Overview
The ZF 0636.010.679 HEXAGON SCREW is a critical fastening component engineered specifically for the WG 251 series transmission assembly. This OEM genuine part secures the transmission housing and cover interfaces, ensuring precise clamping force to maintain internal oil pressure and gear alignment. The SKU 0636.010.679 is manufactured to ZF’s exacting tolerances, preventing fastener fatigue under high-torque industrial applications. It is commonly installed alongside the 4646101072: TRANSMISSION HOUSING and 4646301201: HOUSING to create a leak-proof, vibration-resistant joint.
Symptoms of Failure
- Oil seepage at housing seams: When the 0636.010.679 hexagon screw loses torque or corrodes, transmission fluid escapes around the 4646301166: COVER, leading to gradual pressure loss.
- Gear engagement hesitation: A loose or stripped screw causes micro-movement in the housing, delaying clutch pack engagement and producing a soft shift feel.
- Abnormal vibration during load: Worn threads allow the 0636101051: CAP SCREW assembly to loosen, creating harmonic rattle at highway speeds.
- Visible thread galling: Repeated thermal cycling can cause the hexagon screw to seize, making removal difficult and risking housing damage.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.010.679 |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm |
| Head Type | Hexagon (6-point) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.045 kg |
| OEM Reference | ZF 0636.010.679 |
| Torque Spec | 45 Nm (dry) |
Compatibility
This hexagon screw is a direct fit for the ZF WG 251 transmission series. It also cross-references with earlier WG 180 and WG 200 models that share the same housing bolt pattern. The 0636.010.679 is used in conjunction with the 4646201018: COVER SHEET and 4646301277: SCREEN SHEET in oil pan assemblies. For WG 250 and WG 300 variants, verify thread pitch before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4646301201 | HOUSING | Secondary housing for valve body |
| 4646301166 | COVER | Seals the housing end face |
| 0636101051 | CAP SCREW | Fastens cover to housing |
| 4646201018 | COVER SHEET | Gasket layer for oil pan |
| 4646301277 | SCREEN SHEET | Filter mesh for fluid intake |
| 4646201019 | COVER SHEET | Secondary gasket for valve body |
| 0730365125 | TYPE PLATE | Identification label for transmission |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 0636010216 | HEXAGON SCREW | Alternate fastener for cover |
