Overview
The ZF 4657.104.412 DIFFERENTIAL is a critical torque-distributing assembly designed for the WG 190 and WG 210 series powershift transmissions. This OEM genuine part, identified by SKU 4657.104.412, sits within the rear axle drive housing and is responsible for splitting engine torque between the left and right output shafts while allowing for speed differences during turns. In the WG 210 transmission architecture, this differential works in concert with the 4657101080: TRANSMISSION HOUSING and the 4657201167: HOUS.FRONT SECT to ensure smooth power delivery under heavy industrial loads. Precision-machined from high-strength alloy steel, this component is engineered to withstand the extreme torsional stresses found in construction and agricultural machinery.
Symptoms of Failure
- Whining or howling noise during turns: When the differential gears or bearings wear, a distinct metallic whine becomes audible, especially during low-speed cornering. This is a classic sign of gear tooth surface fatigue.
- Oil leaks from the axle housing: Worn seals or a cracked differential case can cause transmission fluid to weep from the housing joint, often leaving visible drips under the vehicle after operation.
- Uneven wheel spin or loss of traction: A failing differential may allow one wheel to spin freely while the other remains stationary, indicating internal gear slippage or a broken spider gear shaft.
- Clunking or grinding on acceleration: Excessive backlash in the differential gears produces a pronounced clunk when shifting from drive to reverse or during sudden throttle application.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.104.412 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 18.4 kg (40.6 lbs) |
| Overall Diameter | 280 mm |
| Overall Length | 195 mm |
| Number of Pinion Gears | 4 |
| Bearing Type | Tapered roller bearings (pre-loaded) |
| OEM Reference | ZF 4657.104.412 |
Compatibility
This differential is primarily designed for the ZF WG 210 series transmission, but it also fits the WG 190 series due to shared housing architecture. It is compatible with the following ZF transmission models: WG 180, WG 190, WG 200, and WG 210. When replacing this unit, always inspect the 4657201171: HOUSING REAR PART and the 4657298103: HOUSING REAR SECTION for cracks or wear, as these components form the structural envelope for the differential assembly. The part is not backward-compatible with older ZF 4WG or 5WG series without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101080 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201167 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657201171 | HOUSING REAR PART | Rear housing section supporting output shafts |
| 4657298103 | HOUSING REAR SECTION | Additional rear housing reinforcement |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636100801 | CAP SCREW | Fastener for differential bearing caps |
| 4656301148 | FIXING PLATE | Secures differential in housing |
| 4657301034 | SCREEN SHEET | Oil filter screen for lubrication circuit |
| 4657301035 | SCREEN SHEET | Secondary oil filter screen |
| 0636100803 | CAP SCREW | Fastener for housing cover |
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