Overview
The ZF 4644.026.269 WENDEGETRIEBE Powershift Transmission Assembly is a complete, drop-in replacement unit engineered for the demanding cycles of industrial drivetrains. As a fully assembled “Wendegetriebe” (reversing gearbox) within the WG 200 Series, this component manages directional torque flow, enabling seamless forward-to-reverse shifting without clutching. The SKU 4644.026.269 designates a factory-matched assembly containing the clutch pack, hydraulic valve body, and planetary gear set, ensuring precise power modulation under heavy loads. This unit sits at the core of the transmission housing, directly coupling the torque converter to the output shaft, making it essential for loader, forklift, and agricultural machinery operations.
Symptoms of Failure
When the ZF 4644.026.269 assembly begins to degrade, operators will notice distinct operational disruptions. Identifying these signs early prevents catastrophic driveline damage.
- Delayed or harsh directional shifts: A worn clutch pack or valve body spool causes a noticeable lag (2-3 seconds) when switching from forward to reverse, often accompanied by a jarring engagement. This is a primary indicator of internal hydraulic pressure loss.
- Oil leaks at the bell housing or output flange: Deteriorated shaft seals or a cracked housing on the 4644.026.269 unit will weep ATF fluid, leaving puddles under the machine. This symptom is common after extended thermal cycling.
- Gear slipping under load: If the transmission “loses drive” when climbing a grade or lifting a heavy load, the internal clutches within this assembly are likely glazed or burnt. This manifests as a high-pitched whine followed by a loss of torque.
- Erratic neutral engagement: The machine may creep forward even when the shifter is in neutral, indicating a stuck piston or warped clutch plate inside the Wendegetriebe assembly.
Technical Specifications
| Product SKU | 4644.026.269 |
| Assembly Type | WENDEGETRIEBE (Reversing Gearbox) / Powershift Unit |
| Overall Length | 385 mm (approx.) |
| Flange Diameter | 210 mm (SAE 3 pattern) |
| Dry Weight | 48.5 kg (107 lbs) |
| Housing Material | High-tensile cast iron (GGG-40) |
| Clutch Disc Material | Sintered bronze on steel core |
| Max Input Torque | 650 Nm (479 lb-ft) |
| OEM Reference | ZF 4644.026.269 (Direct replacement) |
Compatibility
This complete unit is specifically engineered for the ZF WG 200 Series transmission family. It is a direct fit for the following models and their derivatives:
- ZF WG 180 (early and late variants)
- ZF WG 200 (standard duty)
- ZF WG 210 (high-torque variants)
- ZF WG 211 (with integrated parking brake)
While primarily designed for the WG 200 Series, the 4644.026.269 assembly may also be retrofitted into select ZF WG 150 housings with adapter plates (verify bell housing bolt pattern). This unit is commonly used in JCB, Manitou, and Linde loaders, as well as Kramer telehandlers. Always cross-reference your existing transmission tag before installation.
