Overview
The ZF 4681.086.015 6 BP 230 BASICPOWER Transmission Assembly represents a complete, factory-grade replacement unit engineered for medium-duty commercial drivetrains. As a fully assembled drop-in solution, this SKU 4681.086.015 integrates the hydraulic control unit, planetary gear sets, and the torque converter housing into a single, pre-tested module. It is specifically designed to restore the full power transfer capability in vehicles operating under the BP 210 and BP 230 series classifications. This assembly eliminates the need for piecemeal component replacement, ensuring that the internal clutch packs and valve body operate with synchronized precision from the moment of installation.
Symptoms of Failure
When the ZF 4681.086.015 unit begins to degrade, operators often notice distinct operational anomalies. Recognizing these signs early can prevent secondary damage to the driveline.
- Delayed or harsh engagement when shifting from Neutral to Drive: A worn internal clutch pack or a failing torque converter stator within the assembly causes a noticeable lag or a jarring “clunk” during gear selection.
- Intermittent gear slipping under load: If the transmission unexpectedly revs higher than normal while climbing a grade or carrying a heavy payload, the hydraulic pressure within the 6 BP 230 assembly is likely compromised.
- Dark, burnt-smelling transmission fluid with metallic particles: Internal wear of the planetary gears or bushings generates debris. This contamination accelerates the failure of the valve body and seals.
- Fluid seepage from the bell housing or output shaft seal area: Degraded O-rings and gaskets within the complete unit lead to visible drips, often mistaken for engine oil leaks.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4681.086.015 |
| Assembly Type | Complete Unit (6-speed) |
| Series Classification | BP 210 / BP 230 BASICPOWER |
| Dry Weight (Estimated) | 98 kg (216 lbs) |
| Housing Material | High-Strength Aluminum Alloy |
| Torque Capacity (Estimated) | 600 Nm (442 lb-ft) |
| Fluid Capacity | Approx. 8.5 Liters (ZF LifeguardFluid 8) |
| Overall Length (Bell to Tail) | 685 mm (27.0 in) |
Compatibility
This complete assembly is a direct replacement for specific ZF transmission models that share the BP 210 and BP 230 architecture. It is primarily engineered for the ZF WG180 and ZF WG200 series transmissions found in municipal buses, refuse trucks, and medium-duty construction vehicles. Additionally, it is compatible with the ZF 6HP 210 and ZF 6HP 230 variants used in agricultural tractors and material handlers. Always verify the bell housing bolt pattern and the output flange configuration against your existing unit before installation. For cross-referencing, this SKU supersedes earlier 4681.086.010 and 4681.086.012 revisions.
Installation Notes
Prior to mounting the 4681.086.015, inspect the torque converter pilot bore and the flexplate for runout. The unit ships with a pre-filled oil charge; however, the final fluid level must be checked after the engine reaches operating temperature. Use only ZF-approved synthetic transmission fluid to maintain the warranty and ensure the BASICPOWER hydraulic logic functions correctly.
