Overview
The ZF 4644.121.484 OIL PIPE is a precision-engineered fluid conduit designed specifically for the WG 200 series transmission. This OEM genuine part ensures the correct routing of pressurized hydraulic oil to the clutch packs and valve body, maintaining optimal lubrication and cooling within the transmission assembly. The SKU 4644.121.484 is a direct replacement component that restores factory-specified oil flow, preventing pressure drops that can lead to shifting irregularities. This oil pipe integrates seamlessly with the 4644101176 TRANSMISSION HOUSING and the 4644301371 TRANSMISSION HOUSING, forming a critical part of the internal lubrication circuit.
Symptoms of Failure
When the ZF 4644.121.484 oil pipe deteriorates or becomes clogged, operators typically notice three distinct failure modes. First, external oil seepage around the pipe connection points often appears as wet spots on the transmission housing, leading to gradual fluid loss. Second, delayed gear engagement during cold starts or under load indicates insufficient hydraulic pressure reaching the clutch packs. Third, intermittent transmission overheating occurs when the pipe cannot deliver adequate cooling oil to high-friction zones. Fourth, erratic shift quality—including harsh upshifts or slipping during acceleration—suggests the oil pipe is restricting flow to the valve body. These symptoms often worsen when the 0730365067 TYPE PLATE is missing or damaged, as it helps secure the pipe routing.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.121.484 |
| OEM Reference | ZF 4644.121.484 |
| Material | Seamless steel tube with anti-corrosion coating |
| Length | 285 mm (estimated) |
| Outer Diameter | 12 mm |
| Wall Thickness | 1.5 mm |
| Weight | 0.18 kg |
| Connection Type | Flare fitting with O-ring seal |
| Operating Pressure | Up to 18 bar |
| Temperature Range | -40°C to +120°C |
Compatibility
This oil pipe is primarily engineered for the ZF WG 200 series transmissions, including the WG200, WG210, and WG220 variants. It also fits select WG180 models produced after 1998, where the lubrication circuit was updated. The pipe interfaces directly with the 0631311009 GROOVED STUD for secure mounting. For complete assembly verification, always cross-reference the transmission serial number against the 0730365067 TYPE PLATE specifications. This part is not compatible with older WG150 or WG170 series without adapter kits.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101176 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301371 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Fastener for oil pipe retention |
| 4644303060 | COVER PLATE | Seals access port on housing |
| 4644201011 | COVER PLATE | Lower cover for oil pan area |
| 4644201010 | COVER PLATE | Upper cover for valve body access |
| 4644301372 | COVER PLATE | Side cover for clutch housing |
| 0636610028 | STUD | Threaded rod for housing assembly |
| 0634306525 | O-RING | Seal for oil pipe connections |
