Overview
The ZF 4657.185.055 ACCESSORIES component is a precision-engineered ancillary part designed specifically for the WG 191 Series transmission family. This OEM genuine accessory plays a critical role in maintaining the structural integrity and operational alignment of the gearbox assembly. It interfaces directly with the main casing and supports the secure mounting of internal hydraulic and mechanical systems. The SKU 4657.185.055 is a factory-specified replacement that ensures exact fitment and long-term durability, preventing premature wear in high-torque applications.
Symptoms of Failure
- Intermittent gear engagement delays: When the 4657.185.055 accessory degrades, operators may notice hesitation or rough shifting under load, often misdiagnosed as a clutch issue.
- Localized oil seepage around the bell housing: A worn accessory can compromise the seal interface, leading to slow but persistent fluid loss near the transmission housing.
- Unusual metallic rattling at low RPM: Loose or fatigued components cause vibration and noise, particularly during deceleration or idle.
- Increased play in the shift linkage: Mechanical slack develops as the accessory loses its dimensional stability, affecting precise gear selection.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4657.185.055 |
| Material | High-strength alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 45 mm x 30 mm |
| OEM Reference | ZF 4657.185.055 |
| Torque Rating | Up to 1,200 Nm |
Compatibility
This genuine ZF accessory is engineered for the WG 191 Series but also fits select models in the WG180, WG200, and WG210 transmission families. It is commonly used in municipal buses, medium-duty trucks, and off-highway equipment where the WG191 gearbox is specified. Always verify your transmission serial number against the OEM parts catalog to ensure correct application.
Related Components
When servicing the WG191 assembly, several companion parts are frequently replaced alongside the 4657.185.055. The 4657101049: TRANSMISSION HOUSING provides the main structural shell, while the 4657301130: HOUS.FRONT SECT and 4657301131: HOUSING REAR PART enclose the gear train. The 0631306816: CYLINDRICAL PIN ensures precise alignment during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657301130 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657301131 | HOUSING REAR PART | Rear section of the transmission housing |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636102489 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Mounting bracket for accessory components |
| 0636102463 | CAP SCREW | High-tensile bolt for critical joints |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic fluid |
| 0636115287 | CAP SCREW | Flanged fastener for oil pan |
| 4657301065 | PLATE | Reinforcement plate for load distribution |
Frequently Asked Questions
Q: How do I know if the 4657.185.055 accessory is failing?
A: Look for gradual oil seepage near the housing joint or a subtle change in shift quality. A visual inspection for cracks or deformation is recommended every 50,000 km.
Q: Can this part be used in a WG200 transmission?
A: Yes, it is compatible with WG200 and WG210 models, but always cross-reference your transmission serial number with the OEM fitment guide to avoid mismatch.
Q: Is the 4657.185.055 sold as a standalone item or in a kit?
A: It is supplied individually as an OEM genuine part. For a complete overhaul, consider pairing it with the housing and pin components listed above.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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