Overview
The ZF 0501.223.099 HOSE PIPE is a critical fluid transfer component engineered specifically for the lubrication and cooling circuits within the WG 251, WG 260, and WG 310 series transmissions. This OEM genuine part ensures precise oil routing between the valve body and the cooler circuit, maintaining consistent hydraulic pressure and thermal regulation. The SKU 0501.223.099 is manufactured to ZF’s exacting tolerances, featuring a reinforced construction that resists degradation from high-temperature transmission fluid. When installed alongside the TRANSMISSION HOUSING, this hose pipe creates a sealed pathway that prevents pressure loss during gear shifts. Its placement in the upper valve body assembly makes it essential for maintaining the integrity of the entire hydraulic network.
Symptoms of Failure
- External transmission fluid seepage near the valve body: A cracked or swollen 0501.223.099 hose pipe often produces slow, persistent oil drips that accumulate on the HOUSING exterior, leading to low fluid levels and eventual gear engagement delays.
- Erratic shift timing under load: When this hose pipe collapses internally, it restricts oil flow to the clutch packs, causing harsh or delayed shifts—especially when towing or climbing grades.
- Overheating transmission with warning lamp activation: A restricted hose pipe disrupts cooler circulation, causing the transmission to run 15–20°F hotter than normal, often triggering dash warnings.
- Whining or cavitation noise from the pump: Air ingestion through a cracked hose pipe creates a high-pitched whine as the pump struggles to maintain prime, particularly at cold startup.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0501.223.099 |
| Material | Reinforced synthetic rubber with textile braid |
| Inside Diameter | 12.7 mm (0.5 in) |
| Outside Diameter | 19.0 mm (0.75 in) |
| Overall Length | 410 mm (16.1 in) |
| Weight | 0.18 kg (0.4 lbs) |
| OEM Reference | ZF 0501.223.099 |
| Max Operating Pressure | 12 bar (174 psi) |
| Temperature Range | -40°C to +150°C |
Compatibility
This genuine ZF hose pipe is validated for the following transmission models: WG180, WG200, WG251, WG260, WG310. It directly replaces the factory-installed line in the WG 251 Series, WG 260 Series, and WG 310 Series. For proper installation, ensure the COVER is removed to access the retaining clips, and use a new CAP SCREW to secure the fitting to the housing. Always inspect the mating surfaces on the transmission housing for corrosion before reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4646301201 | HOUSING | Intermediate housing for oil pump and filter assembly |
| 4646301166 | COVER | Seals the valve body access port |
| 0636101051 | CAP SCREW | Fastens hose pipe fitting to housing |
| 4646201018 | COVER SHEET | Protective shield for clutch pack access |
| 4646301277 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4646201019 | COVER SHEET | Secondary cover for oil channel sealing |
| 0730365125 | TYPE PLATE | Identification tag with transmission serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing positioning |
| 0636010216 | HEXAGON SCREW | Fastener for cover sheet attachment |
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