Overview
The ZF 0501.209.162 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. Constructed from reinforced synthetic rubber with a braided textile core, the SKU 0501.209.162 resists degradation from ATF fluids and high operating temperatures. It integrates directly with the TRANSMISSION HOUSING and the HOUSING assembly, forming a sealed pathway that prevents pressure loss during torque converter lockup and clutch engagement cycles.
Symptoms of Failure
- External ATF leakage near the bell housing: A cracked or swollen hose pipe allows fluid to weep onto the COVER surface, leaving visible puddles after extended operation.
- Erratic shift timing or delayed engagement: When the hose collapses internally, hydraulic pressure drops, causing soft shifts or hesitation when moving from neutral to drive.
- Overheating transmission with burnt fluid odor: Restricted flow through a kinked hose pipe reduces cooler circuit efficiency, leading to thermal breakdown of the ATF.
- Whining noise from the pump under load: Air ingestion through a deteriorated hose creates cavitation, producing a high-pitched sound that intensifies during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.209.162 |
| Material | Reinforced NBR rubber with polyester braid |
| Inside Diameter | 12.7 mm (0.5 in) |
| Outside Diameter | 21.3 mm (0.84 in) |
| Overall Length | 410 mm (16.1 in) |
| Burst Pressure | 35 bar (507 psi) |
| Operating Temperature Range | -40°C to +150°C |
| Weight | 0.18 kg (0.4 lb) |
| OEM Reference | ZF 0501.209.162 |
Compatibility
This hose pipe is a direct fit for the ZF WG 251 series, which includes the WG180, WG200, and WG250 variants used in off-highway trucks, wheel loaders, and agricultural tractors. It also retrofits into certain WG 211 and WG 310 models where the cooler line routing matches the 410 mm length. Always verify the routing path against your existing TRANSMISSION HOUSING casting to confirm clearance around the CAP SCREW bosses.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Encloses planetary gear sets and valve body |
| 4646301201 | HOUSING | Supports clutch pack and piston assembly |
| 4646301166 | COVER | Seals the rear of the transmission case |
| 0636101051 | CAP SCREW | Secures housing flanges with M10 thread |
| 4646201018 | COVER SHEET | Protects internal components from debris ingress |
| 4646301277 | SCREEN SHEET | Filters particulate from hydraulic fluid |
| 4646201019 | COVER SHEET | Secondary sealing layer for oil pan |
| 0730365125 | TYPE PLATE | Displays transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing positioning |
| 0636010216 | HEXAGON SCREW | Fastens cover sheet to transmission body |
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