Overview
The ZF 0636.102.813 HEXAGON SCREW is a critical fastening element engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures internal housing assemblies, ensuring precise clamping force to maintain gear alignment and hydraulic pressure integrity. As a Springs & Fasteners category component, the SKU 0636.102.813 directly interfaces with the main casing and bearing retainers, preventing axial displacement under high-torque conditions. Its hexagonal head design allows for accurate torque application during rebuilds, reducing the risk of thread stripping in aluminum housings.
Symptoms of Failure
- Oil seepage at housing joints: A loose or fatigued hexagon screw compromises the seal between the 4699101123 HOUSING and the main case, leading to visible fluid trails during operation.
- Intermittent gear engagement: When this fastener loses preload, the 4699301208 HOUSING shifts slightly, causing delayed or harsh shifting in WG transmissions.
- Vibration at specific RPM ranges: A worn hexagon screw allows micro-movement of the 4699301017 BEARING COVER, transmitting resonance through the drivetrain.
- Torque converter misalignment: Progressive loosening affects the 4699301085 COVER seating, producing a low-frequency hum during load changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Thread Size | M10 x 1.5 |
| Length | 35 mm |
| Head Type | Hexagon (17 mm wrench) |
| Material | Steel 10.9 grade, zinc-nickel plated |
| Weight | 28 g |
| OEM Reference | 0636.102.813 |
| Torque Spec | 45 Nm + 90° |
Compatibility
This hexagon screw is validated for ZF WG100, WG130, and WG131 transmissions. It also fits WG180 and WG200 models when used in secondary housing positions. Always verify thread pitch compatibility with the 4699301014 THREAD PROTECTIVE SHIELD to avoid cross-threading. For seal integrity, pair with the 0634303141 O-RING and 0734307425 PROTECTION CAP during assembly. The 0501329618 VENT VALVE should be inspected concurrently to prevent pressure buildup that could loosen fasteners.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101123 | HOUSING | Main casing for gear sets |
| 4699301208 | HOUSING | Intermediate support housing |
| 4699301017 | BEARING COVER | Retains output shaft bearing |
| 4699301085 | COVER | Seals valve body access port |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during installation |
| 0634303141 | O-RING | Hydraulic seal for fastener passages |
| 0734307425 | PROTECTION CAP | Dust cover for exposed threads |
| 0501329618 | VENT VALVE | Pressure equalization for housing |
| 0636102023 | CAP SCREW | M8 fastener for auxiliary brackets |
| 0636101008 | CAP SCREW | M6 fastener for sensor mounts |
