Overview
The ZF 0637.002.080 HEXAGON NUT is a precision-engineered fastening component specifically designed for the WG92 and WG98 transmission series. This OEM genuine part plays a critical role in securing internal assemblies within the gearbox housing, ensuring that torque loads are evenly distributed across mating surfaces. The SKU 0637.002.080 is often installed during rebuilds or maintenance intervals where the 4950101004: HOUSING or the 4950301018: HOUSING I is being replaced. Without this hexagon nut, the structural integrity of the transmission’s internal mounting points is compromised, leading to misalignment of rotating components.
Symptoms of Failure
When the ZF 0637.002.080 hexagon nut wears out or becomes loose, operators may notice several distinct failure modes. Oil leaks from the transmission housing often occur because the nut’s loosening allows the 0734309932: SHAFT SEAL to shift out of position. Gear slipping under load is another common symptom, as the nut’s failure reduces clamping force on the planetary carrier. Abnormal vibration during shifting can also indicate that this nut has fatigued, causing play in the 4660101023: TRANSMISSION HOUSING assembly. Finally, difficulty engaging forward or reverse gears may point to stripped threads on the hexagon nut, requiring immediate replacement.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0637.002.080 |
| Type | Hexagon Nut |
| Thread Size | M20 x 1.5 (estimated) |
| Width Across Flats | 30 mm |
| Height | 18 mm |
| Material | Case-hardened steel, zinc-plated |
| Weight | 0.08 kg |
| OEM Reference | ZF 0637.002.080 |
| Torque Specification | 120 Nm (dry) |
Compatibility
This hexagon nut is engineered for the ZF WG92 and WG98 series, but it also fits several other ZF transmissions that share the same internal architecture. Compatible models include the WG180, WG200, and WG210 series, as well as the Ecomat 4HP590 and Ecomat 5HP600 when used with the appropriate housing assembly. Always verify the thread pitch against your existing 4660301058: HOUSING or 0631306174: CYLINDRICAL PIN alignment before installation. For applications involving the 0750100022: SCREW PLUG or 4660301009: BRACKET, this nut provides the necessary clamping force to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4950101004 | HOUSING | Encloses planetary gear sets |
| 4950301018 | HOUSING I | Front section of main gearbox casing |
| 0734309932 | SHAFT SEAL | Prevents oil leakage at output shaft |
| 4660101023 | TRANSMISSION HOUSING | Main structural body of transmission |
| 4660301058 | HOUSING | Torque converter housing adapter |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0750100022 | SCREW PLUG | Seals oil passages in housing |
| 4660301009 | BRACKET | Mounting support for shift mechanism |
| 4660221039 | TUBE | Oil supply conduit between housings |
| 0636103274 | CAP SCREW | Fastener for housing attachment |
