Spicer Tandem Drive Axles Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 - Manual (Page 117)

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Dual Range Axle Shift Systems
Dual Range Axle Shift
S
ystems
Dual Range Axle Shift Systems
There are two shift system designs predominantly used to se-
lect range of an Dana dual range tandem axle.
1. Standard System. For range selection, a cab-mount-
ed air shifter valve operates two air shift units mount-
ed on the axles.
The inter-axle differential lockout is of the straight-air
type and air-operated to engage lockout and spring-
released to disengage lockout
2. Axle Range Interlock System. This system has an
added feature to prevent axle shifting when the inter-
axle differential is locked out. The axle range air
shifter valve for this system includes an Interlock Pin
Assembly to provide the interlock feature.
The inter-axle differential lockout is of the straight-air
type. It is equipped with an Interlock Control Valve
which controls air pressure delivery to the shifter
valve Interlock Pin.
Detailed information on these systems is included in
this manual.
“Reverse-Air” Type Inter-axle Differential Lockout.
Some shift systems may include this lockout design. It is
spring-operated to engage or “Lock” the differential and air-
operated to disengage or “Unlock” the differential.
For information on this type lockout, or other system design
variations, contact your local Dana representative.