Overview
The ZF 4681.084.034 4 BP 230 BASICPOWER Transmission Assembly is a complete, factory-grade replacement unit designed for heavy-duty commercial vehicle applications. This assembly integrates the hydraulic control unit, clutch packs, and planetary gear sets into a single, pre-assembled module, serving as the core power transfer component within the BP 230 series. As a complete unit, it eliminates the need for piecemeal rebuilding, reducing downtime for fleet operators and repair shops. The SKU 4681.084.034 specifically denotes a 4-speed BASICPOWER variant, optimized for mid-range torque output and durability in urban and regional transport scenarios.
Symptoms of Failure
When the ZF 4681.084.034 assembly begins to degrade, operators often notice distinct operational issues. Identifying these signs early can prevent catastrophic drivetrain damage.
- Delayed or harsh gear engagement: A worn valve body or clutch pack within the assembly causes a noticeable lag when shifting from Neutral to Drive or Reverse, often accompanied by a jarring thud.
- Intermittent gear slipping under load: During uphill climbs or heavy acceleration, the transmission may momentarily lose power delivery, with engine RPMs rising without a corresponding increase in vehicle speed.
- Fluid contamination with metallic debris: Internal wear from bearings or clutch friction material produces fine metallic particles in the transmission fluid, visible during a drain or as a dark, gritty residue on the dipstick.
- Persistent fluid leaks at the bell housing: A failing front pump seal or cracked housing in the assembly leads to oil weeping from the joint between the transmission and engine, often mistaken for a rear main seal failure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4681.084.034 |
| Assembly Type | Complete Unit (4 BP 230 BASICPOWER) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Housing Material | Aluminum Alloy (A356-T6) |
| Overall Length (bell to tail) | 720 mm (28.3 in) |
| Max Input Torque Capacity | 900 Nm (664 lb-ft) |
| Fluid Capacity (assembly only) | 12.5 liters (3.3 gal) |
| OEM Reference | ZF 4681.084.034 (Direct Fit) |
Compatibility
This complete unit is engineered for the ZF BP 230 Series and its predecessor, the BP 210 Series. It is a direct replacement for transmissions originally equipped with the BASICPOWER control logic. While primarily designed for the 4-speed variant, it is compatible with the following ZF transmission models when used in identical torque-rating applications:
- ZF WG180 (late production models with BP 230 internals)
- ZF WG200 (with BASICPOWER valve body adaptation)
- ZF BP 230 (all sub-variants: 4 BP 230, 6 BP 230)
- ZF BP 210 (as a performance upgrade, requires bell housing check)
Note: Always verify the bell housing bolt pattern and torque converter pilot diameter against your specific vehicle chassis. This assembly does not include the torque converter or external wiring harness.
