Overview
The ZF 0501.209.165 HOSE PIPE is a critical fluid transfer component engineered specifically for the WG 251 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. As an integral element of the lubrication system, the SKU 0501.209.165 maintains the precise flow required for clutch pack engagement and planetary gear set operation. When paired with a robust TRANSMISSION HOUSING, this hose pipe prevents pressure drops that can compromise shift quality.
Symptoms of Failure
- External hydraulic oil seepage at the hose pipe connection points – Visible fluid accumulation near the transmission bell housing or cooler lines often indicates a cracked or swollen 0501.209.165 hose pipe, leading to gradual fluid loss.
- Erratic gear engagement or delayed shifting under load – A compromised hose pipe reduces line pressure, causing the transmission to slip between gears or hesitate during acceleration, especially in WG251 units operating at high torque.
- Overheating transmission fluid with burnt odor – Restricted flow through a collapsed or internally delaminated hose pipe starves the cooler, resulting in thermal degradation of the ATF and potential damage to the HOUSING assembly.
- Audible whining or cavitation noise from the pump – Air ingestion through a porous hose pipe creates aeration in the hydraulic circuit, producing a high-pitched sound that worsens as fluid temperature rises.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.209.165 |
| OEM Reference | ZF 0501.209.165 |
| Material | Reinforced synthetic rubber with braided textile layer |
| Inner Diameter | 12.7 mm (0.5 in) |
| Outer Diameter | 21.3 mm (0.84 in) |
| Overall Length | 410 mm (16.1 in) |
| Weight | 0.18 kg (0.4 lbs) |
| Operating Pressure | Up to 18 bar (261 psi) |
| Temperature Range | -40°C to +150°C (-40°F to +302°F) |
| Fitting Type | Push-lock with O-ring seal |
Compatibility
This hose pipe is primarily designed for the ZF WG 251 series, but its hydraulic specifications also make it suitable for earlier WG180 and WG200 models when used in cooler circuit applications. The 0501.209.165 interfaces directly with the COVER plate and is secured using CAP SCREW fasteners. It is commonly found in WG180, WG200, WG210, and WG251 transmissions installed in off-highway trucks, wheel loaders, and agricultural tractors. Always verify the routing path against your specific transmission serial number, as variations exist between early and late production units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Main structural casing supporting all internal components |
| 4646301201 | HOUSING | Secondary housing for valve body or clutch pack assembly |
| 4646301166 | COVER | Sealing plate for hydraulic circuit access points |
| 0636101051 | CAP SCREW | Fastener for securing covers and housings |
| 4646201018 | COVER SHEET | Thin gasket or shield for internal passageways |
| 4646301277 | SCREEN SHEET | Filter mesh for debris protection in oil galleries |
| 4646201019 | COVER SHEET | Alternate gasket variant for different housing configurations |
| 0730365125 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0631311009 | GROOVED STUD | Threaded alignment pin for precise component mounting |
| 0636010216 | HEXAGON SCREW | Standard hex-head bolt for general fastening applications |
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