General Information

Unless otherwise noted, all seat adjustments should be made while seated and before the engine is started.

Due to the maximum adjustability of mid- and high-back air suspension seats, it is possible to combine the seat back recline adjustment and the seat slide adjustment so that the seat back contacts the backwall. It is the responsibility of the driver to adjust the seat to prevent damage to the seat and the cab interior.

Back Cushion Tilt

Lumbar Support

Isolator Feature

Height Adjustment

Bottom Cushion Angle (fore and aft cushion height)

Fore and Aft Seat Adjustment (seat track adjustment)

Seat Tilt

Upper Back Cushion

Fig. 1, Seat Adjustments

Seat Adjustments

The following is a description of adjustments that can be made to various Freightliner-installed seats. Not all seats have all of the adjustments listed below. See Fig..

1. Back Cushion Tilt: This adjustment enables the back cushion to pivot forward or backward.

2. Lumbar Support: Lumbar support changes the shape of the seat back to give more or less support to the occupant's lumbar (lower back) area. This adjustment is either mechanical or air controlled, depending on make and model of the seat.

3. Isolator: This feature (also referred to as back-slap isolator or Chugger-Snubber®) reduces the amount of road shock by isolating the occupant from the motion of the vehicle, and allowing the upper seat to move in a simple pendulum motion. A lockout feature is used whenever the isolator is not desired.

4. Height Adjustment: The entire seat moves up or down when adjusting the height. The adjustment is either manually or air controlled, depending on the make of the seat.

5. Bottom Cushion Angle or Fore and Aft Bottom Cushion Height: This feature enables the occupant to raise or lower the front or back of the bottom cushion. This adjustment is easier to perform when all weight is removed from the seat.

6. Fore and Aft Seat or Seat Track Adjustment: The entire seat moves forward or backward when this adjustment is made.

7. Seat Tilt: When this adjustment is made, the seat assembly (back and bottom cushions) tilts forward or backward.

8. Upper Back Cushion Adjustment: When this adjustment is made, the upper back cushion changes angle to provide upper back support.

9. Weight Adjustment: On those seats with weight adjustment, the feature is fully automatic. When you sit on the seat, a leveling valve places you in the center of the ride zone. Additional adjustments are possible by using the height adjustment feature.