Overview
The ZF 4644.131.042 FILLER NOZZLE is a precision-engineered fluid delivery component designed exclusively for the WG 200 series transmission platform. This OEM genuine part serves as the primary interface for introducing transmission fluid into the hydraulic circuit, ensuring correct fill levels and preventing contamination ingress. The SKU 4644.131.042 is located on the upper housing assembly, directly interfacing with the TRANSMISSION HOUSING (4644101234) and the TRANSMISSION HOUSING (4644301282) to create a sealed fill path. Manufactured to ZF’s stringent tolerances, this nozzle maintains the critical fluid level necessary for proper clutch pack engagement and torque converter operation.
Symptoms of Failure
- Transmission fluid seepage at the fill port: A worn or cracked filler nozzle allows oil to escape around the cap interface, leaving visible drips on the housing exterior and a burnt fluid odor during operation.
- Erratic gear engagement or delayed shifting: When the nozzle fails to seal, air enters the hydraulic system, causing inconsistent line pressure and resulting in “ZF WG200 slipping between gears” or harsh upshifts.
- Overheating due to low fluid level: A compromised nozzle permits fluid loss over time, leading to insufficient lubrication and elevated sump temperatures—often flagged by a “transmission overtemp” warning in heavy-duty applications.
- Contaminated fluid from debris ingress: Cracks in the nozzle body allow dirt and moisture to enter the sump, accelerating wear on the VALVE BLOCK (4644306560) and shift solenoids.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.131.042 |
| OEM Reference | ZF 4644.131.042 |
| Material | Die-cast aluminum with corrosion-resistant coating |
| Overall Length | 85 mm |
| Thread Size | M22 x 1.5 |
| Seal Type | Integrated O-ring (NBR 70) |
| Weight | 0.12 kg |
| Operating Temperature Range | -40°C to +120°C |
| Compatible Fluid | ZF TE-ML 03, 04, 05, 07, 09 |
Compatibility
This filler nozzle is engineered for the ZF WG series of powershift transmissions, with primary fitment on the WG 200 series. It is also compatible with the WG 180 and WG 210 models that share the same upper housing architecture. The part directly mounts to the ADAPTER (4475280078) and is identified via the TYPE PLATE (0730365067) affixed to the transmission housing. Always verify your transmission serial number against ZF’s application guide before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101234 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4644301282 | TRANSMISSION HOUSING | Secondary housing section for clutch pack assembly |
| 4475280078 | ADAPTER | Interface plate between engine bellhousing and transmission |
| 0730365067 | TYPE PLATE | Identification tag with serial number and model code |
| 0631311009 | GROOVED STUD | Fastener for securing filler nozzle to housing |
| 4644106300 | SHIFT SYSTEM | Hydraulic actuator assembly for gear selection |
| 4644306500 | COVER PLATE | Sealing plate over shift system access port |
| 4644159300 | SHIFT SYSTEM | Alternate shift system variant for WG200 models |
| 4644306560 | VALVE BLOCK | Hydraulic control manifold for clutch modulation |
| 4644306408 | WASHER | Sealing washer for filler nozzle mounting bolt |
