Overview
The ZF 4646.131.041 FILLER NOZZLE is a precision-engineered OEM sub-assembly designed for the WG 250, WG 260, and WG 310 series transmissions. This component serves as the primary fluid entry point, directing hydraulic oil into the transmission sump during refill or maintenance procedures. Positioned on the upper housing of the gearbox, the filler nozzle ensures a clean, controlled flow of transmission fluid, preventing aeration and contamination. The SKU 4646.131.041 is manufactured to exact ZF tolerances, guaranteeing a secure seal and reliable performance under high-temperature operating conditions. When replacing this part, it is critical to inspect the surrounding mounting hardware, including the 0636115293 螺栓 and 0736300232 螺栓, which secure the nozzle assembly to the transmission casing.
Symptoms of Failure
- External oil seepage around the filler neck: A worn or cracked filler nozzle often leads to visible fluid leaks near the top of the transmission, particularly after refilling or during operation.
- Contaminated or aerated transmission fluid: If the nozzle fails to seal properly, air can be drawn into the system, causing foamy oil and erratic gear engagement.
- Difficulty achieving correct fluid level: A damaged nozzle may allow fluid to bypass the fill port, making it impossible to accurately measure or maintain the proper oil level.
- Whining or cavitation noise from the pump: Air ingestion through a compromised filler nozzle can starve the 0501214611 齿轮泵, leading to audible noise and reduced hydraulic pressure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4646.131.041 |
| Material | Reinforced Nylon / Aluminum Alloy |
| Overall Length | Approx. 95 mm |
| Thread Size | M22 x 1.5 (Inlet) |
| Weight | 0.12 kg (0.26 lbs) |
| OEM Reference | ZF 4646.131.041 |
| Operating Temperature Range | -40°C to +120°C |
| Sealing Method | Integrated O-Ring (see 0634316523 O-RING) |
Compatibility
This filler nozzle is specifically engineered for the ZF WG 250, WG 260, and WG 310 series transmissions. It is a direct replacement for units in the WG 261 and WG 311 sub-series, which share identical housing geometries. While primarily designed for these models, the 4646.131.041 may also be compatible with earlier WG 180 and WG 200 variants, provided the filler port location and thread pitch match. Always verify fitment by comparing the nozzle profile against your existing assembly. For a complete seal, pair this nozzle with a new 4475280208 SCREW PLUG and inspect the 0634316523 O-RING for wear during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Mounting bolt for filler nozzle bracket |
| 0736300232 | 螺栓 | Secondary securing bolt for nozzle assembly |
| 4475280208 | SCREW PLUG | Seals the filler port when not in use |
| 0634316523 | O-RING | Primary seal between nozzle and housing |
| 0630361026 | SEALING CAP | Protective cap for filler nozzle exterior |
| 0501214611 | 齿轮泵 | Hydraulic pump driven by transmission |
| 0634313945 | O形圈 | Seal for pump mounting flange |
| 0501322534 | TEMPERATURE SENSOR | Monitors fluid temperature near fill port |
| 0634313366 | O-RING | Seal for temperature sensor |
| 4646130044 | ENGINE CONNECTION | Interface plate between engine and transmission |
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