Overview
The ZF 0636.100.634 HEXAGON SCREW is a critical OEM genuine fastener engineered for the differential and axle assemblies of ZF WG100, WG130, and WG131 transmissions. This hexagon screw secures key drivetrain components within the transmission housing, ensuring precise alignment and clamping force under high torque loads. As a genuine ZF part, SKU 0636.100.634 meets exacting OEM tolerances to prevent loosening from vibration and thermal cycling. It is commonly installed alongside the 5838109012: DIFFERENTIAL and the 5838300626: DIFFERENTIAL HOUSING to maintain structural integrity in heavy-duty industrial applications.
Symptoms of Failure
- Transmission oil seepage around the differential housing: A worn or stripped hexagon screw can compromise the seal between the DIFFERENTIAL HOUSING and the transmission case, leading to visible fluid leaks.
- Abnormal gear whine or clunking during load shifts: Loose fasteners allow the DIFFERENTIAL assembly to shift slightly, causing misalignment and audible gear noise under acceleration or deceleration.
- Increased backlash in the drivetrain: When the hexagon screw loses clamping force, the 0750117075: TAPER ROLLER BEARING may experience uneven preload, resulting in noticeable play between rotating components.
- Vibration at highway speeds: A failing fastener can cause the 2093209023: DIFFERENTIAL to wobble, transmitting vibration through the transmission housing and into the vehicle chassis.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.100.634 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Head Style | Hexagon, Flanged |
| Material | High-Tensile Steel, Zinc-Plated |
| Weight | Approx. 0.04 kg |
| OEM Reference | ZF 0636.100.634 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is specifically designed for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with certain variants of the WG180 and WG200 transmissions where the differential housing uses identical bolt patterns. Always verify thread pitch and length against your existing fastener before installation. The screw works in conjunction with the DIFFERENTIAL HOUSING and the TAPER ROLLER BEARING to ensure proper assembly of the differential unit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation under load |
| 2093209023 | DIFFERENTIAL | Alternative differential assembly variant |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and supports differential gears |
| 0631329088 | SPRING PIN | Secures gear alignment in differential |
| 5838300811 | THRUST WASHER | Reduces axial friction in gear sets |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Controls side gear axial play |
| 5838300818 | THRUST WASHER | Prevents wear on differential pinion gears |
Frequently Asked Questions
Q: Can I reuse the ZF 0636.100.634 hexagon screw after removal?
A: ZF recommends replacing this fastener with a new OEM screw whenever it is removed, as the thread-locking coating and tensile properties degrade after initial torque application.
Q: What torque specification should I use for this screw?
A: For the 0636.100.634 hexagon screw, the typical tightening torque is 45–50 Nm when installed with clean, dry threads. Always consult your transmission service manual for exact values.
Q: Does this screw fit the WG180 transmission?
A: Yes, the 0636.100.634 is compatible with WG180 models that share the same differential housing bolt pattern as the WG100/WG130 series. Verify by comparing thread size and length to your existing bolt.
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