Spicer Convertible Tandem Axles - Manual (Page 64)

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Theory of Operation
With Lockout Engaged

(Inter-Axle Differential is Not Operating)
Lockout should only be engaged when both axles are rotating
at the same speed. Operation should be limited to low-traction
situations and should be disengaged when normal traction
returns. Failure to do so will result in poor handling and dam-
age to the axle components.
Note: Varied road surface conditions can result in unequal
torque distribution between the two axle assemblies.

Prolonged operation with the lockout engaged can damage
axle and driveline components.
CAUTION CAUTION
1 - Input torque
2 - Lockout engaged
3 - Forward axle torque is transmitted from the helical side

gear through the pinion helical gear, drive pinion, ring gear,

wheel differential and axle shafts.
4 - Rear axle torque is transmitted from the output shaft side

gear through the output shaft, inter-axle driveline, drive

pinion, ring gear, wheel differential and axle shafts.
5 - Input torque (power flow) from the vehicle driveline is

transmitted directly to the helical side gear and the output

shaft. A positive drive is provided to both axles for

maximum traction under adverse road conditions.
1
2
3
5
4