Overview
The ZF 4656.056.129 is a precision-engineered OEM genuine component specifically designed for the WG 160 Series transmission. This part serves as a critical interface element within the gearbox assembly, ensuring proper alignment and secure fastening of internal drivetrain components. As a factory-specification part, the SKU 4656.056.129 guarantees exact fitment and long-term durability under heavy-duty operating conditions. It works in conjunction with the TRANSMISSION HOUSING to maintain structural integrity during high-torque applications.
Symptoms of Failure
When the ZF 4656.056.129 begins to wear out, operators may notice specific performance degradation. Oil seepage around the transmission casing is a common early indicator, often mistaken for simple gasket failure. Abnormal gear engagement noise during shifting, particularly under load, signals that this component has lost its dimensional stability. Vibration at highway speeds can occur when the part no longer provides adequate support to the shaft assembly. Finally, intermittent loss of hydraulic pressure may develop, leading to delayed clutch pack application and reduced towing capacity.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4656.056.129 |
| Material | High-tensile alloy steel with anti-corrosion coating |
| Weight | 0.85 kg (1.87 lbs) |
| Overall Length | 142 mm |
| Outer Diameter | 68 mm |
| Bore Diameter | 32 mm |
| Hardness Rating | HRC 38-42 |
| Surface Finish | Ra 0.8 µm |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This genuine ZF part is primarily engineered for the WG 160 Series transmission family. It is also compatible with the WG 180 and WG 200 series models when used in conjunction with the HOUS.FRONT SECT and the HOUSING REAR PART. For certain heavy-duty applications, the HOUSING REAR PART (alternate variant) may be required to achieve proper clearance. Always verify your transmission’s serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101038 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4656201037 | HOUSING REAR PART | Rear section housing for output shaft |
| 4472239180 | HOUSING REAR PART | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Secures internal bearing assembly |
| 0636100817 | CAP SCREW | High-strength fastener for housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh filter for pre-filtering |
| 0636100803 | CAP SCREW | Fastener for filter housing cover |
Frequently Asked Questions
Q: Can the ZF 4656.056.129 be installed without removing the transmission?
A: In most cases, this part is accessible after removing the transmission pan and valve body. However, for WG 160 models with integrated coolers, partial transmission removal may be necessary to access the mounting points.
Q: How does this part interact with the TRANSMISSION HOUSING?
A: The 4656.056.129 acts as a locating dowel that ensures concentric alignment between the TRANSMISSION HOUSING and the internal clutch drum assembly. Any wear here directly affects shift timing.
Q: What torque specification should be used during installation?
A: ZF specifies 45 Nm (33 ft-lbs) for the retaining bolt, applied in a cross-pattern sequence. Always use a new locking compound on the threads to prevent loosening under vibration.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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