Overview
This genuine ZF 4681.084.026 4 BP 230 BASICPOWER Transmission Assembly represents a complete drop-in unit designed for medium-duty commercial and industrial drivetrains. As a fully assembled replacement, it integrates the valve body, clutch packs, and planetary gear sets into a single, pre-tested module. The SKU 4681.084.026 sits at the core of the transmission housing, serving as the primary power transfer mechanism between the torque converter and the output shaft. This assembly is engineered for the BP 210 and BP 230 series, offering a robust solution for restoring original shift quality and load-handling capacity in ZF-equipped vehicles.
Symptoms of Failure
When the ZF 4681.084.026 assembly begins to degrade, operators often notice delayed or harsh engagement when shifting from Neutral to Drive or Reverse. A second common indicator is intermittent gear slipping under load, particularly during uphill climbs or when towing, which manifests as a sudden RPM flare without corresponding acceleration. Third, visible fluid contamination—specifically metallic debris or a burnt odor in the transmission oil—signals internal wear within this assembly. Finally, erratic shift patterns or a complete loss of forward or reverse motion can occur, often accompanied by diagnostic trouble codes pointing to internal hydraulic pressure loss.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4681.084.026 |
| Assembly Type | Complete BASICPOWER Unit (4 BP 230) |
| Weight (approx.) | 68 kg (150 lbs) |
| Housing Material | High-strength aluminum alloy |
| Clutch Disc Material | Sintered bronze on steel |
| Overall Length | 485 mm |
| Input Spline Count | 21 |
| OEM Reference | ZF 0501.210.XXX series |
| Max Input Torque | 900 Nm (estimated) |
Compatibility
This assembly is specifically engineered for the ZF BP 210 and ZF BP 230 transmission series. It directly replaces units found in the following ZF model families:
- WG180 (late production variants with BP 230 internals)
- WG200 (select configurations using the 4-speed BASICPOWER layout)
- 4 BP 210 (all sub-variants, including those with integrated retarder)
- 4 BP 230 (standard and high-torque versions)
Always verify the transmission serial number and housing casting marks against the SKU 4681.084.026 before installation. This unit is not compatible with the HP 500 or Ecomat series without significant adapter modifications.
