ZF 4616.123.042 PLANETARY DRIVE for WG65 | OEM Genuine Part

Overview

The ZF 4616.123.042 PLANETARY DRIVE is a critical torque-multiplying assembly within the WG65 series transmission. This OEM genuine part, identified by SKU 4616.123.042, sits directly between the torque converter and the output shaft cluster, converting high-speed turbine rotation into the low-speed, high-torque power required for heavy-duty industrial applications. As the central gear reduction unit, it interfaces with the 4616105402: OUTPUT to transfer rotational force downstream. Precision-ground planetary gears within this drive ensure smooth power flow and minimal backlash under extreme load conditions.

Symptoms of Failure

When the ZF 4616.123.042 PLANETARY DRIVE begins to degrade, operators typically notice these specific failure modes:

• Whining or grinding noise during gear engagement – Worn planetary pinions create a high-pitched metallic sound, especially under load, indicating internal gear tooth wear.
• Intermittent torque loss or gear slipping – A failing planetary carrier can cause the transmission to momentarily lose drive power, often described as “slipping out of gear” during acceleration.
• Metallic debris in transmission fluid – Flaking or spalling of the planetary gear surfaces contaminates the oil, visible as silver or bronze particles during routine fluid checks.
• Vibration at the output flange – Uneven wear in the planetary set transmits through the 4005303005: OUTPUT FLANGE, causing noticeable driveline shudder at specific RPM ranges.

Technical Specifications

Compatibility

This planetary drive is engineered specifically for the ZF WG 65 Series transmission family. It is a direct replacement for units found in the following models:

• ZF WG65
• ZF WG80 (with adapter housing)
• ZF WG120 (early production variants)
• ZF WG180 (when paired with specific output shaft configurations)
• ZF WG200 (limited to low-ratio applications)

Installation requires precise alignment with the 4616101119: TRANSMISSION HOUSING and secure fastening using 0636011038: HEXAGON SCREW hardware. Always verify the sun gear spline count matches your existing output shaft before ordering.

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