Overview
The ZF 4646.302.141 INPUT SHAFT is a precision-machined component designed for the WG310 transmission series, as well as the WG 251, WG 261, and WG 311 series. This OEM genuine part transmits engine torque directly from the clutch or torque converter into the gearbox, engaging the planetary gear sets to initiate power flow. As the primary rotational interface, the input shaft must withstand high torsional loads and maintain exact alignment with the pump drive and clutch pack assemblies. The SKU 4646.302.141 is engineered to ZF’s original specifications, ensuring a direct fit without modification. When replacing this shaft, it is critical to also inspect and replace the 0634316523: O-RING to prevent fluid bypass at the shaft seal interface.
Symptoms of Failure
- Transmission oil leaks at the bell housing: A worn input shaft bearing surface or damaged seal groove allows ATF to escape, leaving puddles under the vehicle. This is a common long-tail search query for “ZF WG310 input shaft oil leak.”
- Gear slipping or delayed engagement: Excessive spline wear on the 4646.302.141 shaft causes the clutch hub to lose positive engagement, resulting in hesitation when shifting from Park to Drive or Reverse.
- Vibration during acceleration: A bent or fatigued input shaft creates radial runout, producing a low-frequency shudder that intensifies under load. This symptom often leads technicians to search for “ZF transmission input shaft vibration fix.”
- Metallic debris in the transmission pan: Flaking or spalling on the shaft’s hardened surface introduces ferrous particles into the fluid, which can clog the valve body and damage the 4475280208: SCREW PLUG passages.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4646.302.141 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 285 mm (estimated) |
| Spline Major Diameter | 32 mm (estimated) |
| Weight | 1.8 kg (estimated) |
| OEM Reference | ZF 4646.302.141 |
| Surface Hardness | 58-62 HRC |
Compatibility
This input shaft is a direct replacement for ZF transmission models in the WG family. Verified compatibility includes the WG180, WG200, WG251, WG261, WG310, and WG311 series. It also fits select WG 210 and WG 250 variants where the input spline count and pilot bearing diameter match. Always cross-reference your transmission’s serial number with the 4646.302.141 part number before ordering. During installation, secure the shaft using the 0636115293: 螺栓 and 0736300232: 螺栓 to the specified torque values to prevent loosening under load.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures input shaft bearing retainer |
| 0736300232 | 螺栓 | Fastens clutch housing to transmission case |
| 4475280208 | SCREW PLUG | Seals oil passages in valve body |
| 0634316523 | O-RING | Prevents fluid leaks at shaft seal bore |
| 4656306171 | VALVE BLOCK | Distributes hydraulic pressure to clutch packs |
| 4656306190 | CONNECTING HOUSING | Aligns input shaft with pump drive |
| 0501213997 | PRESSURE REGULATOR | Controls main line pressure to shaft bearings |
| 0736300094 | TORX SCREW | Mounts valve block to transmission case |
| 4475280047 | SCREW-IN SLEEVE | Provides oil feed to input shaft bushing |
| 0634306010 | O形圈 | Seals screw-in sleeve to prevent cross-leaks |
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