Overview
The ZF 4644.231.042 OIL DIPSTICK is a precision-machined diagnostic component engineered specifically for the WG 180 series transmission. This genuine OEM part provides a sealed access point for verifying fluid levels and assessing oil condition within the transmission sump. Mounted directly into the TRANSMISSION HOUSING, the dipstick features a calibrated measuring rod that ensures accurate readings during routine maintenance intervals. The SKU 4644.231.042 is manufactured to ZF’s exacting tolerances, guaranteeing a secure fit and reliable fluid level indication throughout the service life of the transmission.
Symptoms of Failure
- Transmission fluid seepage at the dipstick tube base – A worn or cracked dipstick seal allows ATF to escape, often leaving visible drips on the bell housing or undercarriage. This is a common indicator that the 4644.231.042 requires replacement.
- Inaccurate fluid level readings causing gear engagement delays – When the dipstick’s measuring surface becomes corroded or distorted, operators may overfill or underfill the system, leading to harsh shifts or slipping during load changes.
- Contaminated oil entering the transmission through a broken cap seal – A compromised dipstick cap allows moisture and debris to bypass the O-RING seal, accelerating internal wear and reducing hydraulic pressure.
- Visible cracks or deformation on the dipstick shaft – Heat cycling and vibration can cause the plastic or metal shaft to fatigue, resulting in broken pieces that may obstruct the DISCONNECTION valve or sump screen.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.231.042 |
| Overall Length | 385 mm (approx.) |
| Measuring Rod Diameter | 6 mm |
| Material | Chrome-plated steel shaft with high-temp polymer handle |
| Weight | 0.12 kg |
| OEM Reference | ZF 4644.231.042 |
| Seal Type | Integrated O-ring (compatible with 0634306525) |
Compatibility
This genuine ZF dipstick is primarily designed for the WG 180 series transmissions, which are commonly found in medium-duty trucks, buses, and off-highway equipment. The 4644.231.042 also fits select variants of the WG 200 series when equipped with the same OUTPUT FLANGE configuration. For installations using the HEXAGON SCREW fasteners, verify that the dipstick tube alignment matches the housing port depth. Always cross-reference your transmission’s serial plate—often secured with a TYPE PLATE—to confirm compatibility before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105413 | DISCONNECTION | Isolates transmission from driveline during service |
| 4642303093 | OUTPUT FLANGE | Transfers torque to driveshaft |
| 0636021010 | HEXAGON SCREW | Secures housing and flange components |
| 4644101222 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301226 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for housing assembly |
| 4644301298 | COVER PLATE | Seals access openings in the housing |
| 0634306525 | O-RING | Provides fluid-tight seal at joints |
| 0636305026 | SCREW PLUG | Closes drain or fill ports |
