Overview
The ZF 4656.056.155 is a precision-engineered OEM genuine component specifically designed for the WG 160 Series transmission. This part functions as a critical internal guide and support element within the hydraulic control system, ensuring proper fluid routing and pressure regulation during gear shifts. The SKU 4656.056.155 is manufactured to ZF’s exacting tolerances, making it essential for maintaining the integrity of the valve body assembly. When installed correctly, this part directly influences shift quality and overall transmission longevity by preventing cross-leakage between hydraulic circuits.
Symptoms of Failure
- Erratic shifting or delayed engagement: A worn 4656.056.155 can cause inconsistent hydraulic pressure, leading to harsh or delayed gear changes, especially under load.
- Transmission fluid leaks near the valve body: Deterioration of this component often results in external oil seepage around the control unit, leaving visible drips on the housing.
- Intermittent gear slipping: When this part loses its sealing capability, you may experience random loss of drive in specific gears, particularly during acceleration.
- Contaminated transmission fluid: Internal wear particles from a failing 4656.056.155 can circulate through the system, causing debris buildup in the filter and cooler lines.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4656.056.155 |
| OEM Reference | ZF 4656.056.155 |
| Material | High-strength aluminum alloy with hardened steel inserts |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 145 mm x 68 mm x 32 mm |
| Surface Finish | Anodized with precision-ground sealing surfaces |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This genuine ZF 4656.056.155 part is primarily engineered for the WG 160 Series transmission family. Based on its design and function, it is also compatible with the WG 180 and WG 200 models that share the same hydraulic control architecture. Additionally, it may be used in certain WG 150 and WG 220 variants where the valve body configuration matches. Always verify your transmission serial number before installation to ensure correct fitment.
Related Components
When servicing the WG 160 Series, several companion parts are typically replaced alongside the 4656.056.155 to ensure optimal performance. The TRANSMISSION HOUSING (4656101057) provides the structural foundation, while the HOUS.FRONT SECT (4656201075) and HOUSING REAR PART (4656201078) enclose the gear train. For complete rear coverage, the HOUSING REAR SECTION (4656298050) is also essential.
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4656201078 | HOUSING REAR PART | Rear housing component for output shaft |
| 4656298050 | HOUSING REAR SECTION | Additional rear section for extended models |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing positioning |
| 4656301148 | FIXING PLATE | Retaining plate for internal component security |
| 0636100817 | CAP SCREW | Fastener for housing assembly |
| 4656301016 | SCREEN SHEET | Fine mesh filter for fluid debris protection |
| 4656301017 | SCREEN SHEET | Secondary mesh filter for high-flow circuits |
| 0636100803 | CAP SCREW | Mounting screw for valve body attachment |
Frequently Asked Questions
Q: How do I know if the 4656.056.155 is the correct replacement for my WG 160 transmission?
A: Verify your transmission’s serial number plate, typically located on the left side of the main housing. The 4656.056.155 is used in WG 160 models produced after 2012. Cross-reference your existing part’s markings with the OEM number before ordering.
Q: Can I install this part without replacing the associated housing components?
A: While possible, we strongly recommend inspecting the TRANSMISSION HOUSING and HOUS.FRONT SECT for wear. Reusing damaged housings can lead to premature failure of the new 4656.056.155 component.
Q: What torque specifications should I use for the cap screws when installing this part?
A: For the associated CAP SCREW (0636100817) and CAP SCREW (0636100803), apply 25 Nm (18.4 ft-lbs) in a crisscross pattern. Always use a calibrated torque wrench to avoid housing distortion.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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