Overview
This genuine OEM part, the ZF 4656.056.184, is a critical internal component engineered specifically for the WG 160 series transmission. It functions as a precision-machined guide or actuator element within the valve body or clutch pack assembly, ensuring accurate hydraulic fluid routing for smooth gear engagement. The SKU 4656.056.184 is a direct factory replacement, designed to restore original shift quality and prevent internal pressure loss. It sits adjacent to the main structural castings, including the TRANSMISSION HOUSING, which encloses the entire rotating assembly.
Symptoms of Failure
When the 4656.056.184 component begins to wear, operators often notice distinct performance degradation. Common failure symptoms include:
- Delayed or harsh shifting: Worn internal surfaces cause erratic hydraulic pressure, leading to hesitation between gears.
- Intermittent gear slipping: The part may fail to hold line pressure, causing the transmission to momentarily lose drive under load.
- Internal oil leaks: Cracks or wear on the sealing face allow ATF to bypass, resulting in low fluid levels and overheating.
- Unusual whining or grinding noises: Metal-on-metal contact from a degraded component generates audible distress during operation.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4656.056.184 |
| Material | Hardened Steel / Sintered Alloy |
| Weight | 0.45 kg (approx.) |
| Dimensions (L x W x H) | 85 mm x 40 mm x 25 mm |
| Surface Finish | Ground & Phosphated |
| OEM Reference | ZF WG 160 Series |
Compatibility
This genuine part is primarily designed for the ZF WG 160 series transmission. It is also compatible with select models in the WG 180 and WG 200 families that share the same valve body architecture. Always verify your transmission serial number before installation. The part interfaces directly with the HOUS.FRONT SECT and the HOUSING REAR PART, forming a sealed hydraulic circuit. For heavy-duty rebuilds, the HOUSING REAR SECTION is often replaced concurrently to ensure complete assembly integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656201075 | HOUS.FRONT SECT | Front section housing pump and converter |
| 4656201078 | HOUSING REAR PART | Rear housing for output shaft support |
| 4656298050 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Retains valve body components |
| 0636100817 | CAP SCREW | High-tensile fastener for housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Secondary filter for valve body |
| 0636100803 | CAP SCREW | Fastener for rear housing section |
Frequently Asked Questions
Q: Can the 4656.056.184 be installed without removing the transmission?
A: In most WG 160 applications, this part is accessible after dropping the valve body or side cover. However, full removal of the transmission is recommended for thorough cleaning and inspection of the TRANSMISSION HOUSING.
Q: How do I confirm this part is genuine OEM and not an aftermarket copy?
A: Genuine ZF parts carry a laser-etched part number (4656.056.184) and a specific surface phosphate coating. Counterfeit parts often lack the precise dimensional tolerances required for proper sealing.
Q: What torque specification should I use for the retaining bolts?
A: Always refer to the ZF service manual for the WG 160 series. Typical values range from 18-22 Nm for M6 cap screws like the CAP SCREW used in this assembly.
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Phone: +86 158 2286 3467 |
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