Overview
The ZF 4651.364.037 WASHER is a precision-engineered sealing component designed for the WG 100 and WG 110 series transmissions. This OEM genuine part functions as a critical load-distributing and sealing element between the transmission housing and fastening hardware. Located within the hydraulic control assembly and clutch pack retention system, the washer prevents fluid bypass and maintains correct clamping force on internal components. The SKU 4651.364.037 is manufactured to ZF’s exacting tolerances, ensuring a perfect fit when replacing worn washers during a transmission overhaul or repair.
Symptoms of Failure
- Transmission fluid seepage at housing joints – A degraded washer allows oil to escape past the mating surfaces, leaving visible wet spots on the exterior of the transmission.
- Intermittent gear slipping under load – When the washer loses its compressive integrity, internal clearances increase, leading to clutch pack slippage during acceleration or hill climbing.
- Abnormal metallic noise from the bell housing – A collapsed or flattened washer can cause metal-to-metal contact between the TRANSMISSION HOUSING (4644101160) and rotating components, producing a distinct grinding sound.
- Erratic shift timing – Loss of hydraulic pressure due to washer failure results in delayed or harsh gear engagement, particularly in the WG 201 series.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4651.364.037 |
| Material | Hardened steel with zinc-nickel plating |
| Inner Diameter | 18.5 mm |
| Outer Diameter | 32.0 mm |
| Thickness | 2.5 mm |
| Weight | 12 grams |
| OEM Reference | ZF 4651.364.037 |
| Surface Hardness | HRC 45-50 |
Compatibility
This washer is directly compatible with the following ZF transmission models: WG 100, WG 110, WG 180, WG 200, and WG 201 series. It is also used in certain variants of the Ecomat 4HP and Ecomat 5HP transmissions where the same clutch pack retention geometry is employed. Always verify the part number against your transmission’s serial plate before installation. For complete housing assembly, pair this washer with the TRANSMISSION HOUSING (4644301323) and the THREADED BUSH (4644301189) to ensure proper alignment. The SCREW PLUG (4475280043) is also commonly replaced during the same service interval to prevent future leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Alternative housing variant for WG 200 |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for fasteners |
| 4475280043 | SCREW PLUG | Seals hydraulic passages in valve body |
| 0634306198 | O-RING | Static seal for housing joints |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 4644301161 | COVER PLATE | Encloses clutch pack access port |
| 0636100621 | HEXAGON SCREW | Fastener for housing cover plate |
| 0631610020 | SET SCREW | Adjustable locking screw for shift linkage |
| 0501218540 | BREATHER | Pressure equalization vent for transmission |
