Overview
The ZF 0636.101.173 CAP SCREW is a precision-engineered fastening component designed for critical sealing and structural integrity within ZF WG100, WG180, WG200, and WG201 series transmissions. This OEM genuine part, identified by SKU 0636.101.173, secures the TRANSMISSION HOUSING assembly, ensuring that hydraulic pressure is maintained and that external contaminants are excluded. As a cap screw, it provides a flush, sealed closure at key access points, directly supporting the reliable operation of the DISCONNECTION mechanism and the OUTPUT FLANGE interface. Without this exact fastener, the transmission’s internal lubrication and pressure circuits are compromised.
Symptoms of Failure
- Hydraulic fluid seepage around the housing: A worn or stripped cap screw fails to create a proper seal, leading to slow oil leaks that accumulate on the transmission exterior.
- Loose or rattling components during operation: When the cap screw loses its clamping force, the HEXAGON SCREW and other fasteners may vibrate, causing audible noise and potential misalignment.
- Intermittent gear engagement or slipping: Loss of pressure integrity due to a faulty cap screw can reduce hydraulic actuation force, resulting in delayed or incomplete shifts.
- Visible corrosion or thread galling: Exposure to heat and transmission fluid can degrade the screw’s surface, making removal difficult and compromising future serviceability.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0636.101.173 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 25 mm (estimated) |
| Head Type | Hexagon socket cap |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.03 kg (estimated) |
| OEM Reference | ZF 0636.101.173 |
Compatibility
This cap screw is engineered for direct replacement in the following ZF transmission series: WG 100 Series, WG 180 Series, WG 200 Series, and WG 201 Series. It is commonly used in applications such as construction loaders, agricultural tractors, and industrial material handlers. Always verify that the screw interfaces correctly with the TRANSMISSION HOUSING and the TRANSMISSION HOUSING variant to ensure a leak-free fit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105413 | DISCONNECTION | Controls hydraulic flow for clutch disengagement |
| 4642303093 | OUTPUT FLANGE | Transfers torque from transmission to driveline |
| 0636021010 | HEXAGON SCREW | Secures cover plates and access panels |
| 4644101222 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301226 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 4644301298 | COVER PLATE | Seals the transmission inspection opening |
| 0634306525 | O-RING | Provides static seal between mating surfaces |
| 0636305026 | SCREW PLUG | Closes fluid drain or fill ports |
