Spicer Tandem Drive Axles Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 - Manual (Page 131)

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Inter-Axle Differential Lockout
Inter
-Axle Differential
Lockout
Speedometer Adapter
The speedometer adapters are lubricated and sealed for life of
the unit. No maintenance is required. Replace a faulty unit.
Solenoid Valve
Replace solenoid valve as an assembly. The valve should not
be serviced.
1 - Shift fork and push rod
2 - Lock washer
3 - Capscrew
4 - O-ring
5 - Cover
6 - Lock washer
7 - Control valve button
8 - Interlock control valve 9 - Lock nut
10 - Capscrew
11 - Lock washer
12 - Hex-nut piston
13 - Felt oilers
14 - Compression spring
15 - Lockout body