Spicer Tandem Drive Axles Service Manual D170, D190, and D590 Series User Manual

Page 15

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

Power Divider