Overview
The ZF 0501.209.164 HOSE PIPE is a critical fluid transfer component engineered specifically for the WG 251 Series transmission. This OEM genuine part channels pressurized hydraulic oil between the valve body and the clutch pack assembly, ensuring precise actuation and lubrication within the gear train. Constructed from reinforced synthetic rubber with a braided textile layer, the hose pipe resists degradation from ATF (Automatic Transmission Fluid) at operating temperatures up to 120°C. The SKU 0501.209.164 is a direct replacement for the original factory-installed line, maintaining the exact bend radius and flow characteristics required for consistent shift quality in heavy-duty applications.
Symptoms of Failure
- External ATF seepage at hose-to-fitting junctions: Cracks in the hose wall or loose crimp connections allow fluid to weep, leaving oily residue on the transmission housing and bell housing area.
- Delayed or harsh engagement between gears: A collapsed or internally delaminated hose restricts fluid flow, causing pressure drops that result in sluggish shifts or sudden clutch application.
- Transmission overheating under load: Reduced hydraulic flow from a kinked or blocked hose pipe starves the torque converter and cooler circuit, leading to elevated sump temperatures and potential thermal damage.
- Audible whining or groaning from the pump: Air ingestion through a compromised hose creates cavitation noise, often accompanied by erratic shift patterns and reduced line pressure readings.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.209.164 |
| OEM Reference | ZF 0501.209.164 |
| Material | Nitrile rubber (NBR) with polyester braid reinforcement |
| Inside Diameter | 12.7 mm (0.5 in) |
| Outside Diameter | 19.0 mm (0.75 in) |
| Overall Length | 410 mm (16.1 in) |
| Working Pressure | 15 bar (217 psi) |
| Burst Pressure | 60 bar (870 psi) |
| Weight | 0.18 kg (0.4 lb) |
| Temperature Range | -40°C to +125°C |
Compatibility
This hose pipe is a direct-fit component for the ZF WG 251 Series transmission, commonly installed in off-highway trucks, wheel loaders, and industrial machinery. Based on the part type and fluid routing, it also serves as a service replacement for earlier WG 180 and WG 200 models where the hydraulic circuit uses identical banjo fittings and routing clips. Always verify the hose length and end fitting orientation against your existing assembly before installation. The hose pipe connects directly to the 4646101072: TRANSMISSION HOUSING and is secured by the 0636101051: CAP SCREW at the pump outlet port. During a full rebuild, the 4646301201: HOUSING and 4646301166: COVER must be inspected for corrosion or thread damage before fitting the new hose pipe.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Main structural casing that supports all internal components |
| 4646301201 | HOUSING | Secondary housing for the clutch pack and valve body assembly |
| 4646301166 | COVER | Sealing cover for the hydraulic control module |
| 0636101051 | CAP SCREW | Fastener for securing hose pipe fittings to the housing |
| 4646201018 | COVER SHEET | Gasket layer between housing and cover plate |
| 4646301277 | SCREEN SHEET | Filter mesh for the oil pickup tube |
| 4646201019 | COVER SHEET | Secondary gasket for the valve body cover |
| 0730365125 | TYPE PLATE | Identification tag with transmission serial number |
| 0631311009 | GROOVED STUD | Threaded alignment pin for housing assembly |
| 0636010216 | HEXAGON SCREW | Standard bolt for cover and housing fastening |
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