque converter
• ZF WG180 – Limited compatibility (verify housing bore diameter)
• ZF WG200 – Requires cross-reference with 0634313603 O-RING for dual-seal assemblies

For installations involving the 4475280018 SCREW PLUG, always replace this O-ring simultaneously to prevent thread-path leaks.

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