Overview
The ZF 4681.024.002 4 BP 190 BASICPOWER Transmission Assembly is a complete, ready-to-install unit engineered for medium-duty commercial and industrial drivetrains. This assembly integrates the hydraulic control module, planetary gear set, and torque converter housing into a single, pre-assembled package. As a core component of the BP 190 series, it manages power distribution from the engine to the driveline, ensuring smooth gear engagement under load. The SKU 4681.024.002 is specifically calibrated for vehicles requiring a robust 4-speed forward and 1-speed reverse configuration, making it a direct replacement for worn or failed units in refuse trucks, fire apparatus, and construction equipment.
Symptoms of Failure
When the ZF 4681.024.002 assembly begins to degrade, operators will notice distinct operational issues. Recognizing these signs early can prevent secondary damage to the torque converter or differential.
- Delayed engagement or “flare shifting” between gears: A worn clutch pack or valve body within the assembly causes a noticeable lag when shifting from Neutral to Drive or Reverse, often accompanied by a momentary engine RPM spike.
- External oil seepage at the bell housing or output flange: Degraded seals and gaskets in the 4681.024.002 unit lead to fluid loss, visible as drips or wet spots on the transmission pan or bell housing, which can escalate to major leaks under load.
- Harsh, jarring upshifts or downshifts: Internal hydraulic pressure irregularities, often from a failing accumulator or worn spool valves, produce abrupt gear changes that can be felt as a violent jolt through the chassis.
- Overheating and burnt fluid odor: Slipping clutches or a failing torque converter stator generate excessive heat, causing the transmission fluid to darken and emit a distinct burnt smell, indicating imminent internal failure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4681.024.002 |
| Assembly Type | Complete Transmission Unit (4 BP 190 BASICPOWER) |
| Dry Weight (approx.) | 195 kg (430 lbs) |
| Overall Length (bell to output) | 685 mm (27.0 in) |
| Housing Material | Aluminum alloy (A356-T6) with cast iron clutch drum |
| Torque Converter Diameter | 340 mm (13.4 in) |
| OEM Reference | ZF 4681.024.002 / BP 190 Series |
| Fluid Capacity (assembly) | 14.5 liters (15.3 quarts) of ZF LifeguardFluid 8 |
Compatibility
This complete unit is designed for the ZF BP 190 series, but its mounting pattern and gear ratios also allow direct interchange with select models in the BP 210 and BP 230 families. Verify bell housing bolt pattern and output yoke spline count before installation. Compatible transmission series include:
- ZF BP 190 Series: 4 BP 190, 5 BP 190 (direct fit)
- ZF BP 210 Series: 4 BP 210, 5 BP 210 (with adapter plate modification)
- ZF BP 230 Series: 4 BP 230, 5 BP 230 (requires output flange swap)
- ZF WG180 / WG200 Series: Not directly compatible without significant hydraulic reconfiguration; consult factory for retrofit kits.
