Overview
The ZF 0501.209.166 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 lubrication and cooling within the gear train. As an integral element of the transmission’s hydraulic circuit, the SKU 0501.209.166 maintains consistent oil flow to prevent thermal degradation and mechanical wear. When paired with a robust TRANSMISSION HOUSING, this hose pipe guarantees leak-free operation under high-pressure conditions, directly supporting the durability of the entire drivetrain.
Symptoms of Failure
- Hydraulic fluid seepage near the valve body: A cracked or swollen 0501.209.166 hose pipe often produces slow oil drips, leading to low fluid levels and eventual transmission overheating.
- Delayed gear engagement or harsh shifting: When the hose pipe collapses internally, oil pressure drops, causing erratic clutch pack actuation and noticeable shift lag.
- Whining or groaning noise during acceleration: Restricted fluid flow through a degraded hose pipe creates cavitation, generating audible distress from the pump and valve body.
- Burning odor from transmission fluid: A failing hose pipe reduces cooling circulation, allowing the oil to overheat and emit a distinct burnt smell during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.209.166 |
| OEM Reference | ZF 0501.209.166 |
| Material | Reinforced synthetic rubber with braided textile |
| Inner Diameter | 12.5 mm (0.49 in) |
| Outer Diameter | 19.0 mm (0.75 in) |
| Length | 410 mm (16.1 in) |
| Weight | 0.18 kg (0.40 lb) |
| Operating Pressure | Up to 18 bar (261 psi) |
| Temperature Range | -40°C to +150°C (-40°F to +302°F) |
Compatibility
This ZF 0501.209.166 HOSE PIPE is primarily designed for the WG 251 Series transmission, but it also fits select models within the WG180, WG200, and WG240 families that share the same hydraulic routing architecture. It is commonly used in heavy-duty commercial vehicles, construction equipment, and agricultural machinery where the WG251 gearbox is installed. For proper sealing, always pair this hose pipe with a new CAP SCREW and verify the condition of the HOUSING and COVER during replacement to avoid contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Encloses and supports all internal gear and clutch assemblies |
| 4646301201 | HOUSING | Provides mounting surface for valve body and hydraulic circuits |
| 4646301166 | COVER | Seals the transmission case and prevents fluid leakage |
| 0636101051 | CAP SCREW | Fastens hose pipe and housing components with precise torque |
| 4646201018 | COVER SHEET | Protects internal gaskets from debris and oil splash |
| 4646301277 | SCREEN SHEET | Filters hydraulic fluid before it enters the pump intake |
| 4646201019 | COVER SHEET | Secondary shield for high-pressure oil galleries |
| 0730365125 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Anchors housing covers with anti-rotation feature |
| 0636010216 | HEXAGON SCREW | Secures valve body and filter assemblies |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
