Overview
The ZF 4644.036.029 6 WG 201 Powershift Transmission Assembly is a complete, factory-grade replacement unit engineered for heavy-duty off-highway applications. As the core hydraulic-mechanical assembly within the WG 201 Series, this unit integrates the torque converter, planetary gear sets, and clutch packs into a single sealed housing. Designed for direct bolt-in installation, the SKU 4644.036.029 serves as the primary power transfer module, converting engine torque into controlled, multi-speed output for wheel loaders, graders, and industrial tractors. This complete assembly eliminates the need for partial rebuilds, offering a turnkey solution for restoring drivetrain integrity.
Symptoms of Failure
When the ZF 4644.036.029 assembly begins to degrade, operators will notice distinct operational deficits. Recognizing these signs early prevents secondary damage to the torque converter and final drives.
- Delayed engagement or gear slipping under load: Worn clutch packs within the assembly cause hesitation when shifting from neutral to forward or reverse, particularly on inclines.
- External oil leaks at the bell housing or PTO cover: Degraded shaft seals and gaskets allow transmission fluid to weep, leaving visible drips and reducing hydraulic pressure.
- Erratic or harsh shifting patterns: Internal valve body wear or debris contamination leads to abrupt gear changes, often accompanied by a metallic clunk.
- Overheating and burnt fluid odor: Slipping clutches generate excessive friction heat, oxidizing the ATF and producing a distinct burnt smell during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Complete Powershift Transmission Assembly |
| ZF Series | WG 201 |
| SKU / Part Number | 4644.036.029 |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Housing Material | High-tensile cast iron (GGG-40) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| OEM Reference | ZF Friedrichshafen AG (OEM spec) |
| Fluid Capacity | 12.5 liters (ATF Dexron III) |
Compatibility
This complete unit is specifically engineered for the ZF WG 201 Series transmission family. While the 4644.036.029 is a direct fit for the WG 201, it is also mechanically compatible with select variants in the broader ZF powershift lineup. Verify bell housing pattern and PTO configuration before ordering.
- ZF WG 180 Series – Compatible with specific adapter plates for certain loader models.
- ZF WG 200 Series – Direct interchange for WG 200 units with identical clutch count.
- ZF WG 201 Series – Primary application; full bolt-in replacement.
- ZF WG 211 Series – Limited compatibility; requires input shaft modification.
