Overview
This ZF 4644.026.228 6 WG 200(555/3) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty industrial applications. As a core component of the WG 200 series, this assembly integrates the torque converter, clutch packs, and planetary gear sets into a single, ready-to-install package. The SKU 4644.026.228 specifically denotes a 6-speed configuration with a 555/3 ratio set, engineered for precise power distribution under high torque loads. It sits as the primary driveline module in wheel loaders, forklifts, and specialized construction vehicles, converting engine power into controlled, shiftable motion without requiring individual component assembly.
Symptoms of Failure
When the ZF 4644.026.228 assembly begins to degrade, operators will notice distinct performance issues. Delayed or harsh engagement between forward and reverse gears is a primary indicator, often caused by worn clutch discs or degraded seals within the unit. Another common failure symptom is erratic shifting under load, where the transmission hunts for gears or slips during acceleration, pointing to internal hydraulic pressure loss. External oil leaks at the bell housing or output flange are also frequent, typically from fatigued O-rings or cracked housing seals. Finally, abnormal whining or grinding noises during operation suggest bearing wear or planetary gear damage, requiring immediate replacement of the complete assembly to avoid catastrophic driveline failure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4644.026.228 |
| Series | WG 200 (6 WG 200) |
| Configuration | 6-Speed Powershift, 555/3 Ratio |
| Overall Length (approx.) | 685 mm (27.0 in) |
| Dry Weight (approx.) | 295 kg (650 lbs) |
| Housing Material | High-Strength Cast Iron |
| OEM Reference | ZF 4644.026.228 / 6WG200-555/3 |
| Torque Capacity (estimated) | 550 Nm (405 lb-ft) |
Compatibility
This complete assembly is designed for the ZF WG 200 series of powershift transmissions, specifically the 6-speed variant. It is directly compatible with the following ZF transmission models and their derivatives:
- ZF 6 WG 200 (all sub-variants using 555/3 ratio)
- ZF WG 180 (limited compatibility with adapter kits for certain output flanges)
- ZF WG 210 (when used in lower torque applications requiring 6-speed configuration)
- ZF 4 WG 200 (only as a direct upgrade replacement, requiring control module changes)
Always verify the bell housing pattern and output flange spline count against your existing unit. The 4644.026.228 assembly is a drop-in replacement for most 6 WG 200(555/3) installations found in Linde, Manitou, and Terex material handling equipment from the 2000-2015 production era.
