Overview
This complete ZF 4644.036.208 6 WG 201 Powershift Transmission Assembly is a fully integrated drop-in unit designed for heavy-duty off-highway machinery. As the core hydraulic-mechanical drivetrain component, it manages torque distribution across six forward speeds and one reverse gear, enabling seamless power shifting under load. The SKU 4644.036.208 represents the latest revision of the WG 201 series, incorporating reinforced clutch packs and a hardened output shaft to withstand sustained high-torque applications in wheel loaders, telehandlers, and industrial tractors. This assembly replaces the need for individual sub-component repairs, providing a factory-balanced solution that restores original equipment performance.
Symptoms of Failure
When the ZF 4644.036.208 unit begins to degrade, operators typically notice these specific failure indicators:
- Delayed engagement or gear hunting — The transmission hesitates before shifting into forward or reverse, often accompanied by a momentary loss of tractive effort during directional changes.
- Hydraulic oil contamination with metallic debris — Fine metal particles appear in the transmission fluid filter or sump magnet, indicating internal clutch plate or bearing wear within the 6 WG 201 assembly.
- Erratic power delivery under load — The machine surges or loses torque when climbing grades or pushing material, suggesting worn piston seals or valve body degradation in the SKU 4644.036.208.
- External fluid seepage at the PTO housing — Oil leaks develop around the power take-off cover or shift cylinder gaskets, progressively reducing hydraulic pressure and causing slipping.
Technical Specifications
| Parameter | Value |
|---|---|
| Assembly Weight | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 410 mm |
| Overall Height | 480 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| Input Torque Capacity | 1,200 Nm (885 lb-ft) |
| OEM Reference | ZF 4644.036.208 |
| Fluid Capacity | 14.5 liters (ZF EcoFluid M-1) |
Compatibility
This complete unit is engineered for the WG 201 Series powershift family. It is directly compatible with the following ZF transmission models and their derivatives:
- ZF WG 180 — Early-generation 5-speed units upgraded to 6-speed via the 4644.036.208 clutch drum configuration.
- ZF WG 200 — Standard 6-speed models used in 12-18 ton wheel loaders; the SKU 4644.036.208 serves as a direct replacement for earlier WG 200 assemblies.
- ZF WG 201 — The primary application for this part, including all sub-variants (WG 201-1, WG 201-2) found in telescopic handlers and compact excavators.
- ZF WG 211 — Heavy-duty variants with reinforced planet carriers; the 4644.036.208 assembly is backward-compatible with these housings after minor seal kit updates.
Always verify the bellhousing pattern and torque converter pilot diameter against your existing unit before installation. This assembly does not include the torque converter or electronic control module.
