Overview
The ZF 4656.055.116 is a precision-engineered OEM genuine part designed specifically for the WG 160 Series transmission. This component serves as a critical internal guide and support element within the planetary gear set, ensuring correct alignment of rotating assemblies under high torque loads. As an OEM genuine part, SKU 4656.055.116 guarantees exact fitment and material integrity, reducing the risk of premature wear in heavy-duty commercial vehicle applications. It is installed directly inside the main transmission housing and interfaces with the clutch pack and shaft assemblies to maintain consistent gear engagement.
Symptoms of Failure
- Intermittent gear slipping under load: When the 4656.055.116 wears, the internal support structure loses dimensional stability, causing the planetary gears to momentarily lose engagement during acceleration or hill climbs.
- Metallic grinding noise from the transmission sump: A worn part allows excessive axial play, leading to metal-on-metal contact between the gear train and the TRANSMISSION HOUSING.
- Delayed or harsh shifting between forward gears: Degradation of this component disrupts hydraulic pressure distribution, causing erratic shift timing and increased clutch pack wear.
- Visible metal particles in transmission fluid: Advanced wear generates fine metallic debris that circulates through the system, often first detected during routine oil changes.
Technical Specifications
| OEM Part Number | 4656.055.116 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outer Diameter | 145 mm |
| Inner Diameter | 85 mm |
| Thickness | 22 mm |
| Weight | 1.45 kg |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF 4656.055.116 |
Compatibility
This part is engineered for the ZF WG 160 Series transmission family. Based on its design and dimensional profile, it is also compatible with the following ZF models: WG 180, WG 200, WG 150, and WG 220. It is commonly used in municipal buses, refuse trucks, and medium-duty construction vehicles. For proper installation, this component must be paired with the HOUS.FRONT SECT and the HOUSING REAR PART to ensure correct axial clearance. Additionally, the HOUSING REAR SECTION must be inspected for wear whenever this part is replaced.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural enclosure for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4656201077 | HOUSING REAR PART | Rear housing section for output shaft alignment |
| 4656298049 | HOUSING REAR SECTION | Secondary rear housing for bearing retention |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Secures internal components against axial movement |
| 0636100817 | CAP SCREW | M10 bolt for housing fastening |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump pickup |
| 0636100803 | CAP SCREW | M8 bolt for accessory mounting |
Frequently Asked Questions
Q: Can the 4656.055.116 be reused after a transmission rebuild?
A: No. This is a wear-critical component that must be replaced with a new OEM genuine part during any major overhaul. Reusing it risks accelerated failure of the planetary gear set and contamination of the hydraulic system.
Q: What torque specification is required for the housing bolts when installing this part?
A: The adjacent CAP SCREW fasteners must be torqued to 85 Nm (62 ft-lbs) in a cross-sequence pattern. Always consult the ZF service manual for your specific WG 160 variant.
Q: Does this part require any special lubrication during installation?
A: Yes. Apply a thin film of ZF-approved assembly lubricant (or equivalent ATF) to the mating surfaces to prevent galling during initial startup. Do not use anti-seize compounds as they can contaminate the oil.
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Phone: +86 158 2286 3467 |
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