Overview
The ZF 0636.104.036 CAP SCREW is a critical fastening component engineered specifically for the WG150 and WG200 series transmissions. This OEM genuine part secures the hydraulic control module and valve body assembly within the transmission housing, ensuring precise clamping force to prevent fluid bypass and maintain system pressure. As a factory-specified fastener, the SKU 0636.104.036 replaces worn or stripped bolts that compromise the integrity of the transmission’s internal sealing surfaces. It is often installed alongside the 4642101047: TRANSMISSION HOUSING and the 4642301207: TRANSMISSION HOUSING during major rebuilds, as these components share the same mounting interface.
Symptoms of Failure
- External oil seepage around the valve body cover: A worn or stretched cap screw reduces clamping force, allowing transmission fluid to weep past the gasket. This is a common long-tail search query for “ZF WG150 oil leak at valve body bolt.”
- Erratic gear engagement or delayed shifting: When the cap screw loosens, hydraulic pressure drops within the shift system, causing slipping or harsh engagement during acceleration.
- Visible thread galling or bolt head rounding: Repeated thermal cycling can cause the cap screw to seize or strip, making removal difficult and risking damage to the 0631311009: GROOVED STUD that aligns the assembly.
- Increased transmission noise under load: A loose cap screw allows vibration between the housing and valve body, producing a distinct metallic rattle at highway speeds.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 0636.104.036 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hexagon socket (Allen) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.04 kg (0.09 lbs) |
| OEM Reference | ZF 0636.104.036 |
| Torque Specification | 45 Nm (33 ft-lbs) |
Compatibility
This cap screw is directly compatible with ZF WG150 and WG200 series transmissions, including the WG180, WG190, and WG210 variants. It is used in both on-highway and off-highway applications where the transmission housing requires secure fastening of the valve body and filter assembly. For complete rebuilds, verify that the 0730365067: TYPE PLATE matches your transmission model to ensure correct part identification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4642301207 | TRANSMISSION HOUSING | Secondary housing for clutch pack and valve body |
| 0730365067 | TYPE PLATE | Identification tag with model and serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing positioning |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4642301169 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100621 | HEXAGON SCREW | Fastener for oil pan attachment |
| 4642301186 | SCREEN SHEET | Magnetic screen for debris capture |
| 4644106300 | SHIFT SYSTEM | Hydraulic actuator for gear selection |
| 4644306500 | COVER PLATE | Access cover for valve body inspection |
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