Overview
The ZF 4644.036.046 6 WG 201 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty off-highway machinery. As a core component of the WG 201 series, this assembly integrates the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. The SKU 4644.036.046 specifically denotes a factory-specification complete unit, eliminating the need for partial rebuilds or component matching. It sits as the direct replacement for the entire driveline assembly in wheel loaders, forklifts, and industrial tractors, providing seamless power transfer from the engine to the drivetrain.
Symptoms of Failure
When the ZF 4644.036.046 assembly begins to degrade, operators will notice distinct operational issues. Recognizing these signs early prevents costly secondary damage:
- Erratic gear engagement or slipping under load: The transmission may hesitate or fail to hold a gear when pushing heavy material, often accompanied by a high-pitched whine from the hydraulic pump.
- External oil seepage from the converter housing: Leaks typically appear around the bell housing gasket or the output shaft seal, leaving visible puddles of ATF under the machine after shutdown.
- Delayed directional shifts (forward to reverse): A noticeable lag of 2-3 seconds when changing direction, indicating worn clutch packs or degraded valve body response within the assembly.
- Overheating with reduced torque output: The transmission temperature gauge climbs rapidly during normal operation, and the machine feels sluggish, suggesting internal seal failure or torque converter stator issues.
Technical Specifications
| Specification | Value |
|---|---|
| Assembly Weight (Dry) | ~185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Input Spline Count | 14-tooth, SAE 3C |
| Output Flange Type | DIN 5480, 8-bolt pattern |
| OEM Reference | ZF 4644.036.046 (Direct) |
| Fluid Capacity (System) | 14.5 liters (ATF Dexron III) |
Compatibility
This complete unit is engineered for the ZF WG 201 transmission series, but its mounting and spline configurations also allow direct fitment into several related models. Verified compatibility includes:
- ZF WG 180 – Late-model variants with SAE 3 bell housing
- ZF WG 200 – Standard production units (pre-2015)
- ZF WG 201 – All sub-variants (6 WG 201, 4 WG 201)
- ZF WG 210 – Limited compatibility; verify output flange bolt pattern
For applications in Case, New Holland, Liebherr, and Volvo wheel loaders, cross-reference the machine serial number against the ZF 4644.036.046 mounting dimensions to ensure a proper fit. This assembly replaces both the 4644.036.044 and 4644.036.045 revisions without modification.
