Overview
The ZF 4656.103.428 OUTPUT for WG160/WG171 is a critical driveline component engineered to transfer rotational force from the transmission’s planetary gear set to the output shaft. Positioned at the rear of the gearbox housing, this OEM genuine part ensures precise torque delivery and maintains the structural integrity of the final drive assembly. The SKU 4656.103.428 is machined from high-strength alloy steel to withstand continuous heavy-load cycles in commercial vehicles and industrial machinery. When paired with the TRANSMISSION HOUSING, it forms a sealed unit that prevents contamination from entering the gear train.
Symptoms of Failure
- Oil seepage at the rear seal interface: A worn 4656.103.428 output often causes transmission fluid to leak past the output shaft seal, leaving visible puddles under the vehicle.
- Gear slipping under load: When the output splines wear, the connection to the driveshaft becomes loose, resulting in intermittent power loss during acceleration or hill climbing.
- Vibration or driveline shudder: A damaged output can create radial runout, producing low-frequency vibrations that intensify at highway speeds.
- Metallic debris in the oil pan: Flaking or spalling of the output surface introduces fine metal particles into the lubrication system, often detected during routine fluid changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.103.428 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 185 mm |
| Outer Diameter | 95 mm |
| Spline Count | 28 involute splines |
| Weight | 2.4 kg |
| OEM Reference | ZF 4656.103.428 |
Compatibility
This output is primarily designed for the ZF WG160 and WG171 series transmissions, which are widely used in municipal trucks, fire apparatus, and off-highway equipment. It also fits select variants of the WG180 and WG200 gearboxes when the rear housing configuration matches. For proper installation, the output must be aligned with the HOUS.FRONT SECT and the HOUSING REAR PART to maintain correct bearing preload. In WG171 applications, the HOUSING REAR SECTION provides additional support for the output shaft under high-torque conditions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Encloses the gear train and supports the output assembly |
| 4656201075 | HOUS.FRONT SECT | Front housing section that aligns the input shaft |
| 4656201077 | HOUSING REAR PART | Rear housing segment that positions the output bearing |
| 4656298049 | HOUSING REAR SECTION | Extended rear housing for WG171 applications |
| 0631306816 | CYLINDRICAL PIN | Locates the output flange during assembly |
| 4656301148 | FIXING PLATE | Secures the output shaft axial play |
| 0636100817 | CAP SCREW | Fastens the fixing plate to the housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter for the lubrication circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for the oil pump |
| 0636100803 | CAP SCREW | M10 bolt for housing flange connections |
Frequently Asked Questions
Q: Can the 4656.103.428 output be used in a ZF WG200 transmission?
A: Yes, it is mechanically compatible with WG200 gearboxes that share the same rear housing interface, but you must verify that the HOUSING REAR PART matches the output spline length.
Q: What torque specification is required for the output shaft nut?
A: The retaining nut should be tightened to 350 Nm using a thread-locking compound. Always replace the CAP SCREW that secures the fixing plate after removal.
Q: How do I identify a genuine ZF output versus an aftermarket copy?
A: Genuine parts have a laser-etched ZF logo and the full part number 4656.103.428 on the flange face. Counterfeit units often lack the case-hardening depth required for heavy-duty cycles.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
