Overview
The ZF 0636.100.628 HEXAGON SCREW is a critical fastening component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures the differential housing assembly, ensuring precise clamping force to maintain gear alignment and torque transfer integrity. The SKU 0636.100.628 is specifically designed to withstand high shear loads and vibration within the transmission casing, preventing axial movement of adjacent components. When installed alongside the 2093109029: DIFFERENTIAL, this hexagon screw locks the assembly in place, directly influencing the longevity of the drivetrain.
Symptoms of Failure
- Transmission oil seepage at housing joints — A loose or fatigued hexagon screw allows the differential cover to shift, breaking the seal and causing slow oil leaks around the WG100 bell housing.
- Intermittent gear slipping under load — When the 0636.100.628 loses torque retention, the 0750117075: TAPER ROLLER BEARING can shift out of its race, leading to momentary power loss during acceleration.
- Metallic grinding noise from the differential area — A stripped hexagon screw permits the 2093209094: DIFFERENTIAL to vibrate against the housing, creating audible wear patterns.
- Increased backlash in the driveline — Worn fasteners cause the 2093309078: DIFF.HOUSING to flex, resulting in delayed engagement when shifting between forward and reverse gears.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.100.628 |
| Head Type | Hexagon (ISO 4017) |
| Thread Size | M12 x 1.75 |
| Length | 45 mm |
| Material | Alloy Steel 10.9 (Zinc-plated) |
| Weight | 0.045 kg |
| OEM Reference | ZF 0636.100.628 |
| Torque Spec | 85 Nm + 90° angle |
Compatibility
This hexagon screw is validated for ZF WG-series transmissions including the WG100, WG130, and WG131 models. It also fits select WG180 and WG200 variants where the differential housing uses M12 threaded bores. Always verify thread pitch and length against your specific transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109029 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation |
| 2093209094 | DIFFERENTIAL | Secondary gear set for speed reduction |
| 2093309078 | DIFF.HOUSING | Encloses differential gears |
| 0631100223 | SPRING PIN | Locks gear alignment |
| 0730300820 | THRUST WASHER | Reduces axial friction |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheels |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheel hubs |
| 5838300811 | THRUST WASHER | Controls gear end-play |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Spider gear for differential action |
Frequently Asked Questions
Q: Can I reuse the 0636.100.628 hexagon screw after removal?
A: No. ZF specifies this as a torque-to-yield fastener. Reusing it risks thread stripping and differential misalignment. Always install a new OEM screw with fresh thread locker.
Q: Does this screw fit the WG180 transmission?
A: Yes, but only if your WG180 uses the M12 x 1.75 thread pattern. Check the housing bore depth—some early WG180 units require a 50 mm screw length instead of 45 mm.
Q: What tools are needed for installation?
A: A calibrated torque wrench with a 18 mm socket and a protractor for the 90° angle tightening stage. Never use impact guns as they can overstress the hex head.
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Phone: +86 158 2286 3467 |
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