Overview
The ZF 4646.131.402 BOQUILLA DE LLENADO is a critical fill nozzle assembly designed for the WG 250, WG 260, and WG 310 transmission series. This OEM subcomponent serves as the primary oil fill port, allowing precise fluid introduction into the transmission housing while maintaining a sealed environment. Positioned on the upper casing of the gearbox, the 4646.131.402 ensures that transmission fluid enters the system without contamination or aeration. This part is essential for maintaining proper lubrication levels within the TRANSMISSION HOUSING, directly impacting clutch pack cooling and gear durability. As a direct OEM replacement, the SKU 4646.131.402 guarantees a factory-spec fit for heavy-duty construction machinery applications.
Symptoms of Failure
- Transmission fluid leakage at the fill port: A worn or cracked 4646.131.402 boquilla de llenado often results in visible oil seepage around the top of the transmission, leading to low fluid levels and potential overheating.
- Difficult or imprecise fluid filling: When the fill nozzle assembly deforms or its internal seal degrades, operators may struggle to insert the fill hose, causing spillage and air entrapment during maintenance.
- Contaminated transmission fluid: A compromised boquilla allows dirt and moisture to bypass the seal, introducing debris directly into the HOUSING and accelerating wear on internal components.
- Erratic gear engagement under load: Insufficient fluid volume due to a leaking fill port can cause intermittent pressure drops, resulting in slipping or delayed shifts in WG series transmissions.
Technical Specifications
| Property | Value |
| Part Number | 4646.131.402 |
| Material | Reinforced Nylon / Aluminum Alloy |
| Overall Length | 85 mm |
| Thread Size | M22 x 1.5 |
| Seal Type | Integrated O-Ring (NBR) |
| Weight | 0.12 kg |
| OEM Reference | ZF 4646.131.402 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This boquilla de llenado is engineered specifically for ZF’s WG series powershift transmissions used in construction machinery. It is a direct fit for the WG 250, WG 260, and WG 310 models. The part also interfaces correctly with earlier WG 180 and WG 200 variants when used in conjunction with the correct COVER assembly. For proper sealing, ensure the mating surface on the COVER SHEET is clean and undamaged. This component is not compatible with ZF’s Ecolife or AS Tronic series without adapter kits.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101152 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4646301317 | HOUSING | Secondary housing for valve body and shift components |
| 4646301332 | COVER | Top cover plate sealing the transmission cavity |
| 4646301102 | COVER SHEET | Gasket or sheet cover for fluid retention |
| 4646301292 | COVER SHEET | Alternate cover sheet for specific WG variants |
| 0636115293 | 螺栓 | Mounting bolt for transmission covers |
| 0636102404 | HEXAGON SCREW | Hex head fastener for housing attachment |
| 4646201021 | BREATHER | Pressure equalization vent for transmission |
| 4646106025 | SHIFT SYSTEM | Complete shift mechanism assembly |
| 0736300232 | 螺栓 | High-strength bolt for shift system mounting |
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