Overview
The ZF 4644.036.001 6 WG 201 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty off-highway machinery. This core component serves as the primary power transfer module, integrating a torque converter, multi-disc clutches, and planetary gear sets within a single housing. As a direct replacement for the WG 201 series, this assembly eliminates the need for partial rebuilds by providing a drop-in solution for machines experiencing total driveline failure. The SKU 4644.036.001 specifically identifies the 6-speed configuration with a standard output flange, ensuring compatibility with original OEM mounting points.
Symptoms of Failure
When the ZF 4644.036.001 assembly begins to degrade, operators will notice distinct operational issues. Below are the most common failure indicators:
- Erratic gear engagement under load: The transmission hesitates or slams into gear when shifting from forward to reverse, often accompanied by a loud clunk. This indicates worn clutch packs or hydraulic valve body degradation.
- Torque converter stall or shudder: A persistent vibration during acceleration at low RPM, combined with the engine revving without proportional vehicle movement, points to internal seal failure or torque converter lock-up clutch wear.
- External hydraulic fluid seepage at bell housing: Oil pooling around the bell housing-to-engine interface or at the output shaft seal suggests damaged O-rings or cracked housing castings, leading to pressure loss and eventual overheating.
- Delayed forward/reverse response: A 3-5 second delay after shifting before the machine moves, often accompanied by a whining noise from the pump section, signals worn charge pump gears or clogged suction strainers.
Technical Specifications
| Parameter | Value |
|---|---|
| Overall Length (Bell to Output) | 785 mm (30.9 in) |
| Dry Weight | 295 kg (650 lbs) |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Disc Material | Sintered bronze on steel core |
| Input Torque Capacity | 1,200 Nm (885 lb-ft) |
| Gear Ratios (1st–6th) | 5.60 / 3.40 / 2.20 / 1.50 / 1.00 / 0.75 |
| OEM Reference | ZF 1320 301 001 |
| Fluid Capacity | 18.5 liters (4.9 gal) ZF EcoFluid M |
Compatibility
This complete unit is engineered for the ZF WG 201 series powershift transmission family. It directly replaces assemblies in the following models:
- WG 180 – 5-speed variant (requires adapter plate for 6-speed conversion)
- WG 200 – 6-speed standard duty (direct bolt-on)
- WG 201 – 6-speed heavy-duty (native fit, no modifications)
- WG 211 – 6-speed with integrated retarder (output flange differs; verify spline count)
Common applications include Case IH Steiger tractors, John Deere 8000 series, and AGCO Challenger MT800 series. Always cross-reference the original transmission tag to confirm the 4644.036.001 matches your machine’s bell housing pattern and PTO configuration.
