ZF 4644.121.112 OIL PIPE for WG201 | OEM Genuine Part

Overview

The ZF 4644.121.112 OIL PIPE is a precision-engineered fluid conduit designed specifically for the WG 201 series transmission. This OEM genuine part ensures the correct routing and delivery of hydraulic oil to critical lubrication points within the valve body and rotating clutch assemblies. Without a properly sealed oil pipe, internal pressure drops can compromise shift quality and heat dissipation. The SKU 4644.121.112 is manufactured to ZF’s exacting tolerances, guaranteeing a leak-free interface with the 4644101160: TRANSMISSION HOUSING and the 4644301323: TRANSMISSION HOUSING.

Symptoms of Failure

• External oil seepage at pipe joints: A worn or cracked 4644.121.112 oil pipe often causes visible fluid drips near the transmission bell housing, leading to low fluid levels and eventual overheating.
• Erratic gear engagement or slipping: When this pipe loses its seal, hydraulic pressure drops, resulting in delayed clutch pack application and noticeable gear slippage during acceleration.
• Whining or cavitation noise from the pump: A restricted or leaking oil pipe introduces air into the hydraulic circuit, producing a high-pitched whine as the pump struggles to maintain pressure.
• Burning smell from overheated transmission fluid: Insufficient oil flow due to a compromised pipe causes localized hot spots, often accompanied by a distinct burnt odor.

Technical Specifications

Compatibility

This oil pipe is primarily designed for the ZF WG 201 series, but it also fits earlier WG 180 and WG 200 variants due to shared hydraulic circuit architecture. It is a direct replacement for units using the 4644301189: THREADED BUSH and the 4475280043: SCREW PLUG in the same lubrication gallery. Always verify the pipe routing against your specific transmission housing casting number before installation.

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