The genius is in the gearing. The 6AP1700B features six forward gears, allowing for a wide gear spread. The lower gears are short and punchy to get the heavy bus rolling from a dead stop (the most energy-intensive part of driving), while the higher gears are tall and efficient for cruising. This ensures that the massive torque is available when needed, but doesn't drain the fuel tank when it isn't.
The primary retarder provides wear-free braking, which significantly reduces the load on the vehicle's service brakes and extends their lifespan. Helical Gearing:
The genius is in the gearing. The 6AP1700B features six forward gears, allowing for a wide gear spread. The lower gears are short and punchy to get the heavy bus rolling from a dead stop (the most energy-intensive part of driving), while the higher gears are tall and efficient for cruising. This ensures that the massive torque is available when needed, but doesn't drain the fuel tank when it isn't.
The primary retarder provides wear-free braking, which significantly reduces the load on the vehicle's service brakes and extends their lifespan. Helical Gearing: