Overview
The ZF 4657.102.026 INPUT for WG190 is a precision-engineered input shaft assembly designed to transfer torque from the engine directly into the transmission’s planetary gearset. Positioned at the front of the main housing, this OEM genuine part (SKU: 4657.102.026) serves as the critical rotational interface between the clutch pack and the gear train. Manufactured to ZF’s original specifications, it ensures minimal backlash and consistent power delivery across all operating speeds. The input shaft works in concert with the TRANSMISSION HOUSING to maintain proper alignment, while the HOUS.FRONT SECT provides the bearing support necessary for smooth rotation.
Symptoms of Failure
- Torque converter shudder under load: A worn input shaft spline causes intermittent engagement, leading to vibration during acceleration—often searched as “ZF WG190 input shaft shudder fix.”
- Delayed or harsh forward engagement: When the input shaft bearing surface degrades, hydraulic pressure drops, resulting in a noticeable lag when shifting from neutral to drive.
- Metallic debris in transmission fluid: Flaking or spalling on the input shaft’s hardened surface produces fine metal particles, detectable during routine oil changes.
- Intermittent gear slipping in higher ranges: Loss of rotational integrity between the input shaft and the HOUSING REAR PART can cause momentary power loss in 4th and 5th gears.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.102.026 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm |
| Spline Diameter (input) | 38 mm |
| Weight | 4.2 kg |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
| Surface Finish | Ground & polished (Ra ≤ 0.4 µm) |
| OEM Reference | ZF 4657.102.026 (genuine) |
Compatibility
This input shaft is engineered for ZF’s WG and BP series transmissions. It is a direct fit for the WG 190 Series and WG 210 Series, and also serves the BP 210 Series and BP 230 Series with identical spline geometry. The part is not compatible with WG180 or WG200 models due to differing bearing journal diameters. For proper installation, ensure the HOUSING REAR SECTION is inspected for wear, as misalignment here accelerates input shaft fatigue.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Encases gear train and supports input shaft alignment |
| 4657201166 | HOUS.FRONT SECT | Front housing section with input bearing bore |
| 4657201168 | HOUSING REAR PART | Rear housing section for output shaft support |
| 4657298101 | HOUSING REAR SECTION | Reinforced rear section for heavy-duty applications |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing-to-input shaft positioning |
| 0636100801 | CAP SCREW | M10 fastener securing input shaft bearing retainer |
| 4656301148 | FIXING PLATE | Locks input shaft axial position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for input shaft oil feed |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for main sump return |
| 0636100803 | CAP SCREW | M12 fastener for housing rear section |
Frequently Asked Questions
Q: Can the 4657.102.026 input shaft be used in a WG210 transmission without modification?
A: Yes. The spline count, pilot bearing diameter, and overall length are identical between WG190 and WG210 series. Always verify the HOUS.FRONT SECT condition before installation.
Q: What torque specification is required for the input shaft retaining nut?
A: ZF specifies 280 Nm ± 10 Nm for the main shaft nut. Use a new FIXING PLATE (part 4656301148) to lock the nut after torquing.
Q: How do I differentiate between a worn input shaft and a failing torque converter?
A: If the vibration occurs only during gear engagement and disappears at steady speed, suspect the input shaft. A failing torque converter typically produces continuous shudder at low RPM. Inspect the TRANSMISSION HOUSING for witness marks indicating shaft contact.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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