Overview
The ZF 0636.102.041 CAP SCREW is a precision-engineered fastener specifically designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures critical internal assemblies within the gearbox housing, ensuring that pressure plates, valve bodies, and bearing retainers remain firmly clamped under high-torque conditions. The SKU 0636.102.041 is manufactured to ZF’s exacting metallurgical standards, providing the tensile strength required to withstand the constant vibration and thermal cycling found in heavy-duty industrial transmissions. When installed correctly, this cap screw prevents relative movement between mating components, which is essential for maintaining proper gear mesh and hydraulic pressure integrity.
Symptoms of Failure
- Transmission oil seepage from bolt holes: A loose or fatigued cap screw can compromise the sealing surface, allowing ATF to weep past the 0634309122: SHAFT SEAL and accumulate around the bell housing.
- Intermittent gear engagement or slipping: When the cap screw loses its clamping force, internal shift forks and clutch packs may shift out of alignment, causing delayed or harsh engagement under load.
- Metallic rattling or knocking from the transmission sump: A fractured cap screw can break free and circulate within the gearbox, potentially damaging the 4699100080: BASIC GEARBOX housing and planetary gear sets.
- Increased end-play in output shafts: Failure to secure bearing retainers with this cap screw leads to axial movement, which accelerates wear on the 0634801038: SEALING RING and adjacent thrust washers.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0636.102.041 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hexagon socket (Allen key drive) |
| Material | Alloy steel, zinc-plated |
| Tensile Strength | 10.9 grade (ISO 898-1) |
| Weight | 0.025 kg |
| OEM Reference | ZF 0636.102.041 |
Compatibility
This cap screw is a direct replacement for the following ZF transmission models: WG100, WG130, and WG131. It is also commonly used in the WG180 and WG200 series for securing the valve body cover and rear bearing retainer. Always verify thread pitch and length against your specific transmission variant. When reinstalling, we recommend pairing this fastener with a new 0630000091: SHIM RING to achieve the correct preload on the bearing stack.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699100080 | BASIC GEARBOX | Complete transmission housing assembly |
| 0634309122 | SHAFT SEAL | Prevents fluid leakage at rotating shafts |
| 0634801038 | SEALING RING | Static seal for hydraulic circuit ports |
| 0630000091 | SHIM RING | Adjusts axial clearance in planetary gear sets |
| 0630000255 | SHIM RING | Thickness variant for fine-tuned end-play |
| 0630000058 | SHIM RING | 0.5 mm shim for bearing preload |
| 0630000059 | SHIM RING | 0.8 mm shim for clearance adjustment |
| 0630000061 | SHIM RING | 1.0 mm shim for final assembly tolerance |
| 0501341241 | WHEEL STUD | Secures wheel hub to transmission flange |
| 0750117782 | TAPERED ROLLER BEARING | Supports radial and axial loads on main shaft |
