Overview
The ZF 0636.103.335 HEXAGON SCREW is a critical fastening component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures the housing assembly and internal structural elements, ensuring precise alignment under high torque and vibration. The SKU 0636.103.335 is specifically designed to withstand the demanding loads of industrial drivetrains, preventing loosening during operation. When installed alongside the 2093140001: HOISTING UNIT, this hexagon screw provides the necessary clamping force to maintain gear train stability.
Symptoms of Failure
- Transmission oil seepage at housing joints: A worn or stretched 0636.103.335 screw reduces clamping pressure, allowing lubricant to escape around gasket surfaces. This often appears as slow drips near the bell housing.
- Audible rattling or knocking during gear engagement: When the hexagon screw loses preload, internal components shift, causing metallic contact. Operators may notice this symptom during low-speed maneuvers or load changes.
- Progressive gear slippage under heavy load: Inadequate fastening force from a degraded screw allows the 2093240001: LIFTING SHAFT to misalign, leading to intermittent power loss.
- Vibration through the shift lever: A loose hexagon screw creates micro-movements in the transmission casing, transmitting excess vibration to the operator cabin.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.103.335 |
| Thread Size | M12 x 1.75 |
| Overall Length | 45 mm |
| Head Type | Hexagon (ISO 4017) |
| Material | Alloy Steel, 10.9 Grade |
| Surface Finish | Zinc-Nickel Plated |
| Weight | 0.04 kg |
| OEM Reference | ZF 0636.103.335 |
Compatibility
This hexagon screw is factory-specified for ZF WG100, WG130, and WG131 transmissions. It also fits WG180 and WG200 series when used in secondary fastening positions. The 0636.103.335 is frequently replaced during overhauls involving the 2095340002: BUSH and 2093340007: BRACKET assemblies. Always verify thread pitch against your specific housing before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093140001 | HOISTING UNIT | Lifts and positions transmission assembly |
| 2093240001 | LIFTING SHAFT | Transfers lifting force to housing |
| 2095340002 | BUSH | Reduces friction on pivot points |
| 2093340007 | BRACKET | Supports auxiliary component mounting |
| 0501327177 | PLAIN BEARING | Provides low-friction rotational support |
| 2093340008 | BRACKET | Secondary bracket for sensor mounting |
| 5838300323 | BEARING BUSH | Wear-resistant sleeve for shaft alignment |
| 0636011381 | HEXAGON SCREW | Alternate length fastener for deep housings |
| 0632604006 | LUBRICATING NIPPLE | Grease access point for bushings |
| 5838300240 | SEALING RING | Prevents fluid leakage at threaded joints |
Frequently Asked Questions
Q: Can I reuse the 0636.103.335 hexagon screw after disassembly?
A: ZF recommends replacing this screw with a new OEM unit each time it is removed. The 10.9 grade material undergoes plastic deformation during initial torquing, making reuse risky for maintaining proper clamp load.
Q: What torque specification should I use for installation?
A: For the WG100 series, apply 85 Nm with a 30° angle tightening sequence. Always consult your transmission service manual for exact values, as the 2093340007: BRACKET may require different torque if installed simultaneously.
Q: Does this screw fit the WG180 transmission?
A: Yes, it is compatible with WG180 models when used in the upper housing flange. However, for the lower sump area, verify clearance with the 5838300323: BEARING BUSH to avoid interference.
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