ZF 4646.253.019 DISC CARRIER for WG251 | OEM Genuine Part

Overview

The ZF 4646.253.019 DISC CARRIER is a critical internal component engineered for the WG 251 Series transmission. This genuine OEM part functions as the central hub that supports and aligns the clutch disc packs within the planetary gearset. By maintaining precise axial positioning, the disc carrier ensures smooth torque transfer and consistent hydraulic pressure distribution across the friction plates. The SKU 4646.253.019 is machined from high-strength alloy steel to withstand the extreme rotational forces and thermal loads present in heavy-duty commercial vehicle transmissions. This carrier interfaces directly with the 4646101072: TRANSMISSION HOUSING and the 4646301201: HOUSING to form a sealed, pressurized chamber for clutch actuation.

Symptoms of Failure

• Delayed or harsh gear engagement: When the disc carrier splines wear, the clutch packs cannot seat properly, causing noticeable lag or jerking during shifts—a common search query for “ZF WG251 hard shifting.”
• Progressive loss of forward or reverse drive: A cracked carrier face allows clutch pack slippage under load, leading to “transmission slipping in gear” complaints, especially during uphill climbs.
• Metallic debris in transmission fluid: Worn carrier bearing journals generate fine steel particles that contaminate the oil, often flagged during “ZF transmission metal shavings” diagnostic searches.
• Hydraulic pressure fluctuations: Distortion of the carrier’s sealing surface causes internal leakage, triggering “low clutch pressure” fault codes in electronic control units.

Technical Specifications

Compatibility

This disc carrier is specifically designed for the ZF WG 251 Series, but it also shares dimensional standards with the WG180, WG200, and WG210 transmission models used in municipal trucks, refuse vehicles, and construction equipment. The 4646.253.019 carrier is compatible with all variants of the WG251, including the WG251C and WG251E. For proper installation, it must be paired with the 4646301166: COVER and secured using the 0636101051: CAP SCREW kit. Always verify spline count and pilot bore dimensions against your existing carrier before ordering.

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