When adjusted, the backrest inclination should
allow the driver to reach the steering wheel with
angled arms.
2.
Back Support: There are two switches that
control the back areas of the seat. Making
changes to a driver’s sitting position from time to
time helps prevent driver fatigue and improves
posture.
2.1
Lumbar Support:
Press the forward button to inflate the
cushion highlighted in
Fig. 5.22 to
increase support at the lower back. This
moves the driver’s spine into a double S
shape and decreases pressure on the
spine.
2.2
Upper Back Support:
Press the back button to inflate the
cushion highlighted in
Fig. 5.23 to
increase support at the mid-back region.
This can help prevent the driver from
sitting in a slouched, hunched, or hollow-
back position.
3.
Height Adjustment: Pull or push the handle to
adjust the seat height.
Adjust the seat so the driver’s feet can move
each pedal through a full range of motion without
fully stretching out the driver’s legs or using
force.
4.
Damper Adjustment: Move the lever down to
increase damping on rough roads, or up to
decrease damping on flat roads.
The damper protects the driver’s spine by
absorbing vertical vibrations and shocks. It
should be adjusted down far enough that the
driver’s feet never lose contact with the pedals.
In general, heavier drivers will not need to adjust
the lever up.
5.
Forward/Back Isolator: Rotate the isolator lever
to the left to lock the isolator, or to the right to
allow horizontal movement.
Damping horizontal shocks can be helpful with
driving off-road or pulling a tank trailer.
6.
Seat Extension: Pull the lever to move the seat
cushion forwards or back. The cushion moves up
to 2-3/8 inches (60 mm) in 3/8-inch (10-mm)
increments. Releasing the lever locks the
cushion in place.
Adjust the length of the seat cushion until there
is space for three fingers between the cushion’s
front edge and the back the driver’s knee. This
helps to help improve circulation in the lower
legs.
7.
Forward/Back Slide: Pull the lever to unlock the
seat and slide it forward or backward. Release
the lever to lock the seat in position.
f91083412/01/2021
Fig. 5.22, Lower Back Support
f91083512/01/2021
Fig. 5.23, Upper Back Support
Cab Features
5.11
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