Overview
The ZF 0636.103.279 CAP SCREW is a critical fastening component engineered specifically for the WG 90 and WG 94 series transmissions. This OEM genuine part secures the hydraulic control cover and valve body assemblies within the transmission housing, ensuring proper clamping force to prevent fluid bypass and maintain system pressure. As a precision-machined fastener, the SKU 0636.103.279 is designed to withstand high torque loads and thermal cycling common in heavy-duty industrial applications. It directly interfaces with the 4661101020: TRANSMISSION HOUSING and the 4661301046: HOUSING II, forming a sealed joint that is essential for transmission integrity.
Symptoms of Failure
- Transmission fluid seepage around the valve body cover: A loose or fatigued cap screw allows pressurized ATF to escape, leaving visible wet spots on the housing exterior.
- Erratic shift timing or gear slipping: Insufficient clamping force from a worn 0636.103.279 can cause internal pressure loss, leading to delayed engagement or clutch pack slippage under load.
- Audible rattling or vibration from the transmission case: When this cap screw loses preload, the valve body may shift slightly, creating a metallic chatter during operation.
- Contaminated transmission fluid with metallic debris: A broken or stripped cap screw can shed particles into the oil circuit, accelerating wear on adjacent components like the 0631306174: CYLINDRICAL PIN.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0636.103.279 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hexagon socket (Allen) |
| Material | Alloy steel, zinc-plated |
| Weight | 0.04 kg |
| OEM Reference | ZF 0636.103.279 |
| Torque Specification | 45 Nm (dry) |
Compatibility
This cap screw is primarily used in the ZF WG 90 and WG 94 transmission series, which are commonly found in off-highway vehicles, construction equipment, and agricultural machinery. Based on its application in the valve body retention system, it is also compatible with the WG 180, WG 200, and WG 240 series transmissions that share the same modular housing architecture. Always verify fitment with your specific transmission model, as the 4661301093: TUBE assembly may require different fastener lengths in certain configurations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101020 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assemblies |
| 4661301046 | HOUSING II | Secondary housing for valve body and oil passages |
| 4661301093 | TUBE | Oil delivery conduit between housing sections |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0769123894 | TYPE PLATE | Identification tag with transmission serial number |
| 0750100022 | SCREW PLUG | Sealing plug for pressure test ports |
| 0636302602 | SCREW PLUG | Magnetic drain plug for ferrous debris collection |
| 0634100633 | O-RING | Elastomeric seal for fluid-tight connections |
| 4661301041 | NOZZLE | Lubrication jet for gear mesh cooling |
| 4661301038 | NOZZLE | Secondary oil spray nozzle for clutch pack |
