Overview
The ZF 4644.036.062 6 WG 201 Powershift Transmission Assembly is a complete, factory-engineered unit designed for heavy-duty off-highway applications. This assembly integrates the full gear train, clutch packs, and hydraulic control system into a single drop-in replacement package. As the core of the WG 201 series, it manages torque distribution across six forward speeds, ensuring smooth power delivery under extreme loads. The SKU 4644.036.062 is precision-machined to OEM tolerances, eliminating the need for piecemeal component assembly. This unit interfaces directly with the TRANSMISSION HOUSING (4644101172) and the TRANSMISSION HOUSING (4644301390), both of which provide structural integrity and fluid routing channels. Every assembly is tested for hydraulic pressure integrity before shipment.
Symptoms of Failure
- Erratic gear engagement under load: When the main shaft bearings or clutch drum surfaces wear, the transmission hesitates or clunks during shifts, especially in forward gears 3-6.
- Hydraulic oil seepage from bell housing: Worn seal interfaces between the assembly and the THREADED BUSH (4644301189) cause fluid to pool around the PTO area, leading to pressure drops.
- Metallic grinding during neutral-to-drive engagement: Internal gear tooth pitting or spalling generates a distinct high-pitched noise, often accompanied by vibration in the shift lever.
- Delayed reverse engagement: A failing torque converter stator support within the assembly results in a 2-3 second lag when shifting from neutral to reverse.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.036.062 |
| Assembly Type | 6 WG 201 Powershift (Complete Unit) |
| Dry Weight | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | GGG-40 Ductile Cast Iron |
| Max Input Torque | 1,200 Nm |
| Fluid Capacity | 14.5 liters (ZF TE-ML 03) |
| OEM Reference | ZF 6 WG 201 |
Compatibility
This complete unit is engineered for the ZF WG 201 series, but it also retrofits into earlier WG 180 and WG 200 chassis with minor housing modifications. It is directly compatible with the following ZF transmission models: WG 180, WG 200, WG 201, and WG 211. The assembly requires the use of a SCREW PLUG (0636302005) for the drain port and a O-RING (0634306198) for the suction filter housing. For proper sealing, always pair with a SEALING RING (0634801098) on the output flange.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101172 | TRANSMISSION HOUSING | Main structural casing for gear cluster |
| 4644301390 | TRANSMISSION HOUSING | Rear housing section for PTO mount |
| 4644301189 | THREADED BUSH | Oil passage guide for clutch feed |
| 0636302005 | SCREW PLUG | Seals drain and fill ports |
| 0634306198 | O-RING | Hydraulic seal between housings |
| 0634801098 | SEALING RING | Output shaft oil seal |
| 0730365067 | TYPE PLATE | Identification plate for serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing mating |
| 4644301161 | COVER PLATE | Access cover for valve body inspection |
| 0636100621 | HEXAGON SCREW | Fastener for housing attachment |
