ZF 4143.221.013 THROTTLE VALVE for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4143.221.013 Throttle Valve is a precision-machined component responsible for modulating hydraulic pressure within the valve body assembly of ZF WG series transmissions. This OEM genuine part, identified by SKU 4143.221.013, directly controls the flow of transmission fluid to regulate shift timing and clutch engagement pressure. Positioned inside the main control housing, it works in concert with the 4143101009 HOUSING and the 4143301025 HOUSING to ensure precise hydraulic circuit routing. Without a properly functioning throttle valve, the transmission cannot achieve correct line pressure modulation, leading to degraded shift quality.

Symptoms of Failure

• Delayed or harsh shifting under load: A worn throttle valve fails to regulate pressure correctly, causing noticeable hesitation or jarring gear changes when accelerating.
• Erratic idle or creeping: Internal leakage past the valve spool leads to inconsistent hydraulic pressure at low engine speeds, resulting in unpredictable vehicle movement at stoplights.
• Transmission overheating: A stuck or sticking throttle valve forces the transmission to operate at elevated pressures, generating excess heat that can damage seals and clutches.
• Oil leaks near the valve body: Degraded sealing surfaces allow ATF to bypass the valve, often accompanied by fluid seepage around the 0634313603 O-RING and the 4475280018 SCREW PLUG.

Technical Specifications

Compatibility

This throttle valve is engineered for ZF WG series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with the HL 100 Series and HL 270 Series valve bodies. While primarily designed for these models, the 4143.221.013 may be used in WG180 and WG200 transmissions when paired with the correct 4143298457 SEAL KIT. Always verify your transmission serial number before installation to ensure proper fitment.

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