Overview
The ZF 0636.104.191 CAP SCREW is a critical fastening component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures the housing assembly, ensuring that internal pressure and torque loads are properly distributed across the gear train. Positioned within the main casing, the cap screw (SKU: 0636.104.191) works in tandem with the 4699101093: HOUSING and the 4699301175: HOUSING to maintain structural integrity during high-stress operations. Without this fastener, the transmission’s internal alignment can shift, leading to premature wear on adjacent components.
Symptoms of Failure
- Transmission oil seepage around the casing: A loose or stripped cap screw compromises the seal between the housing and the 4699301041: COVER, allowing lubricant to escape.
- Audible rattling or vibration during gear engagement: When the cap screw loses clamping force, the housing components can shift, creating metal-on-metal contact.
- Gradual loss of hydraulic pressure: A failed cap screw may cause the 0634303936: O-RING to deform, reducing system pressure and causing sluggish shifting.
- Visible thread galling or corrosion: Over time, exposure to heat and debris can degrade the cap screw’s threads, leading to incomplete torque retention.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.104.191 |
| Material | Alloy Steel, Zinc-Plated |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 30 mm |
| Head Type | Hex Socket (Allen) |
| Weight | 0.02 kg |
| OEM Reference | ZF 0636.104.191 |
| Torque Spec | 45 Nm (dry) |
Compatibility
This cap screw is specifically designed for ZF WG100, WG130, and WG131 transmissions. It is also compatible with the WG180 and WG200 series when used in conjunction with the 4699101093: HOUSING and 4699301175: HOUSING. For optimal sealing, always pair this fastener with a fresh 0634303936: O-RING. The part does not fit the WG150 series without adapter plates.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101093 | HOUSING | Main casing for gear assembly |
| 4699301175 | HOUSING | Secondary housing for clutch pack |
| 4699301041 | COVER | Seals the housing cavity |
| 0634303936 | O-RING | Hydraulic seal between components |
| 0630513203 | SNAP RING | Retains bearings on shaft |
| 0750110302 | SHAFT SEAL | Prevents oil leakage at output shaft |
| 0630513073 | SNAP RING | Secures planetary gear set |
| 0501319149 | SCREW PLUG | Closes oil drain port |
| 0636302022 | SCREW PLUG | Seals pressure test point |
| 0634801038 | SEALING RING | Copper gasket for plug fittings |
