Overview
The ZF 4644.026.199 WENDEGETRIEBE Powershift Transmission Assembly is a complete, drop-in unit engineered for heavy-duty industrial drivetrains. As a core component of the WG 200 Series, this assembly integrates the reversing gearbox (WENDEGETRIEBE) with the powershift clutch pack, enabling seamless directional changes under load without requiring the operator to stop the machine. The SKU 4644.026.199 is specifically designed to handle high torque spikes in construction and material handling equipment, replacing worn or failed original assemblies with a factory-matched unit. This complete assembly eliminates the need for piecemeal repairs, ensuring precise gear engagement and hydraulic pressure consistency across all forward and reverse ranges.
Symptoms of Failure
When the ZF 4644.026.199 unit begins to degrade, operators often notice specific operational deficits. Recognizing these signs early can prevent catastrophic driveline damage.
- Delayed or harsh directional shifts: A worn WENDEGETRIEBE assembly often causes a noticeable lag when switching from forward to reverse, or results in a jarring engagement that shakes the chassis.
- Hydraulic oil contamination with metallic debris: Internal clutch pack wear generates fine metal particles in the transmission fluid. If you find silver or bronze glitter on the dipstick or filter, the 4644.026.199 unit is likely shedding friction material.
- Transmission overheating under light load: Slipping clutches inside the powershift assembly generate excessive heat. If the transmission temperature rises rapidly during normal maneuvering, the internal seals or plates may be failing.
- Intermittent loss of drive in one direction: The reversing gearbox may fail to engage reverse or forward intermittently, often accompanied by a whining noise from the gear train, indicating bearing or gear tooth fatigue.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4644.026.199 |
| Assembly Type | Complete WENDEGETRIEBE Powershift Unit |
| Series | WG 200 Series |
| Dry Weight (approx.) | 68 kg (150 lbs) |
| Housing Material | High-tensile cast iron (GGG-40) |
| Input Torque Capacity | 1,200 Nm (885 lb-ft) |
| Overall Length | 485 mm |
| Mounting Bolt Pattern | 6-bolt SAE 3 standard |
| OEM Reference | ZF 4644.026.199 (direct replacement) |
Compatibility
This complete assembly is designed for the ZF WG 200 Series transmission family. It is a direct fit for the following models and their derivatives:
- ZF WG 180 – Used in telehandlers and compact loaders.
- ZF WG 200 – Standard in mid-size wheel loaders and backhoes.
- ZF WG 210 – Found in industrial forklifts and rough-terrain cranes.
- ZF WG 220 – Applied in heavy-duty municipal sweepers and graders.
While the 4644.026.199 is primarily intended for the WG 200 Series, it may also serve as a retrofit for earlier WG 170 units that share the same bellhousing pattern. Always verify the spline count and hydraulic port configuration before installation. For specific vehicle applications (e.g., Liebherr, JCB, or Volvo models), cross-reference the original transmission tag with this SKU to ensure correct gear ratios.
