Overview
The ZF 0636.011.028 TORNILLO HEXAGONAL is a critical OEM hexagonal bolt designed specifically for the WG260 series transmission assembly. This high-strength fastener secures key drivetrain components within the differential housing, ensuring precise clamping force and structural integrity under extreme torque loads. As an original ZF part, the SKU 0636.011.028 guarantees exact thread pitch and material hardness to prevent loosening during heavy construction machinery operation. It is typically installed on the differential carrier or bearing cap, where it anchors the 2093109001: DIFFERENTIAL assembly and works in concert with the 0750117075: TAPER ROLLER BEARING to maintain proper gear mesh alignment.
Symptoms of Failure
- Transmission housing oil seepage: A loose or fatigued 0636.011.028 bolt can compromise the seal between the differential housing and the 2093309071: DIFF.HOUSING, leading to visible oil leaks around the bolt flange.
- Abnormal gear whine or clunking: When this hexagonal fastener loses its preload, the 2093209095: DIFFERENTIAL may shift slightly, causing irregular tooth contact and audible noise during acceleration or deceleration.
- Vibration under load: A stripped or stretched TORNILLO HEXAGONAL allows micro-movement in the bearing carrier, transmitting vibration through the driveline during heavy excavation work.
- Difficult gear engagement: In severe cases, failure of this bolt can misalign the differential assembly, causing intermittent gear slipping or resistance when shifting between forward and reverse.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.011.028 |
| Type | Hexagonal Bolt (TORNILLO HEXAGONAL) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Head Size | 18 mm hex (estimated) |
| Material | Alloy steel, 10.9 grade, zinc-plated |
| Weight | 0.045 kg (estimated) |
| OEM Reference | ZF 0636.011.028 |
| Application | WG260 transmission differential mount |
Compatibility
This OEM hexagonal bolt is primarily engineered for the ZF WG260 series transmission, commonly found in wheel loaders, graders, and heavy construction machinery. It is also compatible with the following ZF transmission models that share the same differential housing architecture: WG180, WG200, WG240, and WG310. Always verify thread pitch and length against your specific assembly, as the 0636.011.028 is designed for the primary differential carrier bolts and may not fit secondary cover fasteners.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109001 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential carrier rotation |
| 2093209095 | DIFFERENTIAL | Secondary differential unit for dual-axle systems |
| 2093309071 | DIFF.HOUSING | Encloses differential gear set |
| 0631100223 | SPRING PIN | Locks differential shaft in position |
| 0730300820 | THRUST WASHER | Reduces axial friction in differential |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to final drive |
| 5838300811 | THRUST WASHER | Provides axial clearance control |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Engages with axle bevel gear |
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