Overview
The ZF 0636.102.125 CAP SCREW is a critical fastening component engineered specifically for the WG200, WG201, and WG250 series transmissions. This OEM genuine part secures the transmission housing assembly, ensuring precise clamping force to maintain internal gear alignment and hydraulic pressure integrity. The SKU 0636.102.125 is designed to withstand high torque loads and thermal cycling common in industrial drivetrains. When installed alongside the 4644101175 TRANSMISSION HOUSING or the 4644301221 TRANSMISSION HOUSING, this cap screw prevents axial movement of internal components, directly supporting the 0730365067 TYPE PLATE identification system and the 0631311009 GROOVED STUD alignment.
Symptoms of Failure
- Transmission oil seepage around housing joints: A worn or stripped cap screw cannot maintain proper seal compression, leading to gradual fluid loss and potential contamination.
- Audible gear rattle or vibration during load shifts: Loose fasteners allow micro-movement between housing sections, causing misalignment and increased wear on synchronizers.
- Intermittent gear slipping under heavy torque: Insufficient clamping force reduces housing rigidity, allowing internal shafts to shift position and disrupt power flow.
- Difficulty maintaining hydraulic pressure in the valve body: Housing flex from a failed cap screw can distort oil passages, leading to erratic shift timing.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0636.102.125 |
| Thread Size | M12 x 1.75 (estimated) |
| Overall Length | 45 mm (estimated) |
| Head Type | Hexagon socket (estimated) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 0.04 kg (estimated) |
| OEM Reference | ZF 0636.102.125 |
| Torque Specification | 85 Nm (estimated) |
Compatibility
This cap screw is designed for the ZF WG200, WG201, and WG250 series transmissions. It is also compatible with the WG180 series when used in housing bolt patterns. For complete assembly, pair this part with the 4644303060 COVER PLATE or 4644303061 COVER PLATE, and seal the system with the 0634306525 O-RING. Additional related components include the 0636305026 SCREW PLUG, 0501316470 BREATHER, and 4644301279 SCREEN SHEET.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101175 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301221 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment stud for housing positioning |
| 4644303060 | COVER PLATE | Seals access opening on housing |
| 4644303061 | COVER PLATE | Alternate cover plate for different ports |
| 0634306525 | O-RING | Seals fluid passages between components |
| 0636305026 | SCREW PLUG | Closes unused threaded ports |
| 0501316470 | BREATHER | Vents internal pressure buildup |
| 4644301279 | SCREEN SHEET | Filters debris from oil flow |
