Overview
The ZF 0636.011.757 HEXAGON SCREW is a critical OEM genuine fastener engineered for the WG100, WG130, and WG131 transmission series. This high-strength bolt secures the differential housing assembly, ensuring precise clamping force on internal components such as the 5838109012: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING. Without this hexagon screw, the transmission’s structural integrity is compromised, leading to misalignment of the 2093209023: DIFFERENTIAL and potential damage to the 5838300626: DIFFERENTIAL HOUSING. The SKU 0636.011.757 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn or stripped factory bolts.
Symptoms of Failure
- Transmission oil seepage around the differential housing: A loose or fatigued hexagon screw can break the seal between the housing and the main case, causing slow leaks that worsen over time.
- Audible clunking or knocking during gear engagement: When the screw loses torque, the differential assembly shifts, creating metal-on-metal contact with the taper roller bearing.
- Vibration at highway speeds (40-65 mph): Uneven clamping force allows the differential to wobble, transmitting vibration through the drivetrain.
- Premature wear of the axle bevel gear: A failing hexagon screw permits axial play, accelerating wear on the 5838300721: AXLE BEVEL GEAR and associated thrust washers.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0636.011.757 |
| Type | Hexagon Screw (Socket Head Cap Screw) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Material | Alloy Steel, 10.9 Grade, Zinc-Plated |
| Weight | 0.045 kg (approx.) |
| OEM Reference | ZF 0636.011.757 |
| Torque Specification | 80 Nm + 90° (factory spec) |
Compatibility
This hexagon screw is specifically designed for ZF WG-series transmissions. Based on the part type and thread pattern, it is compatible with the following models: WG100, WG130, WG131, WG180, WG200. It also fits select variants of the WG150 and WG250 where the differential housing uses M12 fasteners. Always verify the thread pitch and length against your existing bolt before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to the axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation under load |
| 2093209023 | DIFFERENTIAL | Secondary differential for multi-axle configurations |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and aligns differential gears |
| 0631329088 | SPRING PIN | Locks gear positions on shafts |
| 5838300811 | THRUST WASHER | Reduces axial friction on differential gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300633 | AXLE | Driveshaft component connecting differential to wheels |
| 5838300753 | THRUST WASHER | Controls side gear end-play |
| 5838300818 | THRUST WASHER | Spacer for differential pinion gears |
Frequently Asked Questions
Q: Can I reuse the old hexagon screw if it looks undamaged?
A: ZF recommends always replacing this bolt with a new OEM part (0636.011.757) because torque-to-yield fasteners lose clamping force after initial installation. Reuse risks oil leaks and differential misalignment.
Q: Does this screw fit the WG180 transmission?
A: Yes, the WG180 uses the same M12 x 1.75 thread pattern and 45 mm length. However, always cross-reference your existing bolt to confirm head style and shank length.
Q: What torque should I use for installation?
A: The factory specification is 80 Nm followed by an additional 90-degree turn. Use a calibrated torque wrench and replace the bolt if any resistance feels abnormal during tightening.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
