Overview
The ZF 4644.331.207 WASHER is a precision-engineered OEM genuine component designed for the WG 180 and WG 200 series transmissions. This hardened steel washer functions as a critical load-spreading interface between fasteners and transmission housing surfaces, ensuring proper torque retention and preventing galling under high-vibration conditions. As a factory-spec part, the SKU 4644.331.207 is manufactured to exact ZF tolerances, making it essential for maintaining the structural integrity of the gear train assembly. When installed alongside the 4460165051 CONSOLE or the 4460368311 CONSOLE, this washer provides the necessary axial clearance for smooth clutch pack engagement.
Symptoms of Failure
- Transmission oil weeping from bolt heads: A worn or crushed 4644.331.207 washer loses its sealing ability, allowing ATF to migrate past the fastener threads—commonly searched as “ZF WG200 oil leak at bolt locations.”
- Gradual torque loss on mounting flanges: When the washer deforms beyond its elastic limit, fasteners like the 0636011429 HEXAGON SCREW can back out, leading to audible rattling or misalignment in the driveline.
- Metallic debris in transmission pan: A fractured washer can shed microscopic steel particles that contaminate the hydraulic circuit, causing intermittent gear slipping or harsh shifts—a symptom often described as “ZF WG180 shifting hesitation.”
- Increased vibration at the bell housing: Loss of clamping force due to washer fatigue allows relative movement between the transmission and engine, generating low-frequency vibration during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.331.207 |
| Material | Carbon steel, zinc-plated (DIN 125A equivalent) |
| Inner Diameter | 14.2 mm |
| Outer Diameter | 30.0 mm |
| Thickness | 3.0 mm |
| Hardness | HRC 38-45 (case-hardened) |
| Weight | 12 grams |
| OEM Reference | ZF 4644.331.207 |
| Thread Compatibility | M14 fasteners (e.g., 0636011429 HEXAGON SCREW) |
Compatibility
This washer is specifically engineered for the ZF WG 180 and WG 200 series transmissions, including all sub-variants such as the WG180-1, WG180-2, WG200-1, and WG200-2. It is also compatible with select ZF Ecolife and AS Tronic models that share the same fastener pattern on the converter housing. For proper installation, always pair the 4644.331.207 with a new 0730100365 WASHER on adjacent fasteners to maintain uniform clamping force across the mating surface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4460165051 | CONSOLE | Provides structural support for shift linkage assembly |
| 4460368311 | CONSOLE | Alternate console variant for WG200 valve body mounting |
| 0636011429 | HEXAGON SCREW | M14 x 1.5 bolt for securing washer and console |
| 0730100365 | WASHER | Flat washer for adjacent fastener positions |
| 4644105418 | DISCONNECTION | Clutch disconnection valve assembly |
| 4644305041 | ADAPTER | Converter housing adapter plate |
| 4460068159 | AXLE DRIVE | Output shaft drive gear |
| 4460168651 | INPUT FLANGE | Input shaft coupling flange |
| 4460368318 | FLANGE | Output flange for driveline connection |
| 4460368317 | DUST PROTECTION | Dust seal for flange cavity |
