Eaton 2-Speed Tandem Axles; Eaton Interaxle Differential Lockout Operation - freightliner CENTURY CLASS S Driver Manual

Rear Axles
09/26/95
Fig. 9.3, Traction Control Differential Control
NOTE: The controlled traction differential can be
engaged at any speed, except during spinout.

Eaton 2-Speed Tandem Axles

Each axle of the 2-speed tandem contains a high
range single reduction gear set and a low range
double reduction gear set. The operator selects the
desired axle range by moving the range preselection
lever located on the shifter knob. See
A
B
01/19/95
A. High Range
Fig. 9.4, Range Preselection Lever
Dual Range 2-Speed Tandem Axle
Operation with Multispeed
Transmissions
NOTE: Refer to Chapter
detailed information on how to use the range
preselection lever.
On multispeed transmission applications, the 2-speed
axle should be used as a dual range. Use the low
range when operating off-highway or when starting
out with a heavy load on-highway. After the vehicle is
9.3
f350142
Fig. 9.4.
f260056a
B. Low Range
8, "Transmissions," for
moving on the highway, the axle can be shifted to
high range.
To shift the axle to the high range: Make sure the
interaxle differential lockout is disengaged; keep the
throttle pedal down; move the range preselection
lever to high; release the throttle pedal until the axle
shifts; then accelerate.
To shift the axle to the low range: Keep the throttle
pedal down; move the range preselection lever to
low; release and depress the throttle pedal quickly to
increase engine rpm. The axle will shift to low range.
NOTE: When parking the vehicle, put the axle in
the low range with the engine running. Engage
the clutch and transmission to be sure the axle
has completed the shift into the low range.
Some vehicle motion is required to ensure en-
gagement of the axle.
IMPORTANT: Refer to "Eaton Interaxle Differen-
tial Lockout Operation" for precautions that must
be taken when shifting axles in relation to the
interaxle differential lockout.
Eaton Interaxle Differential
Lockout Operation
Interaxle differential lockout systems include a lock-
out control valve (Fig. 9.2) located in the cab, and an
air-operated shift unit mounted on the forward rear
axle.
When the interaxle differential lockout control valve is
in the LOCK position, the interaxle differential is
locked out and the driveshaft becomes a solid con-
nection between the two axles. Power entering the
forward axle is also transmitted straight through to
the rear axle, so both axles turn together at the same
speed. The LOCK position should be used when ad-
ditional traction is needed.
CAUTION
Engage the lockout only when stopped or at slow
speeds and never when the wheels are spinning.
Do not operate the axles on dry pavement with
the lockout engaged for prolonged periods. Use
only when additional traction is needed under
adverse road conditions. Disengage the interaxle
differential lockout before shifting the axle to a
higher range.