Spicer Tandem Drive Axles Service Manual D170, D190, and D590 Series - Manual (Page 15)

11
Inter-Axle Lockout
IAD Differential Lock Disassembly
Inter-Axle Lockout
Integral Shift Cylinder with Welded Push Rod Assembly
Disassembly
1. With the axle installed in vehicle, place differential
lock selector valve in the disengaged or unlocked
position.
2. Disconnect the differential lockout air line.
3. Remove the piston cover.
4. Remove the piston and o-ring assembly with pliers.
Note: In order to remove the shift fork and push rod parts,
first remove the power divider cover. See the Power
Divider section.
Assembly
1. Assemble the o-ring onto the piston. Apply silicone
grease to the o-ring.
2. Gently push the piston o-ring assembly into the lock-
out cylinder bore. Make sure the piston assembly is
pushed in all the way.
3. Install the piston cover. Tighten by hand and then
torque from 50-75 lbs. ft. (68-102 N•m).
4. Connect the differential lock air line.
5. Cycle the lockout to make sure there are no leaks
and the system is operating properly.
1 - Compression spring
2 - Shift fork assembly
3 - Piston
4 - O-ring
5 - Piston cover
5
4
3
1
2
Power Divider