Overview
The ZF 0636.101.390 CAP SCREW is a critical OEM genuine fastener engineered for the WG100, WG130, and WG131 transmission series. This cap screw secures internal housing components, ensuring precise alignment of the planetary gearset and clutch packs. Positioned within the main casing, it prevents axial movement of the 4699100080: BASIC GEARBOX assembly. The SKU 0636.101.390 is manufactured to ZF’s exacting torque and tensile strength standards, making it a direct replacement for worn or stripped fasteners in heavy-duty industrial transmissions.
Symptoms of Failure
- Transmission oil seepage at bolt heads: A loose or corroded cap screw compromises the sealing interface, allowing fluid to weep past the 0634309122: SHAFT SEAL.
- Gear engagement hesitation or slipping: When the cap screw fatigues, internal clearances shift, causing delayed clutch pack engagement under load.
- Metallic rattling from the bell housing: A fractured cap screw permits the 0634801038: SEALING RING to shift, producing audible vibration during gear changes.
- Torque converter misalignment: Worn threads in the cap screw hole lead to uneven pressure on the 0630000091: SHIM RING, causing driveline shudder.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.101.390 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hexagon socket (Allen) |
| Material | Alloy steel, 10.9 grade |
| Surface Finish | Zinc-plated, yellow passivated |
| Weight | 0.035 kg |
| OEM Reference | ZF 0636.101.390 |
Compatibility
This cap screw is specifically validated for ZF WG100, WG130, and WG131 transmissions. It also fits select variants of the WG180 and WG200 series when used in conjunction with the 0630000255: SHIM RING for proper axial clearance. Always verify thread pitch against your housing bore; the 0630000058: SHIM RING and 0630000059: SHIM RING are commonly paired during reassembly. For heavy-duty applications, the 0750117782: TAPERED ROLLER BEARING must be torqued to spec before installing this cap screw.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699100080 | BASIC GEARBOX | Complete transmission housing assembly |
| 0634309122 | SHAFT SEAL | Prevents fluid leakage at output shaft |
| 0634801038 | SEALING RING | Static seal for cover plates |
| 0630000091 | SHIM RING | Adjusts bearing preload |
| 0630000255 | SHIM RING | Fine clearance adjustment |
| 0630000058 | SHIM RING | Thickness 0.5 mm |
| 0630000059 | SHIM RING | Thickness 0.8 mm |
| 0630000061 | SHIM RING | Thickness 1.0 mm |
| 0501341241 | WHEEL STUD | Wheel mounting fastener |
| 0750117782 | TAPERED ROLLER BEARING | Supports planetary gear rotation |
