Overview
The ZF 0769.100.557 WASHER is a precision-engineered sealing component designed for the WG100 and WG201 transmission series. This OEM genuine part functions as a critical load-distribution and sealing element between the transmission housing and associated fasteners. Positioned within the main casing assembly, the 0769.100.557 washer prevents fluid migration and maintains structural integrity under high-torque conditions. When paired with a TRANSMISSION HOUSING (4644101160) or a TRANSMISSION HOUSING (4644301323), this washer ensures a leak-proof interface that withstands thermal cycling and vibration.
Symptoms of Failure
- Transmission fluid seepage around bolt heads – A worn 0769.100.557 washer allows oil to escape past the fastener, leaving visible residue on the housing exterior.
- Gear engagement hesitation or slipping – Loss of hydraulic pressure due to washer degradation can cause delayed shifting or clutch pack slippage under load.
- Abnormal housing vibration or loosening – When the washer compresses beyond tolerance, fasteners may back out, leading to audible rattling or misalignment of the THREADED BUSH (4644301189).
- Increased operating temperature – Oil loss from a failed washer reduces lubrication volume, causing the transmission to run hotter than normal.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0769.100.557 |
| Inner Diameter | 14.2 mm (estimated) |
| Outer Diameter | 24.0 mm (estimated) |
| Thickness | 2.5 mm (estimated) |
| Material | Steel with zinc-nickel coating |
| Weight | 8 grams |
| OEM Reference | ZF 0769.100.557 |
| Hardness Rating | HRC 30-35 |
Compatibility
This washer is engineered for the ZF WG100 and WG201 transmission families, including models such as WG180, WG200, WG210, and WG211. It is also suitable for select WG150 variants when used with the correct SCREW PLUG (4475280043). Always verify fitment by cross-referencing your existing part number against the 0769.100.557 specification. For complete housing assemblies, the washer integrates directly with the TRANSMISSION HOUSING (4644101160) and TRANSMISSION HOUSING (4644301323).
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main casing for gear and shaft support |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG201 |
| 4644301189 | THREADED BUSH | Provides threaded interface for fasteners |
| 4475280043 | SCREW PLUG | Seals hydraulic passages |
| 0634306198 | O-RING | Secondary sealing element |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Fastens housing sections together |
| 0631610020 | SET SCREW | Locks adjustment mechanisms |
| 0501218540 | BREATHER | Equalizes internal pressure |
