Overview
The ZF 4656.055.001 is a precision-engineered OEM genuine part designed specifically for the WG 160 Series transmission. This component plays a critical role in the hydraulic control circuit, ensuring proper fluid routing and pressure regulation within the gearbox assembly. As a direct OEM replacement, the SKU 4656.055.001 guarantees exact fitment and original ZF performance standards. It interfaces directly with the main casing and valve body, making it essential for maintaining shift quality and overall transmission integrity.
Symptoms of Failure
- Erratic or delayed gear engagement: When the 4656.055.001 wears out, you may notice hesitation or harsh engagement when shifting from neutral to drive or reverse.
- Internal transmission fluid leaks: A failing unit often results in fluid seepage around the TRANSMISSION HOUSING interface, leading to low fluid levels and overheating.
- Inconsistent hydraulic pressure: Operators may experience slipping under load or erratic shift timing, particularly in higher gears, as the part degrades.
- Unusual whining or grinding noises: Wear in this component can cause cavitation or restricted fluid flow, producing audible noise from the transmission sump area.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4656.055.001 |
| Material | High-grade aluminum alloy with hardened steel inserts |
| Weight | 1.45 kg (3.2 lbs) |
| Dimensions (L x W x H) | 185 mm x 95 mm x 65 mm |
| OEM Reference | ZF WG 160 Series |
| Seal Type | Integrated O-ring groove (replacement O-ring sold separately) |
Compatibility
This genuine ZF part is primarily engineered for the WG 160 Series transmission family. It is also compatible with select models in the WG 180 and WG 200 series where the hydraulic control block shares the same mounting pattern. Always verify your transmission serial number before ordering. The 4656.055.001 works in conjunction with the HOUS.FRONT SECT and the HOUSING REAR PART to form a sealed hydraulic chamber. For heavy-duty applications, it is also used alongside the HOUSING REAR PART (alternate variant) in certain WG 160 configurations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101038 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing for clutch pack |
| 4656201037 | HOUSING REAR PART | Rear housing for output shaft support |
| 4472239180 | HOUSING REAR PART | Alternate rear housing variant for WG 160 |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 4656301148 | FIXING PLATE | Secures valve body to housing |
| 0636100817 | CAP SCREW | M10 fastener for housing retention |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | M8 fastener for cover plate |
Frequently Asked Questions
Q: How do I know if the 4656.055.001 is the correct part for my WG 160 transmission?
A: Check the stamped serial number on your transmission’s data plate. The 4656.055.001 is used exclusively in WG 160 series units with hydraulic control blocks manufactured after 2010. If your transmission has a different prefix, consult our compatibility chart above.
Q: Can I replace this part without removing the entire transmission?
A: In most cases, yes. The 4656.055.001 is accessible after removing the transmission oil pan and valve body. However, we recommend replacing the CYLINDRICAL PIN and FIXING PLATE simultaneously to ensure proper alignment.
Q: What is the typical lifespan of this OEM part under normal operating conditions?
A: With proper maintenance and clean hydraulic fluid, the 4656.055.001 typically lasts 300,000 to 500,000 miles in on-highway applications. Harsh off-road use may reduce this interval by up to 40%.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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