Overview
The ZF 4646.102.423 INPUT sub-assembly is a precision-engineered component designed for the WG 250, WG 260, and WG 310 series transmissions. This OEM-grade input unit serves as the primary torque-receiving interface between the engine driveline and the transmission’s planetary gearset. Positioned directly behind the bell housing, it ensures smooth power transfer and rotational stability under heavy load conditions. The SKU 4646.102.423 is a direct replacement for the factory-installed assembly, restoring original shift quality and driveline alignment. For a complete rebuild, this input assembly must be paired with a new TRANSMISSION HOUSING to maintain proper bearing preload and sealing integrity.
Symptoms of Failure
- Torque converter shudder or vibration: A worn input assembly causes irregular rotational damping, leading to noticeable shudder during acceleration from a stop.
- Delayed or harsh engagement: When the input shaft splines or bearing surfaces degrade, you may experience a 2-3 second delay when shifting from Neutral to Drive or Reverse.
- Transmission fluid contamination: Metal particles in the oil pan often originate from a failing input bearing, producing a fine silver or bronze sludge visible during fluid changes.
- Whining noise in neutral: A high-pitched whine that disappears when the vehicle moves indicates input bearing wear, a common long-tail search query for WG series diagnostics.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.102.423 |
| OEM Reference | ZF 4646.102.423 |
| Material | Case-hardened steel alloy (20MnCr5 equivalent) |
| Weight | 4.2 kg (9.26 lbs) |
| Input Spline Count | 23 (SAE standard) |
| Bearing Type | Dual-row angular contact (preloaded) |
| Seal Diameter | 62 mm (input shaft seal surface) |
Compatibility
This input sub-assembly is engineered for ZF’s WG series powershift transmissions, specifically the WG 250, WG 260, WG 261, WG 310, and WG 311 models. It also fits select WG 180 and WG 200 variants when used with the appropriate HOUSING adapter. The part is not backward-compatible with older WG 120 series units without modification. For installation, always replace the 螺栓 (bolts) with new OEM fasteners to achieve the correct torque specification of 85 Nm. After assembly, affix the TYPE PLATE to document the rebuild date and part revision.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101162 | TRANSMISSION HOUSING | Main structural casing for gearset and input assembly |
| 4646301334 | HOUSING | Adapter housing for input shaft support |
| 0636115293 | 螺栓 | M12 flange bolt for housing-to-input assembly |
| 0730365125 | TYPE PLATE | Identification plate for serial number tracking |
| 4646201003 | POT | Oil collection pot for lubrication circuit |
| 4646106024 | SHIFT SYSTEM | Hydraulic shift actuator assembly |
| 4646306071 | GASKET | Input housing sealing gasket |
| 4646306072 | ADAPTER PLATE | Mounting plate for shift system |
| 4646306073 | GASKET | Adapter plate sealing gasket |
| 0636102065 | CAP SCREW | M8 cap screw for adapter plate retention |
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