Overview
The ZF 4646.131.402 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 housing during service and refill operations. Located on the upper section of the transmission assembly, it interfaces directly with the TRANSMISSION HOUSING to ensure a sealed, debris-free flow path. The SKU 4646.131.402 is manufactured to ZF’s exacting tolerances, guaranteeing a secure fit and preventing contamination of the internal hydraulic circuit. Without this nozzle, proper lubrication and clutch actuation cannot be maintained, making it a critical component for transmission longevity.
Symptoms of Failure
- Hydraulic fluid seepage around the filler neck: A worn or cracked 4646.131.402 nozzle often causes slow oil leaks at the top of the transmission, leading to low fluid levels and eventual gear slipping.
- Difficulty during fluid refill or air ingestion: If the nozzle is deformed or clogged, air can enter the system, resulting in erratic shifting and spongy clutch engagement in WG 260 series units.
- Contaminated transmission oil: A degraded seal at the filler nozzle allows dirt and moisture to bypass the cap, accelerating internal wear and reducing the lifespan of the HOUSING assembly.
- Whining noise from the pump: Insufficient fluid delivery due to a restricted nozzle creates cavitation, producing a high-pitched whine during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.131.402 |
| Material | Reinforced Nylon / Aluminum Alloy |
| Weight | 0.12 kg (0.26 lbs) |
| Overall Length | 85 mm |
| Inlet Diameter | 22 mm |
| OEM Reference | ZF 4646.131.402 |
| Seal Type | Integrated O-Ring |
Compatibility
This filler nozzle is engineered for the ZF WG series powershift transmissions, specifically the WG 250, WG 260, and WG 310 models. It is a direct fit for all WG 260 series variants, including those used in construction and agricultural machinery. The part also integrates with the COVER and COVER SHEET to complete the upper housing seal. While primarily designed for these three series, it may be retrofitted to earlier WG 180 or WG 200 transmissions with minor modifications, though ZF recommends verifying housing geometry first.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101152 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4646301317 | HOUSING | Secondary housing for valve body |
| 4646301332 | COVER | Top cover sealing the filler area |
| 4646301102 | COVER SHEET | Gasket layer for leak prevention |
| 4646301292 | COVER SHEET | Alternate gasket for WG 260 |
| 0636115293 | 螺栓 | Mounting bolt for nozzle |
| 0636102404 | HEXAGON SCREW | Fastener for housing assembly |
| 4646201021 | BREATHER | Pressure equalization vent |
| 4646106025 | SHIFT SYSTEM | Gear selection mechanism |
| 0736300232 | 螺栓 | Secondary mounting bolt |
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