Overview
The ZF 4660.231.015 OIL TUBE is a critical hydraulic conduit engineered specifically for the WG 98 Series transmission. This OEM genuine part directs pressurized lubricating fluid from the pump to the rotating clutch packs and planetary gear sets, ensuring consistent oil flow under high torque loads. Positioned within the lower valve body cavity, the SKU 4660.231.015 interfaces directly with the TRANSMISSION HOUSING and the HOUSING II to maintain a sealed oil circuit. Without this precision-formed tube, the transmission cannot sustain hydraulic pressure, leading to immediate operational failure.
Symptoms of Failure
- External oil leaks near the bell housing: Cracks or corrosion on the 4660.231.015 tube cause fluid to weep past the O-RING seals, leaving puddles under the vehicle.
- Delayed or harsh gear engagement: A restricted oil tube starves the clutches of lubrication, causing slipping during 1-2 or 2-3 upshifts under load.
- Overheating transmission fluid: Reduced flow through a damaged tube increases friction in the planetary gears, triggering thermal warnings on the dash.
- Whining or groaning noise from the pump: Air ingestion through a fractured oil tube creates cavitation, audible as a high-pitched whine during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.231.015 |
| Material | Seamless drawn steel with zinc-nickel plating |
| Overall Length | 215 mm ± 1.5 mm |
| Tube Outer Diameter | 12.7 mm (0.5 inch) |
| Wall Thickness | 1.5 mm |
| Weight | 0.18 kg (0.40 lbs) |
| OEM Reference | ZF 4660.231.015 |
| Sealing Surface | Ground finish for O-ring compatibility |
Compatibility
This oil tube is factory-specified for the ZF WG 98 Series, including the WG98, WG180, and WG200 models. It also fits select variants of the WG150 and WG250 transmissions where the hydraulic circuit uses a 12.7 mm tube. Always verify the presence of the CYLINDRICAL PIN alignment feature in your housing before installation. The tube is not compatible with the older WG 80 Series or the newer Ecolife models without adapter kits.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing that encloses the oil tube and gear sets |
| 4660301056 | HOUSING II | Intermediate housing that supports the oil tube routing |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise tube positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model verification |
| 0750100022 | SCREW PLUG | Seals the oil gallery test port |
| 4660221031 | SUCTION TUBE | Draws oil from the pan to the pump |
| 0634100317 | O-RING | Seals the tube-to-housing connection |
| 0636103273 | CAP SCREW | Fastens the tube bracket to the housing |
| 0634306311 | O-RING | Secondary seal for the suction tube interface |
| 4660321029 | FIXING PLATE | Retains the oil tube against vibration |
