Overview
The ZF 0636.023.124 HEXAGON SCREW is a critical OEM genuine fastener engineered for the WG100, WG130, and WG131 transmission series. This hexagon-head bolt secures internal housing assemblies, ensuring precise clamping force within the gear train. As a structural component, it prevents relative movement between mated surfaces under high torque and thermal cycling. The SKU 0636.023.124 is specifically designed to withstand the vibration and shear loads present in heavy-duty ZF transmissions, making it an essential part for maintaining drivetrain integrity.
Symptoms of Failure
- Transmission oil seepage at housing joints: When the 0636.023.124 hexagon screw loses preload, the seal between the HOUSING (4699101155) and the main casing can break, leading to slow oil weeping.
- Abnormal gear rattle or clunking during shift: A loose or fatigued hexagon screw allows micro-movement of the HOUSING (4699201018), causing misalignment that produces metallic noise under load.
- Reduced hydraulic pressure in the valve body: A failed fastener can distort the HOUSING COVER (4699309077), creating internal leaks that drop line pressure and delay gear engagement.
- Vibration felt through the chassis at highway speeds: Worn threads or a stripped hex head on the 0636.023.124 can unbalance the rotating assembly, transmitting resonance into the vehicle frame.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0636.023.124 |
| Head Type | Hexagon (Hex Head) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Material | High-tensile steel, zinc-plated |
| Weight | ~0.045 kg (45 g) |
| OEM Reference | ZF 0636.023.124 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is factory-specified for ZF WG100, WG130, and WG131 transmissions. It also applies to derivative models such as the WG180 and WG200 where the same housing bolt pattern is used. The 0636.023.124 is commonly replaced alongside the TORX SCREW (0636100132) during a full housing reseal. Always verify thread pitch and length against your specific transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101155 | HOUSING | Main transmission casing section |
| 4699201018 | HOUSING | Intermediate housing for gear cluster |
| 4699309077 | HOUSING COVER | Seals the rear of the transmission |
| 0636100132 | TORX SCREW | Internal fastener for valve body |
| 0631302072 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0634801038 | SEALING RING | Prevents oil leaks at joints |
| 0636302013 | SCREW PLUG | Closes oil passages |
| 0501319149 | SCREW PLUG | Drain or fill port plug |
| 0637101790 | BREATHER | Equalizes internal pressure |
| 0631302221 | CYLINDRICAL PIN | Precision alignment pin |
