Overview
The ZF 4644.036.002 6 WG 201 Powershift Transmission Assembly is a complete, fully assembled unit engineered for heavy-duty off-highway applications. This core component integrates the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As a direct replacement for the WG 201 series, it manages power distribution from the engine to the driveline, enabling seamless gear shifts under load without interrupting torque flow. The SKU 4644.036.002 identifies this specific assembly variant, which includes updated clutch packs and sealing rings for enhanced durability in construction and mining equipment.
Symptoms of Failure
When the ZF 4644.036.002 assembly begins to degrade, operators typically notice these distinct warning signs:
- Erratic gear engagement or clutch chatter – Worn friction discs cause hesitation or violent engagement when shifting from neutral to forward or reverse.
- Internal hydraulic pressure loss – Degraded seals or valve body wear lead to sluggish shifting or complete loss of drive in specific gears.
- Torque converter shudder at low RPM – A vibrating sensation during acceleration indicates worn stator bearings or damaged turbine splines.
- Visible oil leaks from bell housing or output flange – Deteriorated input shaft seals or case gaskets allow transmission fluid to escape, often accompanied by burnt odor.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.036.002 |
| Assembly Type | Complete Powershift Unit (6 WG 201) |
| Dry Weight | ~385 kg (849 lbs) |
| Overall Length | 1,020 mm (40.2 in) |
| Overall Width | 610 mm (24.0 in) |
| Overall Height | 580 mm (22.8 in) |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Disc Material | Sintered bronze on steel core |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
| OEM Reference | ZF 1320 301 001 |
Compatibility
This complete assembly is specifically designed for the ZF WG 201 transmission series. It is a direct fit for the following ZF models and their sub-variants:
- ZF WG 180 – Early production models with 6-speed forward configuration.
- ZF WG 200 – Standard-duty units used in wheel loaders and telehandlers.
- ZF WG 201 – Heavy-duty variant with reinforced planetary carriers.
- ZF WG 211 – High-torque derivative for articulated dump trucks.
Always verify the serial number on your existing transmission tag before installation. This assembly replaces earlier part numbers 4644.035.001 and 4644.034.003 with upgraded clutch piston seals.
