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 Fig..
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High Range
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Low Range
Fig. 1, Range Preselection Lever
Dual Range 2-Speed Tandem Axle Operation with Multispeed Transmissions
Note: See Freightliner SmartShift Shift Control, "Transmissions," for 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 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 engagement of the axle.
Important: Refer to "Eaton Interaxle Differential Lockout Operation" for precautions that must be taken when shifting axles in relation to the interaxle differential lockout.