Overview
The ZF 0631.611.062 SET SCREW is a precision-engineered OEM genuine fastener designed for the valve body and actuator assemblies within ZF WG100, WG130, and WG131 transmissions. This set screw functions as a critical adjustment and retention component, securing internal hydraulic passages and ensuring precise control of clutch pack engagement pressures. The SKU 0631.611.062 is manufactured to ZF’s exacting tolerances, preventing unwanted movement of internal sleeves and pistons during high-torque shifts. It sits adjacent to the 2094101011: TRANSMISSION HOUSING, where it locks down pressure-regulating elements that govern shift timing.
Symptoms of Failure
- Erratic or delayed gear engagement: When the set screw loosens or strips, the valve body loses calibration, causing harsh or delayed shifts between forward gears.
- Internal hydraulic fluid bypass: A worn 0631.611.062 allows pressurized ATF to leak past the bore, leading to low line pressure and eventual clutch slippage under load.
- Audible rattling from the transmission pan: A loose set screw can vibrate against the 2094301045: HOUSING, producing a metallic noise that worsens during acceleration.
- Intermittent loss of reverse gear: Failure of this fastener disrupts the hydraulic circuit to the reverse clutch pack, causing intermittent or complete loss of reverse operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0631.611.062 |
| Type | Hexagon Set Screw (DIN 913) |
| Thread Size | M8 x 1.25 |
| Length | 16 mm |
| Material | Case-hardened alloy steel, zinc-plated |
| Weight | 8.5 g |
| OEM Reference | ZF 0631.611.062 |
| Torque Spec | 12 Nm + 90° |
Compatibility
This genuine ZF set screw is engineered for the WG series of heavy-duty automatic transmissions. It is a direct fit for the WG100, WG130, and WG131 models. It also applies to the WG180 and WG200 variants when used in the valve body retaining bore. The screw interfaces with the 0635460022: BALL check valve and the 2094301044: COVER plate to seal the hydraulic circuit. Always verify thread pitch against your specific transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101011 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 2094301045 | HOUSING | Valve body enclosure |
| 0635460022 | BALL | Check valve for hydraulic circuits |
| 2094301044 | COVER | Sealing plate for valve body access |
| 0750111371 | SHAFT SEAL | Prevents fluid leakage at output shaft |
| 0634303085 | O-RING | Hydraulic seal for piston bores |
| 2094301030 | GASKET | Oil pan sealing gasket |
| 0631306670 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636011356 | HEXAGON SCREW | General fastening bolt for covers |
| 4475280060 | SCREW PLUG | Threaded plug for oil passages |
