Overview
The ZF 0501.209.071 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 under high-torque conditions. Constructed from reinforced synthetic rubber with a braided textile core, the 0501.209.071 maintains structural integrity against thermal expansion and vibration fatigue. As a direct replacement for the original factory-installed hose, this SKU guarantees exact fitment within the transmission’s internal oil circuit, preventing pressure drops that compromise gear engagement.
Symptoms of Failure
- Transmission fluid puddling under the bell housing – A cracked or swollen 0501.209.071 hose pipe will weep ATF, often mistaken for a main seal leak. Look for oily residue near the WG250’s side cover.
- Delayed forward or reverse engagement – When the hose pipe develops internal delamination, hydraulic pressure drops, causing a 2-3 second lag before the transmission engages after shifting from Park.
- Erratic shift quality under load – A failing hose pipe allows air ingestion into the oil circuit, resulting in harsh 2-3 upshifts or slipping during hill climbs. This symptom worsens as transmission temperature rises.
- Low fluid level without external drips – Internal hose rupture can divert oil into the torque converter housing, causing the dipstick to read low while no visible leak exists.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.209.071 |
| OEM Reference | ZF 0501.209.071 |
| Material | Nitrile rubber with polyester braid reinforcement |
| Inside Diameter | 12.7 mm (0.5 in) |
| Outside Diameter | 19.0 mm (0.75 in) |
| Overall Length | 310 mm (12.2 in) |
| Working Pressure | 18 bar (261 psi) |
| Burst Pressure | 72 bar (1044 psi) |
| Temperature Range | -40°C to +135°C |
| Net Weight | 0.12 kg (0.26 lb) |
Compatibility
This hose pipe is dimensionally and hydraulically validated for the ZF WG250 series, but it also fits earlier WG180 and WG200 variants that share the same oil gallery layout. The 0501.209.071 is commonly used in WG250 transmissions paired with diesel engines from 250-350 hp. For proper installation, the hose must be routed through the 4646101028: TRANSMISSION HOUSING and secured against the 4646301095: HOUSING using the 0636015304: HEXAGON SCREW. The 4646301087: COVER must be removed to access the hose pipe’s banjo fittings. Always replace the hose pipe when servicing the valve body or performing a full transmission overhaul.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and oil passages |
| 4646301095 | HOUSING | Intermediate housing supporting the clutch pack and valve body |
| 4646301087 | COVER | Access cover sealing the hose pipe and control module compartment |
| 0636015304 | HEXAGON SCREW | M8 bolt securing the hose pipe bracket to the housing |
| 0636101828 | CAP SCREW | M10 fastener for the transmission housing end cover |
| 4646301102 | COVER SHEET | Thin metal gasket between the housing and cover plate |
| 4646301098 | COVER SHEET | Secondary gasket for the oil filter access port |
| 0730365125 | TYPE PLATE | Identification plate riveted to the transmission housing |
| 0631311009 | GROOVED STUD | Alignment stud for positioning the valve body assembly |
| 0636101193 | CAP SCREW | M6 bolt for the oil pan attachment |
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