Overview
The ZF 0636.115.237 CAP SCREW is a critical OEM genuine fastener engineered for the WG100, WG130, and WG131 transmission series. This cap screw secures the housing assembly, ensuring precise clamping force to maintain internal gear alignment and hydraulic pressure integrity. As a direct replacement for SKU 0636.115.237, it is designed to withstand high torque loads and thermal cycling within the transmission casing. When installed alongside the 4699101049: HOUSING or the 4699301188: HOUSING, this cap screw prevents fluid migration and structural fatigue. It is also frequently paired with the 0636015047: HEXAGON SCREW for multi-point fastening in the valve body section.
Symptoms of Failure
- Transmission fluid seepage around the housing joint: A loose or fatigued cap screw allows oil to escape past the gasket, leading to low fluid levels and erratic shifting.
- Audible clicking or rattling from the bell housing: When the cap screw loses preload, the 4699301128: COVER may vibrate against the casing, creating a distinct metallic noise during acceleration.
- Delayed gear engagement or slipping: Insufficient clamping force from a worn cap screw can misalign internal components, reducing hydraulic pressure and causing clutch pack slippage.
- Increased play in the shift linkage: Over time, a stripped or corroded cap screw compromises the structural rigidity of the mounting points, resulting in vague shifter feel.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.115.237 |
| Thread Size | M10 x 1.5 |
| Length | 35 mm |
| Head Type | Hexagon socket (Allen) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.04 kg (0.09 lbs) |
| OEM Reference | ZF 0636.115.237 |
| Torque Specification | 45 Nm ± 5 Nm |
Compatibility
This cap screw is engineered for the ZF WG100, WG130, and WG131 transmission families. It is also compatible with the WG180 and WG200 series when used in conjunction with the 4699101049: HOUSING or 4699301188: HOUSING. For applications requiring a sealing ring, pair this cap screw with 0734307406: SEALING RING or 0634801038: SEALING RING. Always verify thread pitch and length against your specific transmission model before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101049 | HOUSING | Main transmission casing for WG series |
| 4699301188 | HOUSING | Intermediate housing for gear train support |
| 4699301128 | COVER | Seals the housing access port |
| 0636015047 | HEXAGON SCREW | Fastener for valve body mounting |
| 0734307406 | SEALING RING | Prevents oil leaks at threaded joints |
| 0501319149 | SCREW PLUG | Closes hydraulic test ports |
| 0634801038 | SEALING RING | Copper washer for high-temp sealing |
| 0636101041 | CAP SCREW | M8 alternative for smaller housings |
| 0636101036 | CAP SCREW | M12 variant for heavy-duty flanges |
| 0636101032 | CAP SCREW | Short-length M10 for shallow threads |
