In tractor/trailer combinations where the trailer parks on spring brakes, the park brakes when applied stop the provision of air to the semi-trailer from the tractor. The Sidelifter requires an air supply to retract the crane module locking pins and operate the engine stop and speed control. There is normally enough air stored in the trailer system when it is parked to provide this for a reasonable number of applications. However it is essential that the Sidelifter brake system and piping are always free from air leaks, which waste the stored air. On systems where parking is performed by applying air pressure to the service lines this does not apply. |
Pre-heating the engine is only necessary when the engine is cold. |