Overview
The ZF 4657.102.022 INPUT for WG191/WG211 is a precision-engineered OEM genuine component designed to transfer rotational force from the torque converter directly into the planetary gear sets of ZF’s heavy-duty powershift transmissions. Positioned at the front of the main shaft assembly, this input shaft (SKU: 4657.102.022) absorbs high-torque loads during start-up and gear changes, ensuring smooth power delivery in construction and agricultural machinery. As a critical wear item, it must be replaced with exact OEM specifications to maintain drivetrain integrity. When servicing this shaft, always inspect the TRANSMISSION HOUSING for cracks or warping, as misalignment accelerates input shaft failure.
Symptoms of Failure
- Hard shifting or gear engagement delay: A worn input shaft spline or bearing journal causes hesitation when selecting forward or reverse gears, often accompanied by a metallic clunk.
- Transmission fluid leaks at the bell housing: Deterioration of the input shaft seal surface leads to oil weeping from the front of the transmission, visible as drips near the torque converter.
- Vibration during acceleration: Excessive radial play in the input shaft produces low-frequency shaking that intensifies under load, particularly in WG191 and WG211 series units.
- Intermittent gear slipping under load: Worn splines on the 4657.102.022 shaft fail to lock the clutch packs, causing momentary power loss when climbing grades or pushing heavy loads.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.102.022 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 385 mm |
| Spline Diameter | 42 mm (input end) |
| Weight | 4.2 kg |
| OEM Reference | ZF 4657.102.022 (Genuine) |
| Surface Treatment | Black oxide + phosphate coating |
Compatibility
This input shaft is specifically engineered for ZF WG191 and WG211 series transmissions, commonly found in telehandlers, wheel loaders, and dump trucks. It also fits select WG180 and WG200 variants produced between 2005 and 2020. For proper installation, the HOUS.FRONT SECT must be aligned to within 0.05 mm tolerance, and the HOUSING REAR PART should be inspected for bearing bore wear. Always use a new CYLINDRICAL PIN to secure the shaft during reassembly, as reused pins cause rotational play.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses gear sets and supports input shaft bearings |
| 4657301130 | HOUS.FRONT SECT | Front housing section aligning the input shaft |
| 4657301131 | HOUSING REAR PART | Rear housing section supporting output shaft |
| 0631306816 | CYLINDRICAL PIN | Locating pin for input shaft alignment |
| 0636102489 | CAP SCREW | M10 bolt securing housing sections |
| 4656301148 | FIXING PLATE | Locks input shaft axial position |
| 0636102463 | CAP SCREW | M8 bolt for fixing plate retention |
| 4657201133 | SCREEN SHEET | Oil filter screen protecting shaft lubrication |
| 0636115287 | CAP SCREW | M12 bolt for torque converter attachment |
| 4657301065 | PLATE | Thrust washer for input shaft bearing |
