Spicer Tandem Drive Axles Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 - Manual (Page 123)

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Dual Range Axle Shift Systems
Dual Range Axle Shift
S
ystems
Disengage Lockout (Unlock Differential)
(Axle in High or Low Range)
1 - Reservoir air pressure
2 - Air exhaust
3 - Air pressure at piston is released. Re-
turn spring moves piston to disengage
lockout.
4 - Lockout cylinder piston movement
closes interlock control valve 5 - Air pressure to interlock pin is ex-
hausted through control valve port. Re-
turn spring moves piston and pin to
release shifter valve lever
6 - Interlock pin assembly
7 - Air exhaust
8 - Axle range shifter valve 9 - Sliding clutch disengages helical -
side gear
10 - Lockout cylinder
11 - Interlock control valve