Overview
The ZF 4644.302.162 INPUT SHAFT is a critical torque-transmitting component engineered specifically for the WG200 series powershift transmission. This OEM genuine part serves as the primary interface between the engine’s output and the transmission’s gear train, transferring rotational force through the clutch pack assembly. Precision-machined from high-strength alloy steel, the SKU 4644.302.162 ensures minimal backlash and optimal alignment within the main housing. It sits directly behind the torque converter, engaging with the TRANSMISSION HOUSING (4644101234) and the TRANSMISSION HOUSING (4644301282) to maintain concentricity under heavy loads. Without this shaft, the WG200 cannot achieve forward or reverse motion, making it a non-negotiable element for drivetrain integrity.
Symptoms of Failure
- Persistent oil leaks at the input seal area – Worn splines or a scored shaft surface compromise the lip seal, allowing transmission fluid to weep onto the bell housing. This is a common long-tail search query for “ZF WG200 input shaft oil leak repair.”
- Gear slipping under moderate acceleration – As the shaft’s splines wear, the clutch hub loses positive engagement, causing intermittent power loss. Operators often search for “WG200 transmission slipping when shifting.”
- Abnormal vibration or chatter during idle – A bent or unbalanced input shaft induces rhythmic noise that resonates through the ADAPTER (4475280078) and the main case. This symptom is frequently reported as “ZF transmission vibrating at low RPM.”
- Metal debris in the transmission pan – Flaking from the shaft’s hardened surface contaminates the oil, accelerating wear on the VALVE BLOCK (4644306560) and clutch packs.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4644.302.162 |
| Overall Length | 385 mm (estimated) |
| Spline Major Diameter | 42 mm |
| Spline Count | 21 (input side) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4644.302.162 (genuine) |
| Surface Finish | Ground & polished, 0.8 µm Ra |
Compatibility
This input shaft is designed for the ZF WG200 series powershift transmission, commonly used in heavy-duty construction and agricultural machinery. It is also compatible with the closely related WG180 and WG210 models, provided the housing and adapter configurations match. The shaft interfaces directly with the SHIFT SYSTEM (4644106300) and the SHIFT SYSTEM (4644159300) for precise gear selection. Always verify the TYPE PLATE (0730365067) on your transmission to confirm model variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101234 | TRANSMISSION HOUSING | Encloses gear train and supports input shaft bearing |
| 4644301282 | TRANSMISSION HOUSING | Rear housing section for output shaft alignment |
| 4475280078 | ADAPTER | Connects transmission to engine bell housing |
| 0730365067 | TYPE PLATE | Identification tag with model and serial number |
| 0631311009 | GROOVED STUD | Secures housing alignment dowels |
| 4644106300 | SHIFT SYSTEM | Hydraulic shift fork assembly |
| 4644306500 | COVER PLATE | Seals access port for shift mechanism |
| 4644159300 | SHIFT SYSTEM | Secondary shift rail assembly |
| 4644306560 | VALVE BLOCK | Controls hydraulic pressure to clutches |
| 4644306408 | WASHER | Thrust washer for input shaft axial play |
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