Overview
The ZF 0631.607.020 SET SCREW is a precision-engineered fastening component specifically designed for the WG 65 transmission series. This OEM genuine part functions as a critical retention element, securing internal assemblies within the gearbox housing to maintain correct axial alignment and torque transfer. The SKU 0631.607.020 is manufactured to ZF’s exacting tolerances, ensuring a vibration-resistant fit that prevents loosening under heavy-duty operational loads. Typically installed within the valve body or clutch pack retention system, this set screw works in concert with the 4616101100 TRANSMISSION HOUSING to create a sealed, stable environment for rotating components.
Symptoms of Failure
- Oil seepage around the housing joint: A worn or stripped 0631.607.020 set screw can compromise the seal between the transmission housing and cover, leading to gradual fluid loss.
- Intermittent gear slippage under load: When this fastener loses clamping force, internal shift components may shift out of position, causing delayed or erratic engagement.
- Unusual metallic rattling from the transmission: A loose set screw allows adjacent parts to vibrate against each other, producing a distinct high-frequency noise during acceleration.
- Hard shifting or failure to hold gear: Insufficient retention of the valve body or clutch assembly can result in inconsistent hydraulic pressure, leading to harsh or incomplete gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0631.607.020 |
| Type | Set Screw (Hexagon Socket) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 25 mm (estimated) |
| Material | Case-hardened alloy steel, zinc-plated |
| Weight | ~0.02 kg |
| OEM Reference | ZF 0631.607.020 |
| Torque Specification | 45 Nm (factory recommendation) |
Compatibility
This set screw is primarily engineered for the ZF WG 65 series, but its thread pattern and load rating make it suitable for several other ZF off-highway transmissions. Compatible models include the WG 65, WG 180, WG 200, and WG 250 series, where it is used in conjunction with 0636011038 HEXAGON SCREW and 0636011118 HEXAGON SCREW for multi-point fastening of the valve body. For final drive assemblies, it also pairs with 0636016015 HEXAGON SCREW to secure the output flange. Always verify thread pitch and length against your specific transmission model before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101100 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011038 | HEXAGON SCREW | Fastener for cover plate retention |
| 0636011118 | HEXAGON SCREW | Mounting bolt for valve body |
| 0636016015 | HEXAGON SCREW | Output flange securing bolt |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0634313118 | O-RING | Static seal for oil passages |
| 0636304019 | SCREW PLUG | Closes hydraulic test ports |
| 0634801152 | SEALING RING | Copper washer for drain plug |
| 0732611049 | FILTER INSERT | Hydraulic oil filtration element |
| 0634303718 | O-RING | Seal for filter housing cover |
