Overview
The ZF 0636.010.402 HEXAGON SCREW is a critical fastening component engineered specifically for the WG92 and WG98 transmission series. This OEM genuine part secures the 4660101023: TRANSMISSION HOUSING and the 4660301058: HOUSING assembly, ensuring precise alignment and structural integrity under high-torque conditions. The SKU 0636.010.402 is manufactured to ZF’s exacting tolerances, providing a leak-proof seal and vibration resistance in heavy-duty industrial transmissions. Without this hexagon screw, the housing assembly cannot maintain its load-bearing capacity, leading to potential misalignment of internal gears and shafts.
Symptoms of Failure
- Transmission oil leaks around the housing joint: When the hexagon screw loses its clamping force, oil seeps past the gasket, creating visible drips under the vehicle or equipment. This is a common long-tail search query for “ZF WG92 oil leak fix.”
- Abnormal gear slipping or delayed engagement: A loose or stripped hexagon screw allows the housing to shift slightly, causing misalignment of the gear train. Operators may notice “WG98 transmission slipping under load” as a frequent complaint.
- Increased vibration and noise from the transmission casing: As the screw loosens, the housing components rattle against each other, producing a distinct metallic clatter. This symptom often triggers searches for “ZF transmission housing vibration causes.”
- Difficulty in removing or re-torquing the screw: Corrosion or thread galling on the hexagon screw makes maintenance challenging, leading to “stripped hex screw in ZF transmission” queries.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.010.402 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Head Size | 18 mm hex (estimated) |
| Material | High-strength alloy steel, zinc-plated |
| Weight | 0.08 kg (approx.) |
| OEM Reference | ZF 0636.010.402 |
| Torque Specification | 80 Nm (recommended) |
Compatibility
This hexagon screw is a direct replacement for ZF WG92 and WG98 series transmissions, including models such as WG180, WG200, and WG211. It is also used in the WG92 and WG98 transfer case assemblies. The part interfaces directly with the 0631306174: CYLINDRICAL PIN for precise alignment and the 0750100022: SCREW PLUG for sealing access ports. Always verify your transmission model number before ordering to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101023 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4660301058 | HOUSING | Secondary housing for clutch pack |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0750100022 | SCREW PLUG | Seals oil passages and inspection ports |
| 4660301009 | BRACKET | Mounting support for transmission |
| 4660221039 | TUBE | Oil supply conduit |
| 0636103274 | CAP SCREW | Fastener for cover plates |
| 0634306185 | O-RING | Seal for hydraulic connections |
| 4660221041 | TUBE | Coolant return line |
| 4660221040 | TUBE | Pressure feed line |
