Spicer Tandem Drive Axles Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 - Manual (Page 92)

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Wheel Differential Lock
Parts Inspection
Shift Fork Seal: Inspect shift fork seal for defects and tight fit
on shift fork. A spring is used to assure a closer fit of seal
around shift fork. If this spring is not present on axle being ser-
viced, install one when reassembling unit.
O-rings, Felt Oilers and Gasket: Replace o-rings, felt oilers
and cover gasket when piston air shift unit is disassembled for
repair.
Compression Spring: Inspect spring for distortion, cracks or
other visual defects. Replace a faulty spring.
Actuating Lever and Pins: Inspect lever pins and bearings for
worn or grooved condition. Inspect actuating lever and push
rod for worn or elongated holes at point where they are con-
nected. Replace faulty parts.
Piston: Inspect piston friction surface for worn, grooved or
damaged condition which will affect the piston movement in
cylinder. Replace a faulty piston.