Spicer Tandem Drive Axle Dual Range & Double Planetary 34,000-45,000 lbs - Manual (Page 61)

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 disengages the helical-side gear to lock or unlock
the inter-axle differential.
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.
Engage Lockout
(Lock Differential)
When the air shifter valve Iever is
moved to the engaged or “Lock”
position, the valve is opened and
supplies air to the lockout cylinder.
Air pressure enters cover—moves
piston, shift fork and sliding clutch.
Clutch engages helical-side gear.
Inter-axle differential is locked out
(or not operating).
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