Modern disc brakes wear quickly in stop/start traffic, leading to dust and downtime. The 6AP1700B’s integrated retarder provides 90% of the braking force for "feathering" stops. At 2,800 Nm of braking torque, it brings a 19-ton bus down to walking speed using hydraulic friction inside the transmission without touching the service brakes.
: Includes a high-performance primary retarder (Intarder) as a standard auxiliary brake, which reduces wear on the main service brakes during downhill driving or frequent stops [5.1, 5.3, 5.4].
compared to older generations. By shutting down the engine during long idle periods at bus stops or traffic lights, it reduces both emissions and noise pollution in crowded city centers. Built for the Long Haul
Utilizes a reinforced dual cooling system with a corrosion-resistant stainless steel heat exchanger, designed to prevent overheating during demanding uphill or stop-and-go operations. zf ecolife 6ap1700b
: The transmission uses advanced sensors to detect the road's gradient, automatically adjusting shift points to save fuel on flat terrain or provide more power on inclines.
Features corrosion-resistant and pressure-resistant stainless steel components.
: Kinetic energy captured during braking is converted into fluid heat, which is quickly dissipated through an integrated dual cooling system. Modern disc brakes wear quickly in stop/start traffic,
To ensure the long service life that the 6AP1700B is known for, rigorous adherence to the ZF TE-ML 20 lubricant list is non-negotiable. The transmission is highly sensitive to fluid quality, and the use of non-approved lubricants can lead to unpredictable behavior and internal damage. ZF explicitly prohibits the use of any aftermarket additives, accepting no liability for resulting failures.
The is an excellent choice for transit operators seeking a balance of durability, fuel economy, and safety through its integrated retarder. With proper maintenance (especially oil/filter changes and cooling system integrity), it routinely achieves 600,000+ km in city bus service.
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 : Includes a high-performance primary retarder (Intarder) as
Safety is paramount in heavy vehicles. The 6AP1700B features a high-performance primary retarder that provides wear-free braking, significantly extending the life of the service brakes even at low speeds. Dual Cooling System:
: Uses intelligent, topography-dependent shifting software that automatically adjusts gear selection based on the road gradient and vehicle load to maximize fuel efficiency. Thermal Management
Correct oil level is critical for the EcoLife transmission. Insufficient oil leads to mechanical malfunctions and damage, while overfilling causes overheating.
: Genuine replacement units and components like the Electronic Control Unit (ECU) can be sourced through the ZF Aftermarket Catalog .