Spicer Tandem Drive Axles Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 - Manual (Page 120)

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Dual Range Axle Shift Systems
“Standard” Lockout (straight-air type)
Description:The “standard” lockout unit is of the straight-air
type and is air-operated to engage lockout and spring-released
to disengage lockout. The piston is mechanically connected to
the shift fork and sliding clutch. The clutch engages or disen-
gages the helical-side gear to lock or unlock the inter-axle dif-
ferential.
1 - Push rod
2 - Shift Fork
3 - Power divider cover
4 - Sliding clutch engages or disengages helical - side gear
Engage Lockout
(Lock Differential)
When the air shifter valve lever is mov
the engaged or "lock" position, the valv
opended and supplies air to the lockou
cylinder.
Air pressure enters cover - moves pist
shift fork and sliding clutch. Clutch
engages helical-side gear. Inter-axle
differential is locked out (or not operat
Disengage Lockout
(Unlock differential)
When the air shifter valve lever is
moved to the disengaged or "Unlock"
position, the valve is closed and air
pressure in the cylinder is exhausted.
Air pressure at piston is released.
Spring pressure moves piston, shift
fork and sliding clutch. Clutch is
disengaged from helical-side gear.
Inter-axle differential is unlocked and
functions normally.