Either type of trombone Sidelifter must be coupled to a tractor unit during extending or retracting.

NEVER attempt to extend or retract the chassis when the Sidelifter is laden.

1. On the remote control, select Low Speed and Arms Mode.
2. On the chassis, push in and hold the trombone lock release button located in the clear box at the landing legs (see A).
3. Move the lever (B ) down to extend OR up to retract the chassis.

Once the mechanism starts to move, release the trombone lock release button (A), but keep holding the lever (B) as you walk beside the unit. Once released the lock will self reset so the locks will automatically lock when they get to the next lock position.

1. Unlock the trombone locks with the Trombone lock key located on the control panel at the front of the rear half of the trailer (C). The key has two positions UNLOCK and RESET.
2. Apply the trailer brake in the tractor unit and slowly drive forward for extension, or reverse for retraction. The trombone locks will automatically reset as the chassis moves and will self lock when in correct position.

If the tractor unit is not equipped with a "trailer brake only" option, disconnect the air lines between the tractor unit and the trailer so that the spring brakes will apply automatically and hold the rear half of the chassis in place and allow the chassis to extend or retract.

Driving too fast when extending or retracting the unit can damage the locks. Always drive very slowly until the locks engage before increasing driving speed.