Overview
The ZF 4644.036.209 6 WG 201 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As a core element of the WG 201 series, it replaces the entire rotating assembly and valve body section within the transmission housing. The SKU 4644.036.209 is the definitive reference for this complete unit, ensuring precise fitment without the need for sub-component matching. When rebuilding a transmission, this assembly is typically mounted inside a TRANSMISSION HOUSING (4644101203) or the alternative TRANSMISSION HOUSING (4644301382), depending on the original equipment configuration.
Symptoms of Failure
When the ZF 4644.036.209 assembly begins to fail, operators will notice distinct performance degradation. Common failure indicators include:
- Erratic gear engagement or slipping under load: The unit may hesitate or fail to hold a gear when the machine is under heavy torque, often accompanied by a burning clutch smell.
- Delayed or harsh shifting: Hydraulic pressure irregularities within the assembly cause a noticeable lag between gear selection and engagement, or a jarring shift.
- Contaminated transmission fluid with metallic debris: Worn clutch plates or bearings shed metal particles into the oil, visible during routine fluid checks or filter changes.
- Whining or grinding noise from the transmission bell housing: Internal bearing wear or gear tooth damage produces a distinct mechanical noise that increases with engine RPM.
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Complete Powershift Transmission Assembly |
| OEM Reference | ZF 4644.036.209 |
| Series | WG 201 |
| Approximate Weight | 185 kg (408 lbs) |
| Housing Material | Cast Iron (GGG-40) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Number of Speeds | 6 Forward / 1 Reverse |
| Associated Fastener | SCREW PLUG (0636302005) |
| Alignment Component | THREADED BUSH (4644301189) |
Compatibility
This complete assembly is engineered for the ZF WG 201 series of powershift transmissions. It is directly compatible with the WG 180, WG 200, and WG 201 models commonly found in telescopic handlers, wheel loaders, and agricultural tractors. The unit also fits select variants of the WG 150 series when used with the correct adapter plate. Always verify the transmission serial number against the SKU 4644.036.209 before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Main structural casing for the assembly |
| 4644301382 | TRANSMISSION HOUSING | Alternative housing variant for WG 201 |
| 4644301189 | THREADED BUSH | Alignment and mounting bushing |
| 0636302005 | SCREW PLUG | Seals hydraulic passages |
| 0634306198 | O-RING | Hydraulic seal between components |
| 0634801098 | SEALING RING | Static seal for housing joints |
| 0730365067 | TYPE PLATE | Identification plate for the assembly |
| 0631311009 | GROOVED STUD | Fastener for cover plate retention |
| 4644301161 | COVER PLATE | Access cover for valve body area |
| 0636100621 | HEXAGON SCREW | Mounting bolt for housing sections |
