Overview
The ZF 4644.231.152 OIL DIPSTICK is a precision-engineered fluid level indicator designed specifically for the WG 201 series transmission. This OEM genuine part provides accurate oil level readings, ensuring optimal lubrication and cooling within the transmission housing. The dipstick sits in the fill tube on the upper side of the transmission assembly, allowing technicians to verify fluid condition and volume quickly. The SKU 4644.231.152 is manufactured to ZF’s exacting tolerances, guaranteeing a secure seal and reliable measurement every time. When paired with a properly sealed TRANSMISSION HOUSING, this dipstick helps prevent contamination and maintains hydraulic pressure stability across the entire gear train.
Symptoms of Failure
- Transmission fluid leaks around the dipstick tube: A worn or cracked dipstick seal allows oil to escape, leading to low fluid levels and potential gear slipping during heavy loads.
- Inaccurate oil level readings causing overheating: A degraded dipstick can give false readings, resulting in overfilling or underfilling—both of which cause thermal stress and erratic shifting.
- Contaminated fluid entering the transmission: A broken dipstick cap or missing O-ring lets dirt and moisture into the system, accelerating wear on internal components like the TRANSMISSION HOUSING.
- Difficulty inserting or removing the dipstick: Bent or corroded dipstick rods indicate material fatigue, often accompanied by a loose fit that compromises the seal around the THREADED BUSH.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.231.152 |
| Material | High-grade steel with corrosion-resistant coating |
| Overall Length | Approx. 320 mm |
| Rod Diameter | 6 mm |
| Weight | 0.12 kg |
| OEM Reference | ZF 4644.231.152 |
| Seal Type | Integrated O-ring (compatible with 0634306198: O-RING) |
| Thread Size | M14 x 1.5 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This dipstick is engineered for the ZF WG 201 series transmissions, including models WG180, WG200, and WG210. It also fits select variants of the WG 200 series used in off-highway and industrial equipment. The part integrates directly with the SCREW PLUG port on the transmission housing, and is commonly replaced alongside the SEALING RING to ensure a leak-free interface. For complete assembly verification, always cross-reference your transmission serial number with the OEM parts list.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301382 | TRANSMISSION HOUSING | Alternative housing variant for WG200 series |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for dipstick tube |
| 0636302005 | SCREW PLUG | Seals the dipstick port when not in use |
| 0634306198 | O-RING | Creates a leak-proof seal between dipstick and housing |
| 0634801098 | SEALING RING | Secondary seal for threaded connections |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Fastener for securing housing components |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Standard fastener for transmission assembly |
