Spicer Tandem Drive Axles Pro-40 Single Reduction and Single Reduction with Differential Lock - Manual (Page 90)

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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 rotat-
ing 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 damage 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 dam-
age 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.
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