Overview
The ZF 0501.209.155 HOSE PIPE is a critical fluid transfer component engineered specifically for the WG 250 Series transmission. This OEM genuine part channels pressurized hydraulic oil between the valve body and the clutch pack assembly, ensuring precise shift timing and consistent lubrication. As a direct replacement for the original equipment, the SKU 0501.209.155 guarantees factory-specified flow rates and pressure tolerances. When installed alongside the 4646101028: TRANSMISSION HOUSING, this hose pipe maintains the sealed circuit integrity required for heavy-duty industrial applications.
Symptoms of Failure
- External hydraulic oil seepage at the hose pipe connection points – A worn 0501.209.155 often develops micro-cracks near the crimped fittings, leading to visible drips under the transmission bell housing.
- Delayed or harsh gear engagement during cold starts – Reduced internal diameter from swelling or collapse restricts fluid flow, causing sluggish clutch pack pressurization.
- Erratic shift patterns under load – A failing hose pipe allows pressure fluctuations, resulting in unexpected gear hunting or momentary loss of drive torque.
- Low transmission fluid level without external puddles – Internal delamination of the hose wall can allow fluid to bypass into the 4646301095: HOUSING cavity, masking the leak source.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.209.155 |
| Product Type | Hydraulic Hose Pipe |
| Length (Overall) | 385 mm ± 2 mm |
| Inner Diameter | 12.7 mm (1/2 inch) |
| Outer Diameter | 21.3 mm |
| Material | Reinforced synthetic rubber with braided steel jacket |
| Weight | 0.34 kg |
| OEM Reference | ZF 0501.209.155 |
| Burst Pressure | 45 bar (650 psi) |
| Operating Temperature Range | -40°C to +120°C |
| Fitting Type | Swivel 90° banjo (both ends) |
Compatibility
This hose pipe is primarily validated for the ZF WG 250 Series, but its hydraulic routing geometry also suits the WG 180 and WG 200 models when used with the correct 4646301087: COVER adapter. It is not compatible with the WG 120 or WG 150 series due to different port spacing. Always verify the routing path against the 0636015304: HEXAGON SCREW mounting points on your specific transmission housing before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and valve body |
| 4646301095 | HOUSING | Secondary housing for clutch pack and hydraulic manifold |
| 4646301087 | COVER | Sealing plate that protects the hose pipe routing channel |
| 0636015304 | HEXAGON SCREW | M10 fastener securing the hose pipe bracket to the housing |
| 0636101828 | CAP SCREW | M8 bolt for attaching the cover plate over the hose pipe |
| 4646301102 | COVER SHEET | Thin metal shield preventing debris contact with the hose |
| 4646301098 | COVER SHEET | Alternate shield variant for WG 250 with different bolt pattern |
| 0730365125 | TYPE PLATE | Identification label riveted to the transmission housing |
| 0631311009 | GROOVED STUD | Alignment pin for positioning the hose pipe bracket |
| 0636101193 | CAP SCREW | M6 screw for securing the type plate to the housing |
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