Overview
The ZF 4644.231.028 OIL LEVEL TUBE is a precision-engineered component designed specifically for the WG150 series transmission. This genuine OEM part ensures accurate fluid level monitoring within the transmission sump, preventing both overfilling and underfilling that can lead to premature wear. The tube is mounted directly into the TRANSMISSION HOUSING (part 4642101109) and provides a sealed pathway for the dipstick, allowing operators to verify oil levels during routine maintenance. As part of the lubrication system, the SKU 4644.231.028 works in conjunction with the TRANSMISSION HOUSING (4642301205) to maintain proper hydraulic pressure and cooling flow.
Symptoms of Failure
- External oil leaks around the tube base: A cracked or degraded O-ring seal at the mounting point often causes visible drips, leading to low fluid levels and potential gear slipping under load.
- Inaccurate dipstick readings: When the tube becomes bent or corroded internally, the dipstick may not seat correctly, giving false oil level indications that result in transmission overheating.
- Contaminated fluid ingress: A fractured tube allows dirt and moisture to enter the sump through the TYPE PLATE (0730365125) interface, accelerating internal component wear.
- Vibration-induced loosening: If the GROOVED STUD (0631311009) securing the tube loosens, the assembly can rattle, causing metal fatigue and eventual separation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.231.028 |
| Material | Steel with zinc-plated finish |
| Overall Length | 385 mm (approx.) |
| Tube Outer Diameter | 12 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 4644.231.028 |
| Seal Type | Integrated O-ring (NBR) |
Compatibility
This oil level tube is engineered for the ZF WG150 series, but its design also accommodates the WG180 and WG200 models due to shared housing interfaces. It is compatible with transmissions using the VALVE HOUSING (4644306565) and SHIFT SYSTEM (4644159321) assemblies. Always verify fitment by cross-referencing your transmission serial number with the OEM parts catalog.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for oil sump |
| 0730365125 | TYPE PLATE | Identification plate for model specs |
| 0631311009 | GROOVED STUD | Fastener for oil level tube bracket |
| 4642301168 | SCREEN SHEET | Filter mesh for oil intake |
| 4642301169 | SCREEN SHEET | Fine filter for hydraulic circuit |
| 0636100621 | HEXAGON SCREW | Mounting bolt for housing |
| 4642301186 | SCREEN SHEET | Debris barrier in oil pan |
| 4644159321 | SHIFT SYSTEM | Gear selection mechanism |
| 4644306565 | VALVE HOUSING | Hydraulic control block |
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