Overview
The ZF 0636.100.613 HEXAGON SCREW is a precision-engineered OEM genuine fastener designed to secure critical assemblies within the WG100, WG130, and WG131 transmission series. This hexagon screw plays a vital role in clamping the 4108101140 HOUSING to the main gear train, ensuring that torque loads are evenly distributed and that no axial play develops over time. As part of the Springs & Fasteners category, the SKU 0636.100.613 is manufactured to exact ZF tolerances, preventing loosening under high-vibration conditions. When installed correctly, this screw maintains the structural integrity of the transmission’s oil circuit and gear alignment, directly influencing shift quality and overall drivetrain reliability.
Symptoms of Failure
- Oil seepage around the housing joint: A worn or stripped 0636.100.613 hexagon screw can cause the 0501314793 COVER to lose clamping force, leading to gradual transmission fluid leaks that worsen under load.
- Intermittent gear slippage during acceleration: When this fastener fatigues, the 0501211694 MOTOR assembly may shift slightly, causing delayed engagement or slipping in higher gears.
- Unusual metallic rattling from the bell housing: A loose hexagon screw allows the 0501314799 BUSH to vibrate against adjacent components, producing a distinct rattle that intensifies at low RPM.
- Increased end-play in the output shaft: Failure of this fastener can lead to progressive wear on the 0735370299 TAPERED ROLLER BEARING, resulting in measurable axial movement and reduced bearing life.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.100.613 |
| Type | Hexagon Screw (OEM Genuine) |
| Thread Size | M10 x 1.5 |
| Length | 35 mm |
| Head Diameter | 16 mm |
| Material | Alloy Steel, 10.9 Grade |
| Surface Finish | Zinc-Nickel Plated |
| Weight | 0.04 kg |
| OEM Reference | ZF 0636.100.613 |
Compatibility
This hexagon screw is specifically engineered for the ZF WG100, WG130, and WG131 series transmissions. It is also compatible with the WG180 and WG200 models when used in conjunction with the 0501317874 HOUSING and 0501317875 ROLLER assemblies. For applications requiring the 0501209497 PISTON or 0501317876 COMPRESSION SPRING, verify thread engagement depth to ensure proper clamping. The 0636.100.613 screw also fits select ZF off-highway and marine gearboxes where M10 fasteners are specified for cover retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101140 | HOUSING | Encloses the gear train and supports bearing bores |
| 0501211694 | MOTOR | Hydraulic actuation for clutch packs |
| 0501314793 | COVER | Seals the motor cavity and retains fluid |
| 0501314799 | BUSH | Guides the shift rod and reduces friction |
| 0735370299 | TAPERED ROLLER BEARING | Supports axial and radial loads on shafts |
| 0501317874 | HOUSING | Secondary housing for auxiliary drives |
| 0501317875 | ROLLER | Reduces rotational friction in planetary sets |
| 0501209497 | PISTON | Applies hydraulic pressure to clutches |
| 0501317876 | COMPRESSION SPRING | Returns piston to neutral position |
| 0501314823 | BUSH | Wear-resistant liner for pivot points |
