Overview
The ZF 4646.231.029 OIL LEVEL TUBE is a precision-engineered component designed specifically for the WG250 transmission series. This OEM genuine part ensures accurate oil level measurement within the transmission sump, preventing both overfilling and underfilling that can compromise lubrication and cooling. The tube is installed directly into the transmission housing, acting as a guide for the dipstick to reach the correct depth. As a critical fluid management component, the SKU 4646.231.029 works in concert with the TRANSMISSION HOUSING to maintain proper hydraulic pressure and gear protection. Its robust construction withstands constant exposure to hot transmission fluid and vibration, making it a reliable part for heavy-duty industrial applications.
Symptoms of Failure
- Transmission fluid leaking from the dipstick area: A cracked or warped oil level tube allows ATF to escape, often pooling around the tube base or dripping onto the housing. This is a common sign that the 4646.231.029 has degraded.
- Inaccurate oil level readings causing gear slipping: When the tube becomes blocked or deformed, the dipstick cannot seat properly, leading to false readings. Low fluid levels from misreading can cause gear slipping and delayed engagement.
- Contaminated fluid entering the transmission: A broken seal at the tube’s connection point can allow dirt and moisture to bypass the filter, accelerating wear on internal components like the HOUSING and clutch packs.
- Visible cracks or deformation near the mounting flange: Thermal cycling and vibration often cause stress fractures at the tube’s base, which can be spotted during routine visual inspections.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4646.231.029 |
| Material | Steel with corrosion-resistant coating |
| Overall Length | Approx. 280 mm |
| Tube Outer Diameter | 12 mm |
| Weight | 0.15 kg |
| OEM Reference | ZF 4646.231.029 |
| Thread Type | M10 x 1.5 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This oil level tube is primarily designed for the ZF WG250 transmission series, but it also fits select models in the WG180, WG200, and WG210 families due to shared sump architecture. It is commonly used in off-highway vehicles, construction equipment, and industrial machinery where the WG250 gearbox is installed. For proper fitment, always verify that the tube aligns with the COVER and is secured using the HEXAGON SCREW provided in the assembly kit. Cross-reference your transmission serial number with the ZF parts catalog to ensure compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101029 | TRANSMISSION HOUSING | Main casing that encloses gears and shafts |
| 4646301090 | HOUSING | Secondary housing for valve body assembly |
| 4646301087 | COVER | Seals the transmission housing opening |
| 0636015304 | HEXAGON SCREW | Fastener for securing covers and tubes |
| 0636101828 | CAP SCREW | Threaded fastener for high-torque applications |
| 4646301102 | COVER SHEET | Thin protective plate for internal components |
| 4646301235 | COVER SHEET | Alternate cover sheet for variant assemblies |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment pin for precise component placement |
| 0636101193 | CAP SCREW | Additional fastener for cover attachment |
