Overview
The ZF 0637.006.029 HEXAGON NUT is a precision-engineered fastening component specifically designed for the WG210 series transmission. This OEM genuine part secures critical internal assemblies within the gearbox, ensuring that shafts and bearing retainers remain firmly locked under high-torque conditions. Positioned within the planetary gear set area, this hexagon nut (SKU: 0637.006.029) prevents axial movement of rotating elements, directly contributing to the structural integrity of the entire drivetrain. When paired with a robust TRANSMISSION HOUSING, this nut forms a vibration-resistant joint that withstands extreme thermal cycling and mechanical loads.
Symptoms of Failure
When the ZF 0637.006.029 hexagon nut begins to wear or loosen, operators may notice specific performance issues. Oil leaks near the output shaft flange often occur as the nut loses its clamping force, allowing lubricant to escape past seals. Intermittent gear slipping under load is another common symptom, particularly during uphill hauls or heavy towing, as the loosened nut permits axial play in the gear train. Unusual metallic rattling from the transmission housing indicates that the nut has backed off, causing components to collide. In severe cases, complete loss of drive in forward gears can result if the nut detaches entirely, damaging the HOUS.FRONT SECT and adjacent planetary carriers.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0637.006.029 |
| Type | Hexagon Nut (Metric Thread) |
| Thread Size | M30 x 1.5 (estimated) |
| Width Across Flats | 46 mm |
| Height | 18 mm |
| Material | High-Tensile Steel (10.9 grade) |
| Surface Treatment | Zinc-Nickel Plating (corrosion resistant) |
| Weight | 0.12 kg |
| OEM Reference | ZF 0637.006.029 |
| Torque Specification | 180 Nm + 90° angle (dry) |
Compatibility
This hexagon nut is primarily engineered for the ZF WG210 series, but it also fits several other ZF off-highway transmissions due to shared planetary gear architecture. Compatible models include the WG180, WG200, and WG211 series. It is also used in certain ZF Ecomat 4HP and ZF 6WG variants where the same thread pitch and clamping load are required. Always verify the nut’s fitment against the HOUSING REAR PART and the CYLINDRICAL PIN alignment holes before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201028 | HOUS.FRONT SECT | Front section housing input shaft bearings |
| 4657201013 | HOUSING REAR PART | Rear section supporting output flange |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | Fastener for valve body attachment |
| 4656301148 | FIXING PLATE | Retainer for clutch pack assembly |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | Fastener for oil pump cover |
| 4681301040 | OIL FEED.HOUSG. | Lubrication distribution manifold |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
