Overview
The ZF 4642.131.020 FILLER NOZZLE is a precision-engineered fluid delivery component designed for the WG180 and WG200 series transmissions. This OEM genuine part serves as the primary oil fill port, directing hydraulic fluid into the main sump during service intervals. Located on the upper section of the TRANSMISSION HOUSING (4642101109), the filler nozzle ensures a clean, controlled flow of transmission oil while preventing debris ingress. The SKU 4642.131.020 is manufactured to ZF’s exacting tolerances, guaranteeing a leak-proof seal and consistent fluid levels critical for clutch pack engagement and torque converter operation.
Symptoms of Failure
- Transmission oil leaks around the fill port: A cracked or warped filler nozzle allows fluid to escape during operation, leading to low oil levels and potential gear slipping under load.
- Difficulty filling transmission fluid: A deformed nozzle neck prevents proper funnel or pump attachment, causing spillage and under-filling during maintenance.
- Contaminated transmission fluid: A broken seal at the nozzle base allows dirt and moisture to enter the sump, accelerating wear on internal components like the TRANSMISSION HOUSING (4642301205).
- Erratic shift quality: Insufficient fluid volume from a leaking nozzle causes hydraulic pressure drops, resulting in delayed or harsh gear changes.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4642.131.020 |
| Material | Die-cast aluminum with corrosion-resistant coating |
| Overall Length | 95 mm |
| Inlet Diameter | 22 mm |
| Mounting Thread | M18 x 1.5 |
| Weight | 0.12 kg |
| OEM Reference | ZF 4642.131.020 |
| Seal Type | Integrated O-ring (nitrile rubber) |
Compatibility
This filler nozzle is specifically engineered for ZF WG180 and WG200 series transmissions, commonly found in heavy-duty construction equipment, agricultural tractors, and industrial material handlers. It also fits select WG150 series variants where the fill port geometry matches. The part interfaces directly with the GROOVED STUD (0631311009) that secures the nozzle to the housing, and the TYPE PLATE (0730365125) is often replaced simultaneously to ensure correct fluid specifications are visible. Always verify your transmission serial number against ZF’s compatibility chart before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear sets and shafts |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG200 models |
| 0730365125 | TYPE PLATE | Identification plate with fluid capacity specs |
| 0631311009 | GROOVED STUD | Fastening stud for filler nozzle retention |
| 4642301168 | SCREEN SHEET | Filter screen for oil return line |
| 4642301169 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 0636100621 | HEXAGON SCREW | Mounting bolt for cover plates |
| 4642301186 | SCREEN SHEET | Debris screen for cooler line |
| 4644106300 | SHIFT SYSTEM | Hydraulic valve assembly for gear selection |
| 4644306500 | COVER PLATE | Access cover for shift mechanism inspection |
