Overview
The ZF 0501.209.156 HOSE PIPE is a critical fluid transfer component engineered specifically for the WG 250 and WG 260 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 gearbox. The SKU 0501.209.156 identifies a precision-formed pipe designed to withstand high-pressure surges and thermal cycling common in heavy-duty industrial applications. Without this hose pipe, the transmission cannot maintain proper oil flow, leading to rapid component wear.
Symptoms of Failure
- Hydraulic oil seepage at the pipe connection points: When the 0501.209.156 hose pipe develops micro-cracks or flange distortion, you will notice oil weeping around the banjo fittings or crimp collars, often mistaken for a simple gasket failure.
- Erratic gear engagement under load: A compromised hose pipe causes pressure drops in the clutch pack circuit, resulting in delayed or harsh shifts when the WG250/WG260 is under heavy torque demand.
- Overheating transmission fluid: Restricted flow through a collapsed or internally delaminated pipe reduces cooler circuit efficiency, triggering thermal alarms on the vehicle dashboard or control panel.
- Audible whining from the pump: Air ingestion through a cracked hose pipe creates cavitation noise, which progressively worsens as the fluid level drops due to external leakage.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.209.156 |
| Material | Reinforced synthetic rubber with braided steel jacket |
| Overall Length | 380 mm (estimated) |
| Inner Diameter | 12.7 mm (1/2 inch) |
| Working Pressure | 25 bar (362 psi) |
| Burst Pressure | 100 bar (1,450 psi) |
| Weight | 0.45 kg |
| OEM Reference | ZF 0501.209.156 |
Compatibility
This genuine ZF hose pipe is primarily designed for the WG 250 Series and WG 260 Series transmissions. It is also compatible with earlier WG180 and WG200 variants that share the same hydraulic circuit architecture. The 0501.209.156 pipe interfaces directly with the TRANSMISSION HOUSING (4646101028) and the HOUSING (4646301095) assembly. For secure mounting, it requires the HEXAGON SCREW (0636015304) and the COVER (4646301087) to seal the routing channel. Always verify your transmission model tag before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4646301095 | HOUSING | Secondary housing for valve body |
| 4646301087 | COVER | Seals the pipe routing cavity |
| 0636015304 | HEXAGON SCREW | Fastens cover to housing |
| 0636101828 | CAP SCREW | Secures pipe flange to valve body |
| 4646301102 | COVER SHEET | Protective shield over pipe assembly |
| 4646301098 | COVER SHEET | Alternate shield for WG260 models |
| 0730365125 | TYPE PLATE | Identification tag for transmission |
| 0631311009 | GROOVED STUD | Alignment dowel for housing mating |
| 0636101193 | CAP SCREW | Mounts cooler line bracket |
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