Overview
The ZF 4644.036.041 6 WG 201 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the torque converter, clutch packs, and planetary gear sets into a single, ready-to-install package. As the core drivetrain component for the WG 201 series, it manages power delivery from the engine to the driveline under extreme loads. The SKU 4644.036.041 identifies this specific variant, which features a 6-speed forward configuration optimized for loader and grader operations. It replaces the need for individual component sourcing, ensuring correct gear ratios and hydraulic pressure calibration from the first start.
Symptoms of Failure
When the ZF 4644.036.041 assembly begins to degrade, operators will notice distinct performance drops. Recognizing these signs early prevents secondary damage to the torque converter or final drive.
- Erratic shifting under load: The transmission hunts between gears or slams into gear when the machine is under heavy drawbar pull. This indicates worn clutch pack steels or degraded piston seals within the assembly.
- Oil leaks at the bell housing or PTO ports: External seepage from the main case gasket or output shaft seal points to bearing wear or case distortion. Left unchecked, this leads to low oil pressure and gear slipping.
- Delayed engagement from Neutral to Forward: A hesitation of 3-5 seconds before the machine moves forward signals a failing hydraulic control valve or a worn charge pump inside the unit.
- High operating temperature with no load: If the transmission runs above 120°C (248°F) during light operation, internal friction from worn bushings or a failing torque converter stator is likely.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4644.036.041 |
| Assembly Type | Complete Powershift Unit (6 WG 201) |
| Number of Speeds | 6 Forward / 3 Reverse |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 480 mm |
| Housing Material | High-tensile cast iron |
| OEM Reference | ZF 4644.036.041 |
| Torque Converter Type | Single-stage, dual-phase |
Compatibility
This complete assembly is engineered for the ZF WG 201 series of powershift transmissions. It is a direct fit for machines originally equipped with the 6 WG 201 model. Based on the part number structure and physical dimensions, the 4644.036.041 unit is also compatible with the following ZF transmission families when using the correct adapter plate and input shaft:
- WG 180 Series – Certain late-model variants with the 6-speed configuration.
- WG 200 Series – Direct interchange for the 6 WG 200 units using the same bell housing pattern.
- WG 211 Series – Limited compatibility with specific torque converter models; verify input spline count.
- WG 150 Series – Not directly compatible without major modifications; intended for lighter-duty cycles.
Note: Always cross-reference the machine manufacturer’s OEM part number before installation. This assembly is designed for ZF-spec hydraulic fluids (ZF TE-ML 03 or 07).
