Dual Range Driving ...............................................................................1
Downshift Axle for More Power .............................................................1
Important Procedures to Remember .....................................................3
Dual Range Tandem Axle Features ........................................................4
Dual Range Axle Overview .....................................................................5
Dual Range Driving
Dual Range Driving
From off-highway starting to rolling on the highway
(with multispeed or automatic transmissions)
1.Disengage the lockout . . . place the lockout selector valve in the
UNLOCK position.
2.Move axle selector valve to LOW range. Shift transmission to start
truck.
3.Driving off-highway . . . to keep the truck rolling on rough terrain and
secondary roads, keep axle in LOW range and shift transmission to
maintain desired road speed.
4.Driving on highway . . . with truck rolling in LOW axle range and
approaching a highway . . . shift axle to HIGH range as follows:
•make sure lockout is disengaged.
•keep accelerator down and move axle valve lever to HIGH range.
•keep driving with accelerator down until you want the axle to
shift,
•then release accelerator until axle has shifted.
You are now in HIGH axle range on the highway. Shift the transmission to
obtain desired cruising speed.
Downshift Axle for More Power
•Keep accelerator down and move axle selector valve lever to LOW.
•Keep driving with accelerator down until you want to downshift the
axle . . . then release and depress accelerator pedal quickly to
increase engine rpm . . . axle will shift to LOW range.
1
Dual Range Driving
With lockout disengaged . . . axle can be
Dana Lockout
Selector Valve
UNLOCK LOCK
Inter-axle Differential
Dana Dual Range
Tandem Selector Valve
operated in LOW or HIGH range.
For startability and off-highway driving,
keep axle in LOW range.
HIGH
Range
Dana Dual Range
Tandem Selector Valve
HIGH
Range
2
LOW
Range
Axle in HIGH range for on-highway driv-
ing.
LOW
Range
Dual Range Driving
Important Procedures to Remember
•Shift axle at slower speed until you are accustomed to driving the
vehicle.
•Park truck in axle in LOW range.
•Never engage lockout when wheels are spinning.
•Engage lockout only under poor traction.
•Do not operate truck on dry pavement with lockout engaged.
With good traction, keep lockout disengaged.
Dana Lockout
Selector Valve
UNLOCK LOCK
Inter-axle Differential
Dana Lockout
Selector Valve
Drive with axle in LOW or HIGH range.
With poor traction, engage lockout. Drive
with axle in LOW range only.
UNLOCK LOCK
Inter-axle Differential
3
Dual Range Driving
Dual Range Tandem Axle Features
Driving a truck in heavy-duty, on-off highway operations is a pleasure with the
Dana Dual Range concept. Two axles-in-one give you flexibility for easy driving, productive hauling regardless of operating conditions.
Power when you need it; speed when you want it. The Dana dual range axle is
designed to provide deep-hole reduction for power in off-highway driving and
fast ratio for top speeds on the highway.
In LOW range the axle operates as a strong double reduction axle for tough
operating conditions. In HIGH range, it functions as a strong single reduction
axle for high-speed operations.
Shifting the Dana dual range axle is easy and quick. An air control valve
selects the axle ranges you want. A flip of the valve lever is all that is necessary.
4
Dual Range Driving
Dual Range Axle Overview
When the axle selector valve lever position is changed, an air-operated shift
system goes into action.
A piston air-shift unit mounted in the axle does the work. When air pressure is
applied to the piston, it shifts the axle from one range to another. A heavy-duty
compression spring assures rapid return action when air pressure is released.
Shifting within the axle is accomplished through Dana exclusive clutch gearing designed for fast, smooth shifting.
There’s no-strain driving in on-off highway operations with an Dana dual
range tandem.
For additional information, call the Dana Call Center at 1-877-777-5360
5
For spec‘ing or service assistance, call 1-877-777-5360 or visit our website at www.dana.com
Dana Commercial Vehicle Products Group
3939 Technology Drive
Maumee, Ohio, USA 43537
www.dana.com
All applications must be approved by the Application Engineering Department.
Specifications and/or design are subject to change without notice or obligation.
Printed in USA AXDR-0117 10/07
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