Overview
The ZF 4644.033.036 3 WG 201 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready replacement for heavy-duty off-highway applications. This complete unit integrates the main drive housing, clutch packs, and hydraulic control system into a single, pre-tested assembly. As the core power transfer module in the WG 201 series, it manages torque distribution across multiple gear ranges. The SKU 4644.033.036 designates a factory-spec complete unit, ensuring direct interchangeability with original equipment. When installing this assembly, always verify the integrity of the TRANSMISSION HOUSING and the TRANSMISSION HOUSING to guarantee proper sealing and alignment.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn internal clutches or seals cause a noticeable lag when shifting from neutral to forward or reverse, often accompanied by a jarring engagement.
- Torque converter shudder under load: A vibration or shudder felt through the driveline during acceleration indicates internal wear within the powershift assembly.
- Hydraulic fluid contamination: Metallic particles or dark, burnt-smelling oil in the transmission pan signal internal component degradation, often traced back to the clutch packs within this unit.
- Intermittent loss of drive: The transmission may suddenly lose power to the wheels, especially after extended operation, due to failing seals or a compromised THREADED BUSH.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.033.036 |
| Assembly Type | Complete Powershift Unit (3 WG 201) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| Seal Material | Nitrile rubber (NBR) / Viton |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
| OEM Reference | ZF 3 WG 201 Series |
Compatibility
This complete unit is engineered for the ZF WG 201 series of powershift transmissions. It is directly compatible with the following ZF models and their variants: WG 180, WG 200, WG 201, and WG 211. These transmissions are commonly found in telescopic handlers, wheel loaders, and industrial forklifts from manufacturers such as Manitou, JCB, and Linde. For proper sealing during installation, use a new SCREW PLUG on all hydraulic ports to prevent contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4644301323 | TRANSMISSION HOUSING | Secondary housing for clutch pack enclosure |
| 4644301189 | THREADED BUSH | Wear-resistant insert for shift linkage pivot points |
| 4475280043 | SCREW PLUG | Seals hydraulic test ports and drain holes |
| 0634306198 | O-RING | Provides static seal between housing flanges |
| 0730365067 | TYPE PLATE | Identification plate with serial number and specs |
| 4644301161 | COVER PLATE | Access cover for valve body inspection |
| 0636100621 | HEXAGON SCREW | Fastener for housing and cover plate mounting |
| 0631610020 | SET SCREW | Locks adjustment sleeves and shift forks |
| 0501218540 | BREATHER | Vents internal pressure and prevents moisture ingress |
