Overview
The ZF 4644.102.071 INPUT for WG200 is a critical driveline component engineered to transfer rotational force from the torque converter directly into the planetary gear sets of the ZF WG200 series transmission. As the primary power intake point, this OEM genuine part ensures seamless engagement and torque distribution under heavy-duty industrial loads. The SKU 4644.102.071 is precision-machined to factory tolerances, guaranteeing a direct fit within the main gear housing assembly. This input shaft interfaces directly with the TRANSMISSION HOUSING (4644101102) to maintain concentric alignment and prevent parasitic power loss during high-stress operations.
Symptoms of Failure
- Delayed or harsh engagement: When the 4644.102.071 input shaft wears, operators often report a noticeable lag or clunk when shifting from neutral to drive, indicating spline wear or bearing surface degradation.
- Low-frequency vibration at cruising speed: A worn input shaft can cause rhythmic shaking through the chassis, particularly under load, as the shaft loses its true rotational axis within the TRANSMISSION HOUSING (4644301195).
- Transmission fluid contamination: Metal particles in the oil pan are a direct indicator of input shaft spalling or pitting, often accompanied by a burnt smell from friction material breakdown.
- Intermittent gear slippage: As the input shaft’s pilot bearing seat erodes, the torque converter may lose hydraulic lockup, causing the transmission to slip out of gear under moderate acceleration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.102.071 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm (12.28 in) |
| Spline Major Diameter | 42 mm (1.65 in) |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4644.102.071 (Genuine) |
| Surface Treatment | Black oxide with phosphate coating |
| Bearing Journal Hardness | 58-62 HRC |
Compatibility
This genuine ZF input shaft is specifically designed for the WG 200 Series transmissions, including the WG180, WG200, and WG210 variants used in mobile cranes, forklifts, and industrial material handlers. It is also backward-compatible with select early WG150 models when paired with the correct TYPE PLATE (0730365067) for identification verification. The 4644.102.071 replaces superseded part numbers 4644.102.069 and 4644.102.070. For proper installation, ensure the GROOVED STUD (0631311009) is torqued to 85 Nm to secure the shaft within the housing assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101102 | TRANSMISSION HOUSING | Encloses gear sets and supports input shaft alignment |
| 4644301195 | TRANSMISSION HOUSING | Alternate housing variant for WG200 series |
| 0730365067 | TYPE PLATE | Identifies transmission model and revision level |
| 0631311009 | GROOVED STUD | Secures input shaft to torque converter hub |
| 4644303060 | COVER PLATE | Seals front access opening to input shaft area |
| 4644303061 | COVER PLATE | Alternate cover plate with breather port |
| 0634801250 | SEALING RING | Prevents oil leakage at input shaft bore |
| 0636305026 | SCREW PLUG | Closes pressure test port on housing |
| 0636305019 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0634801165 | SEALING RING | Copper gasket for high-temperature sealing |
