Zf Ecolife 6ap1700b May 2026

The 6AP1700B is often chosen for repowering older buses/trucks originally equipped with:

Requirements for retrofit:

| Model | Torque (Nm) | Speeds | Retarder | Lock-up | Typical use | |-------|-------------|--------|----------|---------|--------------| | ZF 6AP1700B | 1700 | 6 | Yes | All gears | City bus, heavy truck | | ZF 6AP1400B | 1400 | 6 | Yes | All gears | Midibus, lighter trucks | | ZF 6AP2300B | 2300 | 6 | Yes | All gears | Heavy coach, 3-axle bus | | Allison 3000 | 1400-1700 | 6 | No (optional external) | All gears | Bus, truck (different shift feel) | | Voith DIWA.5 | 1800 | 4 (variable) | Yes (integral) | No converter (different principle) | City bus (different drive logic) | zf ecolife 6ap1700b

Key advantage over Allison: Lighter weight, integrated retarder standard.
Key advantage over Voith: More conventional planetary gear feel, better for mixed highway/city.

| Aspect | Benefit | |--------|---------| | Fuel efficiency | Up to 10% better than Ecomat series (due to early lock-up and reduced slip) | | Reliability | Designed for 500,000–700,000 km before major overhaul | | Driver comfort | Smooth, jerk-free shifts; integrated retarder eliminates driveline lash | | Safety | Retarder works automatically with brake pedal (blended braking) | | Maintenance | No periodic clutch adjustments; oil change interval up to 3 years with synthetic fluid | The 6AP1700B is often chosen for repowering older

| Parameter | Value | |-----------|-------| | Max. engine torque | ~1700 Nm (1254 lb-ft) | | Max. gross vehicle weight (GVW) | Up to 26–29 tonnes (articulated bus up to 44t) | | Number of speeds | 6 forward, 1 reverse | | Weight (dry, without oil) | ~280–310 kg (617–683 lb) | | Torque converter | With lock-up clutch in gears 1–6 | | Retarder | Integrated primary retarder (at converter housing) | | Oil capacity | ~12–15 liters (depending on pan) | | Oil type | ZF EcoFluid (e.g., EcoFluid M, LifeExtend) |

Note: Exact values vary slightly by OEM customization. Requirements for retrofit:

If you have ever been on a modern city bus and wondered, “Did we just move, or did the Earth tilt?” chances are you were riding on an Ecolife.

The "AP" in its name stands for Automatic Transmission for Public Transit, but the magic lies in the execution. Traditional automatic transmissions often suffer from "shift shock"—that nodding-dog motion where passengers jerk forward and backward as gears change. The 6AP1700B eliminates this.

It uses a highly sophisticated torque converter combined with a centrifugal pendulum absorber. In plain English: it dampens vibrations so effectively that the transition between gears becomes almost physically undetectable. For a driver stopping and starting every 200 meters, this smoothness isn't a luxury; it’s a necessity for passenger safety and comfort.