: Controls transmission fluid temperatures during continuous driving.
While the 6AP 1700B is a staple in existing fleets, ZF has introduced the zf ecolife 6ap1700b
The biggest headache for any fleet is the "drain and fill." The 6AP1700B runs on ZF's top-tier (or compatible synthetics). Under standard city bus duty, ZF certifies an oil change interval of 300,000 km or 5 years , whichever comes first. The transmission relies on an optimized hydrodynamic torque
The transmission relies on an optimized hydrodynamic torque converter paired with a lock-up clutch. The lock-up clutch engages early in the acceleration phase, establishing a direct mechanical connection between the engine and the planetary gearset. This eliminates the hydraulic slippage inherent to torque converters, maximizing energy transfer and drastically lowering fuel consumption during low-speed transit operations. Planetary Gearset Configuration Planetary Gearset Configuration 6 forward speeds, 1 reverse
6 forward speeds, 1 reverse speed
The is a specialized six-speed automatic transmission designed primarily for heavy-duty city and intercity bus applications. Engineered by ZF Friedrichshafen AG , this model serves as a mid-to-high range variant within the EcoLife series, bridging the gap between standard urban transit and demanding long-distance coach requirements. Core Technical Specifications
It handles a maximum input torque of 1,700 Nm .
