Overview
The ZF 4646.102.057 Input Sub-Assembly is a critical OEM component engineered for the WG 250, WG 260, and WG 310 series transmissions. This precision-machined assembly serves as the primary power transfer interface, connecting the engine flywheel to the transmission’s planetary gear set. As a direct OEM replacement, the SKU 4646.102.057 ensures exact fitment and load-bearing integrity, eliminating the guesswork of aftermarket alternatives. It is designed to withstand high torque loads and thermal cycling common in heavy-duty industrial applications.
Symptoms of Failure
- Transmission oil leaks at the bell housing: A worn 4646.102.057 input assembly often causes fluid seepage around the front seal area, leading to low oil levels and potential gear damage.
- Hard shifting or gear slippage under load: When the input shaft bearing surface degrades, you may experience delayed engagement or a slipping sensation during acceleration, particularly in WG 261 and WG 311 series units.
- Unusual whining or grinding noises: Excessive play in the input sub-assembly generates metallic sounds during idle or deceleration, indicating imminent failure of the internal splines or thrust washer.
- Vibration through the driveline: A misaligned or worn input component transmits noticeable shuddering to the chassis, especially at highway speeds, signaling the need for immediate replacement.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.102.057 |
| Material | Case-hardened alloy steel (16MnCr5) |
| Weight | 4.2 kg (9.26 lbs) |
| Overall Length | 215 mm |
| Spline Count | 14-tooth involute (DIN 5480) |
| OEM Reference | ZF 4646.102.057 |
| Torque Capacity | 1,200 Nm (885 lb-ft) |
Compatibility
This input sub-assembly is specifically validated for the ZF WG 180, WG 200, WG 250, WG 260, and WG 310 series transmissions. It is a direct fit for the WG 261 and WG 311 variants, which share the same bell housing pattern and input shaft dimensions. Always verify your transmission model plate before ordering; the 4646.102.057 replaces earlier revision 4646.102.056 without modification.
During installation, it is essential to replace all associated fasteners and seals. Use 0636115293: 螺栓 and 0736300232: 螺栓 to secure the assembly to the torque converter housing. Install a new 0634316523: O-RING on the input shaft to prevent oil bypass, and apply 4475280208: SCREW PLUG to the pressure port after filling.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Mounting bolt for input assembly flange |
| 0736300232 | 螺栓 | High-tensile bolt for bell housing |
| 4475280208 | SCREW PLUG | Seals pressure test port |
| 0634316523 | O-RING | Input shaft static seal |
| 0630361026 | SEALING CAP | Protects unused hydraulic ports |
| 0501214611 | 齿轮泵 | Hydraulic pump for clutch actuation |
| 0634313945 | O形圈 | Seal for pump mounting face |
| 0501322534 | TEMPERATURE SENSOR | Monitors transmission oil temperature |
| 0634313366 | O-RING | Sensor port seal |
| 4646130044 | ENGINE CONNECTION | Flywheel adapter plate |
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