Overview
The ZF 4616.131.012 FILLER NOZZLE is a precision-engineered fluid delivery component designed exclusively for the WG 65 series transmission family. This OEM genuine part controls the precise flow and direction of transmission oil during the filling process, ensuring optimal lubrication and hydraulic pressure within the gearbox. Installed directly into the TRANSMISSION HOUSING, the filler nozzle (SKU 4616.131.012) acts as the primary interface between the external fill system and the internal oil galleries. Its calibrated orifice and robust construction prevent backflow and maintain consistent fluid levels under high-temperature operating conditions.
Symptoms of Failure
- External oil seepage around the fill port: A worn or cracked filler nozzle allows transmission fluid to escape past the sealing surfaces, leaving visible drips or wet spots on the transmission housing.
- Erratic gear engagement or delayed shifting: When the nozzle fails to direct oil properly, hydraulic pressure drops, causing hesitation or harsh shifts during acceleration.
- Overheating transmission due to low fluid level: A compromised nozzle can cause slow or incomplete filling, leading to chronic under-filling and elevated operating temperatures.
- Whining or groaning noise from the pump: Air ingestion through a damaged filler nozzle creates cavitation, producing audible mechanical noise from the hydraulic circuit.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4616.131.012 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Overall Length | 68 mm |
| Thread Size | M22 x 1.5 |
| Seal Type | Integrated O-ring groove |
| Weight | 0.12 kg |
| OEM Reference | ZF 4616.131.012 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This filler nozzle is engineered for the ZF WG 65 series, which includes the WG65, WG80, WG100, WG120, WG150, WG180, and WG200 transmission models. It is a direct replacement for units originally equipped with the 4616.131.012 nozzle. The part interfaces with the HOUSING (4616301307) and HOUSING (4616301309) assemblies, and is secured using HEXAGON SCREW (0636011118) fasteners. Always verify your transmission model number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101066 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 0636011118 | HEXAGON SCREW | Fastener for housing and nozzle mounting |
| 4616301307 | HOUSING | Intermediate housing for valve body |
| 4616301309 | HOUSING | Rear housing for clutch pack |
| 0636011038 | HEXAGON SCREW | M8 x 20 mounting screw |
| 0636016015 | HEXAGON SCREW | M10 x 30 high-torque fastener |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0634313118 | O-RING | Seal for filler nozzle interface |
| 0636304019 | SCREW PLUG | Drain or fill port plug |
| 0634801152 | SEALING RING | Copper washer for leak-proof seal |
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