Overview
The ZF 0636.011.437 HEXAGON SCREW is a critical fastening element engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures internal assemblies within the gearbox housing, ensuring precise alignment of planetary gear sets and differential components. The hexagon head design allows for accurate torque application during installation, preventing loosening under high-vibration conditions. As part of the Springs & Fasteners category, this screw (SKU: 0636.011.437) directly interfaces with the 5838109021: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING to maintain axial stability in the drivetrain.
Symptoms of Failure
- Transmission oil seepage at housing joints: A loose or fatigued hexagon screw compromises the sealing surface, allowing ATF to weep from the bell housing or side cover.
- Intermittent gear slipping under load: When the screw fails to hold the 2095209019: DIFFERENTIAL in position, gear engagement becomes erratic, especially during uphill climbs or towing.
- Metallic rattling from the transmission pan: A broken screw can drop into the sump, causing debris contamination and audible clattering during shifts.
- Hard shifting between 2nd and 3rd gear: Misalignment from a stripped screw affects the shift fork rail, producing delayed or harsh gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.011.437 |
| Type | Hexagon Screw (Socket Head Cap) |
| Thread Size | M10 x 1.5 mm |
| Length | 35 mm |
| Head Diameter | 16 mm |
| Material | Alloy Steel, 10.9 Grade |
| Surface Treatment | Zinc-Nickel Plated |
| Weight | 0.032 kg |
| OEM Reference | ZF 0636.011.437 |
| Torque Spec | 45 Nm + 90° |
Compatibility
This hexagon screw is validated for the following ZF transmission models: WG100, WG130, WG131, WG180, WG200, and WG210. It is also used in select off-highway variants of the WG series. When replacing this fastener, always inspect the mating 0631329086: SPRING PIN for wear, as both components share the same load path in the clutch pack assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838300817 | THRUST WASHER | Reduces axial friction in planetary gears |
| 5838300682 | DIFFERENTIAL AXLE | Transfers torque to wheel hubs |
| 5838300811 | THRUST WASHER | Spacer for differential side gears |
| 5841302064 | THRUST WASHER | Load distribution in clutch drum |
| 5838300812 | SEALING RING | Prevents fluid bypass at shaft |
| 5838300137 | OUTER CLUTCH DISK | Friction surface for gear engagement |
