ZF 4656.105.402 AXLE DISCONNECTION for WG160/WG210 | OEM Genuine Part

Overview

The ZF 4656.105.402 Axle Disconnection unit is a critical hydraulic-mechanical component engineered for the WG160 and WG210 series transmissions. This OEM genuine part manages the selective engagement and disengagement of the front or rear axle, reducing parasitic drag and improving fuel efficiency in heavy-duty industrial vehicles. Positioned within the transfer case assembly, the 4656.105.402 acts as a clutch-style actuator that isolates the axle shaft when four-wheel drive is not required. The SKU 4656.105.402 is precision-machined to ZF factory tolerances, ensuring seamless integration with the 4656101032: TRANSMISSION HOUSING and the 4656201075: HOUS.FRONT SECT for reliable long-term operation.

Symptoms of Failure

When the ZF 4656.105.402 axle disconnection unit begins to wear, operators may notice specific performance issues. Intermittent axle engagement or disengagement is a common early sign, often accompanied by a grinding noise during shift transitions. Oil leaks around the transfer case housing frequently occur as internal seals degrade, leaving visible drips on the undercarriage. Another clear indicator is unexpected driveline vibration at highway speeds, caused by uneven load distribution when the axle fails to fully disengage. Finally, reduced fuel economy and increased transmission temperature can signal that the unit is dragging, forcing the drivetrain to work harder than necessary.

Technical Specifications

Compatibility

This axle disconnection unit is specifically designed for ZF WG160 and WG210 series transmissions. Based on its mechanical interface and hydraulic specifications, the 4656.105.402 is also compatible with the WG180 and WG200 models, provided the transfer case housing matches the mounting pattern. It integrates directly with the 4656201034: HOUSING REAR PART and the 4472239177: HOUSING REAR PART to complete the rear driveline seal. Always verify the spline count and actuator bore diameter before installation.

Related Components

Frequently Asked Questions

Q: Can the 4656.105.402 be rebuilt, or must it be replaced?
A: This OEM genuine part is a sealed hydraulic actuator. While internal seals can sometimes be serviced, ZF recommends full replacement to maintain precise engagement timing and avoid contamination. The 4656.105.402 is designed as a non-serviceable unit for maximum reliability.

Q: What tools are required to install the axle disconnection unit?
A: Installation requires a 12-point socket set, a torque wrench capable of 80–120 Nm, and a seal driver for the O-rings. You will also need to align the unit with the 4656201075: HOUS.FRONT SECT using the 0631306816: CYLINDRICAL PIN for proper indexing.

Q: How does a failing axle disconnect affect transmission oil pressure?
A: A worn 4656.105.402 often causes internal leakage, dropping hydraulic pressure by 3–5 bar. This can trigger fault codes in the TCU and lead to delayed engagement. Checking the 4681301040: OIL FEED.HOUSG. for blockages is recommended during diagnosis.