Overview
The ZF 0631.612.064 SET SCREW is a precision-engineered OEM genuine fastener designed for the WG191 and WG211 transmission series. This component plays a critical role in securing internal assemblies within the valve body and hydraulic control unit, ensuring that fluid passages remain properly aligned under high-pressure conditions. The SKU 0631.612.064 is manufactured to exact ZF tolerances, preventing unwanted movement of adjacent components such as the 4657120005: PRESSURE REGULATOR and the 0501211384: VALVE. Without this set screw, the entire hydraulic circuit can lose its structural integrity, leading to performance degradation across the gear train.
Symptoms of Failure
- Transmission fluid seepage at the valve body interface: A worn or loosened set screw allows hydraulic fluid to bypass seals, resulting in visible drips or wet spots on the transmission housing.
- Intermittent gear slippage under load: When the 0631.612.064 fails to hold the 4656306145: PISTON in its correct position, clutch pack engagement becomes erratic, causing hesitation during acceleration.
- Erratic shift timing or harsh engagements: Loss of clamping force from a degraded set screw disrupts the precise movement of the 0630532183: INDENTED RING, leading to delayed or jarring gear changes.
- Increased internal noise from loose components: A missing or stripped set screw allows metal-on-metal contact between the valve body and adjacent parts, producing a distinct rattling sound during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0631.612.064 |
| Material | Case-hardened alloy steel, zinc-plated |
| Thread Size | M8 x 1.25 (estimated) |
| Overall Length | 22 mm |
| Head Type | Hex socket (Allen), 6 mm drive |
| Weight | 12 g (0.42 oz) |
| OEM Reference | ZF 0631.612.064 |
| Torque Specification | 18 N·m (13.3 lb-ft) |
Compatibility
This OEM genuine set screw is specifically engineered for the ZF WG191 and WG211 transmission families. It is also compatible with the WG180, WG200, and WG210 series where the same valve body architecture is employed. The 0631.612.064 directly interfaces with the 4657120005: PRESSURE REGULATOR mounting bracket and the 0501211384: VALVE guide rail. For full assembly integrity, always pair this screw with a new 0630532183: INDENTED RING and the 4656306145: PISTON to ensure proper clamping force distribution.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Maintains stable hydraulic pressure to the valve body |
| 0501211384 | VALVE | Directs fluid flow for clutch and band actuation |
| 0630532183 | INDENTED RING | Provides positive retention for the set screw assembly |
| 4656306145 | PISTON | Converts hydraulic pressure into mechanical force |
| 0732042767 | COMPRESSION SPRING | Returns the valve spool to its neutral position |
| 0631610026 | SET SCREW | Alternate thread pitch for adjacent mounting points |
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657301130 | HOUS.FRONT SECT | Forward section of the transmission housing |
| 4657301131 | HOUSING REAR PART | Rear section of the transmission housing |
| 0631306816 | CYLINDRICAL PIN | Aligns valve body components during assembly |
Frequently Asked Questions
Q: Can the ZF 0631.612.064 set screw be reused after removal?
A: No. This is a torque-to-yield fastener designed for single-use installation. Reusing it risks thread stripping and loss of clamping force, which can lead to fluid leaks or component misalignment.
Q: What tools are required to install this set screw?
A: A 6 mm hex key (Allen wrench) and a torque wrench capable of 18 N·m are required. Always clean the threaded bore with compressed air before installation to prevent debris from damaging the threads.
Q: Does this part fit the ZF WG180 transmission?
A: Yes. The 0631.612.064 is cross-compatible with WG180, WG200, WG210, WG191, and WG211 series transmissions that share the same valve body mounting pattern.
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