ZF 4651.121.006 OIL PIPE for WG100 | OEM Genuine Part

Overview

The ZF 4651.121.006 OIL PIPE is a precision-engineered fluid conduit specifically designed for the WG 100 series transmission family. This OEM genuine part, identified by SKU 4651.121.006, routes pressurized hydraulic oil between the valve body and the rotating clutch drums within the transmission sump. By maintaining a consistent, unrestricted flow of lubricant, this pipe ensures that critical bearing surfaces and gear sets receive adequate cooling and hydraulic pressure. It is a direct replacement component that interfaces with the TRANSMISSION HOUSING to seal the lubrication circuit.

Symptoms of Failure

When the ZF 4651.121.006 OIL PIPE deteriorates, operators often notice distinct operational issues. Hydraulic oil leaks from the pipe body or its connection points are the most common failure mode, often appearing as drips under the bell housing. Erratic gear engagement or delayed shifting occurs when the pipe cracks, causing a drop in line pressure to specific clutches. A whining or humming noise from the transmission pan area indicates cavitation due to restricted oil flow through a deformed pipe. Finally, overheating of the transmission fluid can result from insufficient lubrication reaching the planetary gear sets, a direct consequence of a compromised oil pipe.

Technical Specifications

Compatibility

This oil pipe is engineered for the ZF WG 100 series, but its hydraulic routing design makes it applicable to several related models. It is a direct fit for the WG 100, WG 120, and WG 150 transmissions. It also serves as a service part for the WG 180 and WG 200 series when replacing the main oil distribution assembly. The pipe is designed to seat securely within the HOUSING and the HOUSING cover, where it is sealed using the O-RING to prevent cross-port leakage.

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