While stopped facing uphill at a signalized intersection in a commercial truck equipped with an automatic transmission, which technique should the driver use to begin moving forward without rolling backward?
- AShift the transmission into neutral while holding the service brake, rev the engine to high RPM, and drop the gear selector directly into drive.
- Set the parking brake to hold the vehicle in place, apply throttle until the engine begins pulling forward, and then release the parking brake.Cevap
- CEngage the auxiliary engine retarder to lock the drive axle against backward rotation while pressing firmly on the accelerator pedal.
- DRelease the service brake completely and stomp the accelerator pedal to full throttle, accepting slight rollback until the torque converter engages.
Cevap
Set the parking brake to hold the vehicle in place, apply throttle until the engine begins pulling forward, and then release the parking brake.
According to standard commercial driver operating procedures, when stopped on a hill in a vehicle equipped with an automatic transmission, the driver must set the parking brake to hold the vehicle. The driver then applies engine power until forward pull is established and smoothly releases the parking brake to move forward without rolling back.
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Anahtar Kavram
Proper grade starting and acceleration technique for automatic transmission commercial vehicles to prevent rollback.
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