Overview
The ZF 4644.231.059 OIL LEVEL TUBE is a precision-engineered component designed specifically for the WG 180 series transmission. This genuine OEM part ensures accurate fluid level monitoring within the transmission sump, preventing both overfilling and underfilling conditions. Located on the side of the main TRANSMISSION HOUSING, the tube provides a reliable conduit for oil level verification during maintenance intervals. The SKU 4644.231.059 is manufactured to ZF’s exacting tolerances, guaranteeing a perfect seal and consistent performance in heavy-duty industrial applications.
Symptoms of Failure
- Transmission oil leaks around the sump area – A cracked or corroded oil level tube often causes slow, persistent drips that leave puddles under the vehicle, especially after prolonged operation.
- Erratic gear engagement or slipping – When the tube fails, inaccurate oil level readings lead to improper fluid volume, causing the transmission to slip between gears or hesitate during shifts.
- Overheating transmission with no visible cause – A blocked or damaged tube prevents proper oil level checks, resulting in low fluid levels that reduce cooling efficiency and increase thermal stress.
- Foaming or aerated transmission fluid – Air ingress through a compromised tube fitting introduces bubbles into the hydraulic circuit, leading to spongy shift feel and premature wear on internal components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.231.059 |
| Material | Steel with corrosion-resistant coating |
| Length | 210 mm (estimated) |
| Outer Diameter | 18 mm |
| Weight | 0.15 kg |
| OEM Reference | ZF 4644.231.059 |
| Sealing Method | O-ring interface |
Compatibility
This oil level tube is primarily designed for the ZF WG 180 series transmissions, commonly found in municipal buses, construction vehicles, and industrial machinery. It also fits select variants of the WG 200 series where the sump configuration matches. The part integrates directly with the HOUSING assembly and requires the GROOVED STUD for secure mounting. Always verify the TYPE PLATE on your transmission to confirm model compatibility before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301333 | HOUSING | Secondary housing for valve body components |
| 0730365125 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Mounting fastener for oil level tube |
| 0636305019 | SCREW PLUG | Seals oil drain or fill ports |
| 4644301247 | THREADED BUSH | Reinforced insert for threaded connections |
| 0634303485 | O-RING | Sealing ring for fluid-tight joints |
| 4644106055 | SHIFT SYSTEM | Controls gear selection mechanism |
| 4642306050 | COVER PLATE | Protective cover for transmission access points |
| 4644306464 | GASKET | Sealing layer between mating surfaces |
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