Overview
The ZF 4644.026.316 WENDEGETRIEBE Powershift Transmission Assembly is a complete, pre-assembled reversing gear unit designed for demanding industrial drivetrains. As a core component within the WG 200 Series, this assembly integrates the forward-reverse clutch pack and planetary gear set to enable seamless directional changes under load. The SKU 4644.026.316 is a direct replacement unit that eliminates the need for individual component rebuilding, reducing downtime in material handling and construction machinery. This assembly mounts directly to the main transmission housing, and when paired with a robust TRANSMISSION HOUSING or a compatible TRANSMISSION HOUSING, it ensures precise alignment of internal shafts and clutches.
Symptoms of Failure
- Delayed or harsh directional shifts: When the WENDEGETRIEBE assembly wears, operators experience a noticeable lag or jarring engagement when switching from forward to reverse, often accompanied by a loud clunk.
- Oil contamination with metallic debris: Internal clutch disc wear generates fine metal particles in the hydraulic fluid, visible during routine oil changes or filter inspections.
- Intermittent loss of drive in one direction: The unit may fail to engage reverse or forward entirely under load, a symptom of worn piston seals or damaged clutch plates within the assembly.
- External fluid seepage at the joint: Leaks develop where the assembly mates to the transmission case, often requiring replacement of the O-RING or sealing components like the SEALING CAP.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4644.026.316 |
| Assembly Type | WENDEGETRIEBE (Reversing Gear) Powershift Complete Unit |
| Series | WG 200 |
| Overall Length (approx.) | 320 mm |
| Overall Width (approx.) | 280 mm |
| Dry Weight (approx.) | 18.5 kg |
| Primary Material | High-strength cast iron housing with steel clutch plates |
| OEM Reference | ZF 4644.026.316 |
| Sealing Interface | Compatible with O-RING and SCREW PLUG |
Compatibility
This complete unit is engineered for the ZF WG 200 Series of powershift transmissions, specifically the WG180, WG200, and WG210 variants. It is also backward-compatible with select WG 160 series models that utilize the same bolt pattern and clutch pack configuration. Always verify the TYPE PLATE on your transmission to confirm exact fitment. The assembly integrates with the GROOVED STUD for secure mounting and requires a COVER PLATE for final sealing of the clutch housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101222 | TRANSMISSION HOUSING | Main structural case for gear and shaft support |
| 4644301226 | TRANSMISSION HOUSING | Alternate housing variant for WG200 series |
| 0730365067 | TYPE PLATE | Identification plate with transmission serial and model |
| 0631311009 | GROOVED STUD | Locating and fastening pin for assembly alignment |
| 4644301298 | COVER PLATE | Seals the clutch pack access opening |
| 0634306525 | O-RING | Hydraulic seal between housing and cover |
| 0636305026 | SCREW PLUG | Seals oil passages and test ports |
| 4475280078 | ADAPTER | Interface component for auxiliary pump mounting |
| 4644301279 | SCREEN SHEET | Fine mesh filter for hydraulic fluid intake |
| 4644301088 | SEALING CAP | Protective cap for unused hydraulic ports |
