Overview
The ZF 0636.101.507 CAP SCREW is a critical OEM genuine fastener engineered for the WG100, WG130, and WG131 transmission series. This precision-threaded component secures internal housing assemblies within the transmission casing, ensuring proper clamping force to maintain hydraulic pressure integrity. As a direct replacement for part number 0636.101.507, this cap screw prevents axial movement of adjacent components like the 4143101043: HOUSING and the 4143301055: HOUSING, which are mounted in close proximity within the valve body section. Without this fastener, the entire gear train alignment can shift, leading to premature wear on the 4143298040: CASE assembly.
Symptoms of Failure
- Transmission oil seepage around the bolt head: When the cap screw loosens or its threads strip, pressurized ATF fluid escapes past the 0634303266: O-RING, leaving visible wet spots on the transmission housing.
- Intermittent gear engagement delay: A failing 0636.101.507 allows the 0631329135: SPRING PIN to shift out of position, causing hesitation when shifting from neutral to drive.
- Audible metallic rattling at low RPM: Loose fasteners create vibration between the 4143301045: SCREEN SHEET and the cap screw head, producing a distinct chatter during idle.
- Increased clutch pack slip: Insufficient clamping force reduces oil pressure to the clutch drums, leading to gradual power loss under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Thread Size | M10 x 1.5 |
| Overall Length | 35 mm |
| Head Type | Hexagon (12-point) |
| Material | Alloy Steel, 10.9 Grade |
| Surface Finish | Zinc-Nickel Plated |
| Weight | 22 g |
| OEM Reference | ZF 0636.101.507 |
| Torque Spec | 45 Nm + 90° |
Compatibility
This cap screw is designed for ZF WG100, WG130, and WG131 transmissions found in medium-duty trucks and construction equipment. It also fits WG180 and WG200 series when used in conjunction with the 0501214034: SEALING CAP and 0636101024: CAP SCREW for multi-point fastening. Always verify thread pitch against your specific 4475280099: SCREW PLUG bore depth before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101043 | HOUSING | Encloses planetary gear set |
| 4143301055 | HOUSING | Supports valve body assembly |
| 4143298040 | CASE | Main transmission casing |
| 0631329135 | SPRING PIN | Locks shift fork position |
| 0501214034 | SEALING CAP | Prevents debris ingress |
| 0636101024 | CAP SCREW | Alternate thread length variant |
| 4475280099 | SCREW PLUG | Seals oil passages |
| 0634303266 | O-RING | Hydraulic seal for fasteners |
| 4143301045 | SCREEN SHEET | Filters transmission fluid |
| 0636420051 | COUNTERSUNK SCREW | Flush-mount fastening |
