Overview
The ZF 4646.131.039 BOQUILLA DE LLENADO (Fill Nozzle) is a precision-engineered subassembly designed for the WG 250, WG 260, and WG 310 transmission series. This OEM-grade component serves as the primary fluid entry point, directing hydraulic oil and transmission fluid into the main sump without spillage or aeration. Located on the upper casing of the gearbox, the 4646.131.039 interfaces directly with the 4646101112: TRANSMISSION HOUSING to ensure a sealed, pressurized fill path. Its robust construction prevents contamination ingress during maintenance, making it critical for long-term drivetrain reliability in heavy construction machinery.
Symptoms of Failure
- Visible fluid seepage around the fill port: A worn or cracked boquilla de llenado often causes slow oil drips, leading to low fluid levels and potential gear damage.
- Difficulty achieving proper transmission fluid level: If the nozzle deforms or its internal seal degrades, air can enter the system, causing erratic pressure readings and incomplete filling.
- Whining or grinding noises during cold starts: Insufficient fluid delivery due to a compromised fill nozzle starves the torque converter, producing metallic sounds under load.
- Contaminated oil with debris: A fractured boquilla allows dirt and moisture to bypass the filter, accelerating wear on internal components like the 4646301316: HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4646.131.039 |
| Material | Reinforced cast aluminum with nitrile seal |
| Overall Length | 85 mm |
| Thread Size | M22 x 1.5 |
| Weight | 0.18 kg |
| OEM Reference | ZF 4646.131.039 |
| Operating Temperature Range | -40°C to +120°C |
| Seal Type | Integrated O-ring (NBR 70) |
Compatibility
This fill nozzle is engineered for the ZF WG series powershift transmissions used in wheel loaders, graders, and telehandlers. It is a direct fit for the following models: WG 250, WG 260, and WG 310. The 4646.131.039 also retrofits into earlier WG 180 and WG 200 variants when used with the appropriate 4646301283: COVER adapter. For secure mounting, always pair this part with a new 0636015304: HEXAGON SCREW to maintain torque specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101112 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4646301316 | HOUSING | Intermediate support for clutch packs |
| 4646301283 | COVER | Seals the upper transmission cavity |
| 0636015304 | HEXAGON SCREW | Fastens fill nozzle to housing |
| 0636101828 | CAP SCREW | Secures cover plate assembly |
| 4646201022 | COVER SHEET | Protective shield for internal components |
| 4646301295 | SCREEN SHEET | Filter mesh for fluid intake |
| 0730365190 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 0636101193 | CAP SCREW | High-torque fastener for cover |
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