Overview
The ZF 0731.590.237 THREADED BUSH is a precision-machined component engineered for the WG200 and WG65 series transmissions. This OEM genuine part serves as a critical interface point within the hydraulic control system, providing a secure threaded mounting surface for pressure lines and sensor assemblies. The SKU 0731.590.237 is manufactured to exact ZF tolerances, ensuring proper alignment and sealing within the valve body or housing assembly. When installed correctly, this threaded bush prevents fluid bypass and maintains consistent hydraulic pressure across the transmission’s operating range.
Symptoms of Failure
- Oil seepage around the threaded connection point – A worn 0731.590.237 bush often causes visible transmission fluid leaks at the housing interface, particularly during cold starts or under heavy load.
- Erratic gear engagement or delayed shifting – Degraded threads or surface wear on this bush can disrupt hydraulic pressure signals, leading to harsh or delayed clutch application in WG200 and WG65 units.
- Persistent low fluid pressure warnings – Internal leakage past a damaged threaded bush reduces system pressure, triggering diagnostic trouble codes and potential transmission overheating.
- Vibration or noise from the valve body area – A loose or stripped bush allows movement of attached components, creating audible rattling or buzzing during transmission operation.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0731.590.237 |
| Material | Case-hardened steel (C10E / 1.1121 equivalent) |
| Thread Type | Metric fine pitch (M12 x 1.5 estimated) |
| Overall Length | 28 mm |
| Outer Diameter | 18 mm |
| Weight | 0.035 kg |
| OEM Reference | ZF 0731.590.237 |
| Surface Treatment | Zinc-nickel plating (corrosion resistant) |
Compatibility
This threaded bush is specifically designed for the ZF WG200 and WG65 transmission families, including the WG180, WG200, WG210, WG65, and WG68 variants. It is commonly installed in the TRANSMISSION HOUSING (4616101089) where it secures hydraulic line connections. During installation, the bush is torqued using HEXAGON SCREW (0636011038) and HEXAGON SCREW (0636011118) for the main housing fasteners, while HEXAGON SCREW (0636016015) is used for auxiliary bracket mounting. Always verify the thread pitch and housing depth before replacement.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101089 | TRANSMISSION HOUSING | Main structural casing for gear and valve assemblies |
| 0636011038 | HEXAGON SCREW | Fastener for housing cover attachment |
| 0636011118 | HEXAGON SCREW | Bolt for valve body mounting |
| 0636016015 | HEXAGON SCREW | Flange connection fastener |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0634313118 | O-RING | Static seal for hydraulic ports |
| 0636304019 | SCREW PLUG | Threaded closure for test ports |
| 0634801152 | SEALING RING | Copper washer for high-pressure joints |
| 0732611049 | FILTER INSERT | Hydraulic fluid filtration element |
| 0634303718 | O-RING | Dynamic seal for piston assemblies |
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