Overview
The ZF 4657.102.021 INPUT for WG210 is a critical OEM genuine component engineered to transfer rotational force from the torque converter directly into the planetary gearset of your ZF WG Series transmission. Positioned at the front of the main shaft assembly, this input shaft (SKU: 4657.102.021) absorbs high-torque loads and ensures precise alignment with the TRANSMISSION HOUSING and the HOUS.FRONT SECT. Without this genuine part, the entire driveline loses its mechanical foundation, leading to immediate performance degradation.
Symptoms of Failure
- Delayed or harsh engagement — When the input shaft splines wear, you will notice a pronounced lag when shifting from neutral to drive or reverse, often accompanied by a metallic clunk.
- Transmission fluid leaks at the bell housing — A worn input shaft seal surface allows ATF to escape, leaving puddles under the vehicle and causing low fluid pressure.
- Vibration during acceleration — Excessive play in the 4657.102.021 input shaft creates driveline shudder, especially under heavy load or at highway speeds.
- Gear slipping under torque — As the shaft loses its tight fit with the HOUSING REAR PART, the transmission may intermittently slip out of gear, triggering fault codes.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.102.021 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm (12.28 in) |
| Spline Diameter | 32 mm (1.26 in) – 14-tooth involute |
| Weight | 2.85 kg (6.28 lbs) |
| OEM Reference | ZF 4657.102.021 (Genuine) |
| Hardness | 58–62 HRC (surface) |
Compatibility
This input shaft is specifically designed for the ZF WG 210 Series, but it also fits select models in the WG180, WG200, and WG250 families where the front input geometry matches. Always verify the spline count and overall length against your existing shaft. The 4657.102.021 works in tandem with the CYLINDRICAL PIN that indexes the shaft to the front housing, ensuring zero rotational play during operation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Encloses and supports all internal gear train components |
| 4657201027 | HOUS.FRONT SECT | Front section housing that aligns the input shaft and pump |
| 4657201012 | HOUSING REAR PART | Rear housing section that supports output shaft bearings |
| 0631306792 | CYLINDRICAL PIN | Precision dowel pin for housing-to-shaft alignment |
| 0636100801 | CAP SCREW | M10 bolt securing front housing to main case |
| 4656301148 | FIXING PLATE | Locking plate for input shaft retaining nut |
| 4657301032 | SCREEN SHEET | Fine mesh filter screen for oil pump intake |
| 4657301033 | SCREEN SHEET | Secondary filter screen for valve body return line |
| 0636100803 | CAP SCREW | M12 bolt for rear housing attachment |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil feed tube to input shaft lubrication port |
Frequently Asked Questions
Q: Can I use a used 4657.102.021 input shaft in my WG210 rebuild?
A: We strongly advise against it. The input shaft undergoes case hardening and any prior wear—even microscopic—can accelerate spline failure. Always install a new OEM genuine part to maintain proper clearance with the HOUS.FRONT SECT.
Q: What tools are needed to replace the ZF 4657.102.021?
A: You will need a bearing puller, a torque wrench capable of 180 Nm, and a soft-face mallet. The CYLINDRICAL PIN must be driven out from the front housing side before the shaft can be removed.
Q: How do I confirm this part fits my WG210 transmission?
A: Check the stamped serial number on the TRANSMISSION HOUSING. If the housing code begins with “WG210-“, the 4657.102.021 is the correct input shaft. Measure the spline diameter to be certain.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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