Overview
The ZF 4660.231.016 TUBE for WG98 is a precision-engineered fluid conduit designed to route pressurized oil within the transmission’s hydraulic control system. This OEM genuine part, identified by SKU 4660.231.016, sits between the valve body and the clutch pack assembly, ensuring consistent lubrication and cooling flow. Manufactured to exacting ZF tolerances, this tube prevents pressure drops that can compromise shift quality in heavy-duty WG98 series transmissions. For optimal sealing integrity, this component is frequently replaced alongside the 4950101004 HOUSING and the 4950301018 HOUSING I, which form the primary structural enclosure for the tube assembly.
Symptoms of Failure
- External oil seepage at tube junctions: A worn 4660.231.016 tube often develops micro-cracks near the crimped ends, leading to visible ATF drips under the transmission bell housing.
- Erratic gear engagement under load: When this tube loses internal pressure integrity, the WG98 may exhibit delayed or harsh shifting, particularly between 3rd and 4th gears during uphill hauling.
- Low line pressure warnings on diagnostic tools: A compromised tube can cause the transmission control unit to register persistent low-pressure codes (e.g., P0841) even after replacing the 0734309932 SHAFT SEAL.
- Overheating in stop-and-go operation: Restricted fluid flow through a deformed tube reduces cooler circulation, triggering thermal alarms in vocational trucks operating in urban environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4660.231.016 |
| Material | Seamless drawn steel, zinc-nickel plated |
| Overall Length | 312 mm (12.28 in) |
| Tube Outer Diameter | 12.7 mm (0.50 in) |
| Wall Thickness | 1.5 mm (0.059 in) |
| Weight | 0.18 kg (0.40 lbs) |
| OEM Reference | ZF 4660.231.016 |
Compatibility
This tube is engineered exclusively for the ZF WG98 series, which includes the WG98, WG98C, and WG98E variants found in medium-duty trucks and buses. While the WG98 shares its hydraulic architecture with the WG180 and WG200 models, the 4660.231.016 tube is dimensionally unique to the WG98’s shorter clutch housing. For WG180 or WG200 applications, use the 4660221039 TUBE instead. Always verify the transmission serial number against ZF’s parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4950101004 | HOUSING | Encloses the tube and valve body assembly |
| 4950301018 | HOUSING I | Secondary housing for oil distribution channels |
| 0734309932 | SHAFT SEAL | Prevents fluid leakage at rotating shaft interfaces |
| 4660101023 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4660301058 | HOUSING | Intermediate housing for clutch pack support |
| 0631306174 | CYLINDRICAL PIN | Aligns housing components during assembly |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports in the housing |
| 4660301009 | BRACKET | Secures wiring harness away from hot tube surfaces |
| 4660221039 | TUBE | Alternate tube for WG180/WG200 transmissions |
| 0636103274 | CAP SCREW | Fastens the tube bracket to the housing |
