Overview
The ZF 4644.036.060 6 WG 201 Powershift Transmission Assembly represents a complete, drop-in replacement unit engineered for heavy-duty off-highway applications. As a fully assembled powershift transmission, this SKU 4644.036.060 integrates the main gear train, clutch packs, and hydraulic control system into a single robust housing. It sits as the core driveline component, transferring engine torque through six forward speeds and one reverse speed, enabling precise shuttle shifting under load. This complete unit eliminates the need for piecemeal rebuilding, offering a direct exchange for worn assemblies in wheel loaders, telehandlers, and industrial tractors. The assembly is designed to interface directly with the TRANSMISSION HOUSING and the TRANSMISSION HOUSING variants, ensuring a secure fit within the drivetrain envelope.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or hydraulic seals degrade, operators experience a pronounced lag or jarring shift when moving from forward to reverse, indicating internal pressure loss.
- Torque converter shudder under load: A vibration or shudder during acceleration, especially in lower gears, suggests wear in the stator or turbine components within the assembly.
- External fluid seepage from bell housing: Leaks originating near the front or rear of the unit often point to compromised seals, such as the SEALING RING, leading to low oil levels and eventual overheating.
- Intermittent loss of drive in specific gears: A failure to engage third or fourth gear under load typically signals a worn clutch piston or a damaged THREADED BUSH within the valve body circuit.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4644.036.060 |
| Assembly Type | 6 WG 201 Powershift Transmission (Complete Unit) |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| Input Torque Capacity | 650 Nm (max) |
| Fluid Capacity | 22 liters (ZF TE-ML 03/05 spec) |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This complete unit is specifically engineered for the ZF WG 201 series, which includes the WG180, WG200, and WG201 variants commonly found in 6- to 10-ton wheel loaders and telescopic handlers. It is a direct replacement for earlier WG180 models with a 6-speed configuration and is backward-compatible with certain WG200 installations when paired with the correct SCREW PLUG kit for hydraulic port sealing. The assembly also fits select models from OEMs such as Liebherr, JCB, and Manitou that utilize the ZF 6 WG 201 drivetrain architecture. Always verify the bell housing pattern and output flange configuration against your existing unit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101172 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4644301390 | TRANSMISSION HOUSING | Alternate housing variant for specific bell housing patterns |
| 4644301189 | THREADED BUSH | Wear-resistant bushing for hydraulic valve body actuation |
| 0636302005 | SCREW PLUG | Seals hydraulic ports during assembly or transport |
| 0634306198 | O-RING | Provides static seal between housing and cover plates |
| 0634801098 | SEALING RING | Prevents oil leakage at rotating shaft interfaces |
| 0730365067 | TYPE PLATE | Identification plate with serial number and specs |
| 0631311009 | GROOVED STUD | Locating pin for precise alignment of housing halves |
| 4644301161 | COVER PLATE | Encloses the clutch pack access port on the housing |
| 0636100621 | HEXAGON SCREW | Fastener for securing cover plates and flanges |
