ZF 0501.209.165 HOSE PIPE for WG251 | OEM Genuine Part
Engineered for the demanding environments of off-highway machinery, the ZF 0501.209.165 hose pipe represents a critical fluid conveyance component within the WG 251 transmission series. This OEM genuine part is precision-manufactured to withstand sustained hydraulic pressures, thermal cycling, and abrasive contaminants that degrade aftermarket alternatives. Unlike standard rubber assemblies, this hose pipe incorporates a reinforced synthetic core with a braided textile layer, ensuring minimal volumetric expansion under load—a key factor for maintaining consistent clutch modulation and lubrication flow in heavy-duty applications.
Critical Performance Characteristics
- Pressure Integrity: Rated for continuous operation up to 25 bar with a 4:1 burst safety factor, validated through ZF’s proprietary pulse testing protocols.
- Thermal Resilience: Functions reliably across -40°C to +135°C, with a specialized nitrile outer layer resisting oil permeation and ozone cracking.
- Fluid Compatibility: Fully compatible with ZF TE-ML 03, 05, and 09 specification oils, as well as Dexron III and Caterpillar TO-4 fluids.
- Dimensional Precision: Formed with a 180° bend radius of 85mm and a 19.05mm (3/4”) internal diameter, matching the exact WG251 routing geometry to eliminate kinking.
Compatibility Notes
This hose pipe is exclusively validated for the ZF WG 251 series—specifically models with serial numbers beginning with 251.0xx and 251.1xx. It serves as the primary pressure line between the main control valve and the torque converter lock-up circuit. Do not substitute on WG 200 or WG 310 series transmissions due to differing port thread configurations (M22x1.5 vs. M24x1.5). For dual-path installations, always replace both primary and secondary hoses simultaneously to prevent asymmetrical flow resistance.
| Parameter | Specification |
|---|---|
| Working Pressure | 25 bar (362 psi) |
| Burst Pressure | 100 bar (1,450 psi) |
| Temperature Range | -40°C to +135°C |
| Inner Diameter | 19.05 mm (3/4”) |
| Length (End-to-End) | 520 mm ±3 mm |
| End Fittings | Swivel 90° M22x1.5 |
Every unit ships with a laser-etched ZF part number and batch traceability code, guaranteeing it meets the same quality standards as the original transmission assembly. For fleet operators, this eliminates the risk of premature hose fatigue and unplanned downtime in excavators, wheel loaders, or drilling rigs.
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