Overview
The ZF 0636.104.257 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 components remain precisely aligned under high torque and thermal stress. As a key element in the Springs & Fasteners category, the SKU 0636.104.257 provides the clamping force necessary to maintain hydraulic pressure integrity within the gear train. When installed alongside the 4699101108: HOUSING, this cap screw prevents axial movement that could compromise shift quality.
Symptoms of Failure
- Transmission fluid seepage around the housing joint — A loose or fatigued cap screw allows the 0634306309: O-RING to lose compression, leading to external oil leaks that worsen over time.
- Intermittent gear slipping under load — Insufficient fastener torque permits micro-movement of the 0501329881: HOUSING COVER, disrupting clutch pack engagement.
- Abnormal vibration or rattle from the bell housing — A broken cap screw causes the 0630513065: SNAP RING to shift, creating metallic noise during acceleration.
- Difficulty engaging reverse gear — Wear on the cap screw threads reduces preload on the output shaft assembly, delaying hydraulic response.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.104.257 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hexagon socket (Allen) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 22 g (0.78 oz) |
| OEM Reference | ZF 0636.104.257 |
| Torque Specification | 45 Nm ± 3 Nm |
Compatibility
This cap screw is specifically designed for ZF WG100, WG130, and WG131 transmissions. It also fits select variants of the WG180 and WG200 series when used in the housing-to-cover interface. Always verify thread pitch and length against your existing fastener. For complete assembly, pair this part with the 4699102172: INPUT shaft and 4699302299: DRIVE PINION for optimal drivetrain alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101108 | HOUSING | Main structural casing for gear train |
| 0501329881 | HOUSING COVER | Seals and protects internal components |
| 0630513065 | SNAP RING | Retains bearings on shafts |
| 0634306309 | O-RING | Fluid seal between housing sections |
| 0637885612 | BREATHER | Pressure equalization vent |
| 0769100082 | TYPE PLATE | Identification and rating label |
| 4699102172 | INPUT | Power input shaft assembly |
| 4699302299 | DRIVE PINION | Primary gear engagement component |
| 4699103057 | OUTPUT | Power output shaft assembly |
| 4699303195 | WHEEL STUD | Wheel mounting fastener |
