Overview
The ZF 0501.209.072 HOSE PIPE is a critical fluid transfer component engineered specifically for the WG 250 transmission series. This OEM genuine part channels pressurized hydraulic oil between the valve body and the cooler circuit, ensuring consistent lubrication and thermal regulation within the gear train. Positioned along the upper casing assembly, the SKU 0501.209.072 directly interfaces with the TRANSMISSION HOUSING and the HOUSING to maintain leak-free operation under high-temperature conditions. Replacing a degraded hose pipe with this genuine ZF part restores proper hydraulic pressure and prevents contamination of the transmission fluid.
Symptoms of Failure
- External hydraulic oil seepage – Visible fluid accumulation around the hose pipe connections or along the COVER mating surface indicates a cracked or swollen hose pipe.
- Erratic gear engagement or slipping – A compromised hose pipe reduces line pressure, causing delayed shifts or clutch slip during load cycles.
- Overheating transmission – Restricted oil flow through a collapsed hose pipe leads to elevated sump temperatures and degraded fluid viscosity.
- Whining or cavitation noise – Air ingestion through a fractured hose pipe produces a high-pitched sound from the pump circuit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.209.072 |
| Material | Reinforced synthetic rubber with braided textile |
| Inside Diameter | 12 mm (nominal) |
| Overall Length | 310 mm (center-to-center) |
| Operating Pressure | Up to 18 bar (261 psi) |
| Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 0501.209.072 |
| Weight | 0.14 kg |
Compatibility
This hose pipe is a direct fit for the ZF WG 250 series and its closely related variants, including the WG 180, WG 200, and WG 210 models. It also applies to certain WG 300 configurations that share the same hydraulic circuit layout. The part mounts between the HEXAGON SCREW ports on the main housing and the cooler return block. Always verify the routing against your transmission’s serial number to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Encloses gear sets and supports hydraulic circuits |
| 4646301095 | HOUSING | Secondary casing for valve body and oil passages |
| 4646301087 | COVER | Seals the upper access port for internal inspection |
| 0636015304 | HEXAGON SCREW | Secures hose pipe flanges to housing bosses |
| 0636101828 | CAP SCREW | Fastens cover plates with high torque retention |
| 4646301102 | COVER SHEET | Thin protective shield over hydraulic galleries |
| 4646301098 | COVER SHEET | Alternate thickness cover for variant housings |
| 0730365125 | TYPE PLATE | Identification tag with transmission serial data |
| 0631311009 | GROOVED STUD | Alignment dowel for precise cover positioning |
| 0636101193 | CAP SCREW | Low-profile fastener for confined spaces |
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