The 6AP1700B is not a "one size fits all" transmission. It is torque-matched for specific engine outputs. You will typically find it bolted to:
compared to its predecessors. This makes it a highly economical choice for fleet operators aiming to reduce their carbon footprint and operating expenses. 2. Superior Driving Comfort and Smooth Shifts
The ZF EcoLife 6AP1700B is a fully automatic, six-speed transmission designed specifically for , intercity coaches , and heavy commercial vehicles with a gross vehicle weight (GVW) between 12 and 26 tons. It is the successor to the iconic Ecomat series, offering improved fuel efficiency, lower noise levels, and enhanced electronic control.
Approximately 376 kg, offering a highly competitive power-to-weight ratio.
| Parameter | Value | |-----------|-------| | Model | 6AP1700B | | Gear ratios | 6 forward, 1 reverse | | Max input torque | 1700 Nm | | Max input speed | 2800 rpm (diesel) | | Weight (dry) | ~290–310 kg (including retarder, oil, converter) | | Oil capacity (initial fill) | ~12–14 liters (ZF Ecofluid M or equivalent) | | Oil change interval | 60,000 km or 2 years (depending on duty cycle) | | Retarder type | Integrated primary retarder (wear-free) | | Retarder braking torque | Up to 2300 Nm at the transmission input | | TCM (control unit) | Integrated TCU (ZF-Tronic) or CAN-controlled external |
Urban bus operations generate immense thermal stress due to constant braking and acceleration. The 6AP1700B features an integrated dual-cooling system. A high-capacity oil-to-water heat exchanger connects directly to the vehicle’s engine cooling circuit. This design keeps transmission fluid temperatures within the optimum operating window, extending oil life and protecting internal clutches from thermal degradation. Heavy-Duty Primary Retarder