Overview
The ZF 0636.102.056 CAP SCREW is a critical OEM fastening component engineered for the WG100, WG130, and WG131 transmission series. This genuine part secures the 4699101081: HOUSING assembly, ensuring proper clamping force and alignment of internal gear sets. As a precision-machined fastener, the SKU 0636.102.056 prevents axial movement of the 4699102158: INPUT shaft components, maintaining optimal gear mesh geometry under high-torque conditions. Without this cap screw, the transmission’s structural integrity degrades, leading to premature wear of planetary gears and bearings.
Symptoms of Failure
- Transmission oil seepage at housing joints: A loose or stripped 0636.102.056 cap screw compromises the seal between the housing and 0501329881: HOUSING COVER, allowing ATF to weep during operation.
- Audible clunking during gear engagement: Worn threads cause micro-movement of the housing, producing metallic knocking sounds when shifting between forward and reverse.
- Progressive gear slippage under load: Insufficient clamping force allows the input shaft to drift, reducing hydraulic pressure to clutch packs and causing delayed engagement.
- Vibration at highway speeds: A fractured cap screw creates imbalance in the rotating assembly, transmitting harmonic vibrations through the driveline.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.102.056 |
| 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 | 0.032 kg |
| OEM Reference | ZF 0636.102.056 |
Compatibility
This cap screw is designed for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It also applies to derivative units such as the WG180 and WG200 when used in conjunction with the 0634306309: O-RING for sealing. The fastener interfaces directly with the 0637885612: BREATHER port housing on later revisions. Always verify thread pitch against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101081 | HOUSING | Main structural casing for gear train |
| 0501329881 | HOUSING COVER | Seals and protects internal components |
| 0634306309 | O-RING | Fluid seal between housing interfaces |
| 0637885612 | BREATHER | Pressure equalization valve |
| 0501319149 | SCREW PLUG | Oil drain port closure |
| 0636302022 | SCREW PLUG | Secondary port plug |
| 0634801038 | SEALING RING | Crush washer for plug sealing |
| 0730365801 | TYPE PLATE | Identification tag for transmission |
| 4699001182 | GK10 | Gasket kit for overhaul |
| 4699102158 | INPUT | Input shaft assembly |
