Overview
The ZF 4644.026.283 6 WG 200 Powershift Transmission Assembly is a complete, factory-grade replacement unit engineered for heavy-duty off-highway applications. This assembly serves as the primary power transfer module within the WG 200 Series, integrating the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. Designed to handle high torque loads in construction, mining, and agricultural machinery, this unit ensures seamless gear shifts under full power. The SKU 4644.026.283 denotes a fully assembled transmission with all internal components pre-installed, eliminating the need for partial rebuilds. It sits directly between the engine flywheel and the final drive, converting rotational energy into controlled forward and reverse motion.
Symptoms of Failure
When the ZF 4644.026.283 begins to degrade, operators will notice distinct performance issues. Recognizing these early can prevent catastrophic drivetrain damage:
- Erratic clutch engagement under load – The transmission may hesitate or slam into gear when shifting between forward and reverse, indicating worn clutch packs or hydraulic pressure loss.
- Oil leaks from the bell housing or output shaft seal – Visible fluid drips or puddling under the machine suggest degraded seals or housing cracks, leading to low fluid levels and overheating.
- Gear slipping during uphill operation – A sudden loss of torque while climbing slopes points to worn planetary gears or a failing torque converter stator.
- Delayed or no response in high range – If the transmission fails to engage 5th or 6th gear, the shift valve body or solenoid pack may be contaminated with debris.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4644.026.283 |
| Series | WG 200 (6-speed powershift) |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 1320.301.002 (superseded) |
| Fluid Capacity | 28 liters (ZF EcoFluid M-2) |
Compatibility
This complete assembly is specifically designed for the ZF WG 200 Series powershift transmissions. Based on its mechanical architecture and spline configuration, it is directly compatible with the following models and their derivatives:
- ZF WG 200 – All 6-speed variants (standard and heavy-duty)
- ZF WG 180 – When used with an adapter housing for lower torque applications (verify bell housing pattern)
- ZF WG 210 – Limited compatibility; requires confirmation of output flange bolt pattern
- ZF Ergopower 200 – Some cross-compatibility with earlier hydraulic control versions
Note: Always cross-reference the vehicle’s original transmission tag or consult a ZF parts catalog to confirm fitment for specific OEM models (e.g., Liebherr, Volvo CE, or John Deere).
