Overview
The ZF 4646.121.106 TUBO DE ACEITE (Oil Tube) is a precision-engineered hydraulic conduit designed for the WG 250, WG 260, and WG 310 transmission series. This OEM subassembly delivers pressurized lubrication oil from the pump to the rotating clutch packs and planetary gear sets within the transmission housing. As a critical flow path component, the 4646.121.106 ensures consistent oil volume and pressure to prevent thermal damage during heavy-duty construction machinery operation. This part number directly replaces the original factory tube assembly, maintaining the exact flow dynamics required for ZF’s countershaft architecture.
Symptoms of Failure
- Oil leaks at the transmission housing interface: Cracks or fatigue in the tube body cause fluid seepage around the TRANSMISSION HOUSING mating surface, leaving visible puddles under the equipment.
- Erratic gear engagement under load: A restricted or collapsed tube reduces clutch feed pressure, leading to delayed shifts or slipping when the machine is under heavy strain.
- Overheating transmission fluid: Insufficient oil flow due to a blocked or deformed tube causes rapid temperature spikes, often triggering warning lights on the dashboard.
- Metallic debris in the oil pan: Starvation of lubrication to the COUNTERSHAFT bearings generates fine metal particles, detectable during routine fluid changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.121.106 |
| Material | Seamless drawn steel with zinc-nickel plating |
| Overall Length | 285 mm |
| Tube Outer Diameter | 12 mm |
| Wall Thickness | 1.5 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 4646.121.106 |
| Sealing Method | Compression fit with O-ring groove |
Compatibility
This oil tube is engineered for ZF’s WG-series powershift transmissions used in wheel loaders, graders, and material handlers. Direct fitment includes the WG 250, WG 260, and WG 310 models. It also serves as a service replacement for earlier WG 180 and WG 200 variants when paired with the updated HOUSING assembly. Always verify the tube routing against the existing POT (pressure oil test port) location to ensure correct alignment. Installation requires four 螺栓 (bolts) torqued to 25 Nm.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101179 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4646301345 | HOUSING | Rear cover housing for clutch drum assembly |
| 0636115293 | 螺栓 | M8 flange bolt for tube bracket retention |
| 4646201003 | POT | Pressure test port for clutch circuit diagnostics |
| 0736300232 | 螺栓 | M10 hex bolt for housing-to-tube clamp |
| 4475280208 | SCREW PLUG | Sealing plug for unused oil gallery ports |
| 0634316523 | O-RING | Viton seal for tube-to-housing connection |
| 4646108013 | COUNTERSHAFT | Intermediate shaft transferring torque between gears |
| 4646138401 | FILTER | Suction strainer for transmission oil pump |
| 0899317830 | ADAPTER | Converter-to-pump mounting adapter plate |
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