Overview
The ZF 4657.103.446 OUTPUT for WG190 is a critical final-drive component engineered to transfer rotational force from the transmission’s planetary gearset to the driveline. Situated at the rear of the main casing, this OEM genuine part ensures precise torque delivery and smooth power flow in heavy-duty industrial applications. The SKU 4657.103.446 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn output assemblies in the WG 190 Series. When installed alongside the 4657101078: TRANSMISSION HOUSING, it forms a sealed, high-strength interface that withstands extreme loads and thermal cycling.
Symptoms of Failure
- Oil seepage at the rear output seal: A worn 4657.103.446 often causes fluid to weep from the output flange, leading to low transmission fluid levels and eventual overheating.
- Intermittent gear slippage under load: When the output assembly loses its press-fit integrity, operators may notice hesitation or momentary loss of drive torque during acceleration or climbing.
- Abnormal whining or grinding noises: Bearing wear within the output section produces a high-pitched whine that intensifies with vehicle speed, indicating imminent failure.
- Vibration through the chassis: A misaligned or damaged output component transmits harmonic vibrations into the driveline, often mistaken for universal joint issues.
Technical Specifications
| Part Number | 4657.103.446 |
| OEM Reference | ZF 4657.103.446 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.2 kg (9.3 lbs) |
| Output Spline Count | 24-tooth involute spline |
| Max Torque Capacity | 1,200 Nm |
| Seal Diameter | 85 mm |
Compatibility
This genuine ZF output assembly is specifically designed for the WG 190 Series transmission family. It is also compatible with the closely related WG180 and WG200 models when used with the correct housing adapters. The 4657.103.446 interfaces directly with the 4657201166: HOUS.FRONT SECT and the 4657201168: HOUSING REAR PART to create a fully sealed output chamber. For complete rebuilds, pair this part with the 4657298101: HOUSING REAR SECTION to restore original factory tolerances.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets |
| 4657201166 | HOUS.FRONT SECT | Forward section of the transmission housing |
| 4657201168 | HOUSING REAR PART | Rear housing section supporting output shaft |
| 4657298101 | HOUSING REAR SECTION | Complete rear housing assembly with bearing bores |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing dowel locations |
| 0636100801 | CAP SCREW | M10 flange bolt for housing fastening |
| 4656301148 | FIXING PLATE | Locking plate for output bearing retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump protection |
| 0636100803 | CAP SCREW | M12 hex bolt for heavy-duty housing joints |
Frequently Asked Questions
Q: Can the 4657.103.446 be installed without replacing the housing?
A: Yes, the output assembly is designed as a standalone service part. However, we strongly recommend inspecting the HOUSING REAR PART for wear or distortion before reassembly, as housing damage can accelerate output failure.
Q: What torque specification is required for the output flange nut?
A: ZF specifies a tightening torque of 180 Nm for the output flange retaining nut on the WG190 series. Always use a new CAP SCREW and apply thread locker to prevent loosening under vibration.
Q: How do I confirm this part fits my WG190 transmission?
A: Verify the 24-tooth spline count and the 85 mm seal diameter on your existing output. The 4657.103.446 is a direct OEM replacement for all WG190 variants built after 2012. For earlier models, check compatibility with the HOUSING REAR SECTION part number stamped on your transmission tag.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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