Overview
The ZF 4656.105.403 AXLE DISCONNECTION is a critical actuation component engineered for the WG 160 Series transmission family. This OEM genuine part manages the precise engagement and disengagement of the front axle drive, allowing the vehicle to switch between 4×4 and 4×2 modes on demand. By isolating the axle when not required, it reduces parasitic drag, improves fuel economy, and minimizes wear on driveline components. The SKU 4656.105.403 is a direct factory replacement, ensuring exact fitment within the main transmission housing assembly. It works in concert with the 4656101056: TRANSMISSION HOUSING and the 4656201075: HOUS.FRONT SECT to form a sealed, high-pressure actuation circuit.
Symptoms of Failure
When the ZF 4656.105.403 begins to degrade, operators will notice distinct performance issues. Intermittent axle engagement or disengagement is the most common complaint, often accompanied by a grinding noise during shift attempts. Hydraulic fluid seepage around the actuator body indicates internal seal failure, leading to pressure loss. A third symptom is delayed response when toggling the 4×4 switch, where the system takes several seconds longer than normal to engage. Finally, dashboard warning lights for the driveline system may illuminate, triggered by position sensor mismatches within the disconnection unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.105.403 |
| OEM Reference | ZF 4656.105.403 |
| Material | Hardened Steel / Aluminum Alloy |
| Weight | 1.8 kg (approx.) |
| Length | 145 mm |
| Width | 85 mm |
| Height | 65 mm |
| Operating Pressure | 12-18 bar |
| Seal Type | PTFE / NBR O-Ring |
Compatibility
This axle disconnection unit is primarily designed for the WG 160 Series transmission. It is also compatible with the WG 180 and WG 200 series when used in conjunction with the correct 4656201077: HOUSING REAR PART and 4656298049: HOUSING REAR SECTION. It is not suitable for the WG 120 or WG 210 series without significant adapter modifications. Always verify your transmission model code before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656201075 | HOUS.FRONT SECT | Front section of the housing assembly |
| 4656201077 | HOUSING REAR PART | Rear housing segment for output shaft |
| 4656298049 | HOUSING REAR SECTION | Extended rear housing cover |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Retains actuator in position |
| 0636100817 | CAP SCREW | M10 fastener for housing bolts |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M8 fastener for cover plates |
Frequently Asked Questions
Q: Can the 4656.105.403 be repaired with a seal kit, or must it be replaced entirely?
A: While external seals can sometimes be replaced, internal wear on the spool valve and piston bore typically necessitates full replacement of the unit to ensure reliable pressure holding.
Q: Does this part require calibration after installation?
A: Yes, a basic position sensor calibration using a ZF diagnostic tool is recommended to synchronize the actuator stroke with the transmission control unit.
Q: Is the 4656.105.403 interchangeable with the earlier 4656.105.402 version?
A: No. The .403 revision includes an updated internal damping orifice and a different electrical connector pinout. Using the .402 version in a .403 application will cause fault codes.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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