4-30 REAR AXLE - Continued
4-30.5 Air Shift Units.
This task covers
Shop Equipment, Automotive
9, Appendix E Dexron
Maintenance and Repair,
21, Appendix E Petroleum Jelly
22, Appendix E Pipe Sealant
28, Appendix E Silicone Sealant
113581 Lock Up Shift Unit
Main Engine Shutdown (see para. 2-10)
73507 CTD Air Shift Unit
APU Shutdown (see para. 2-12)
119855 Shift Fork Seal
Batteries Disconnected (see para. 4-24.12)
All Wheels Blocked
All Air Tanks Drained
a 4-Wheel Drive Air Shift Unit Replacement
Parts for the air shift unit can be bought
separately or as a total unit. The shift unit,
including the shift fork (10), is included in
the replacement unit. If shift fork must be
replaced, request assistance from Direct
Remove control air line (1) and fitting (2)
from shift unit cover (5).
Remove capscrews (3) and lockwasher (4)
attaching cover (5) Remove cover and O-
Remove nut (7), flatwasher (8), and O-ring (9) from shift fork push rod (10).
(4) Remove capscrew (11) and lock washer (12) attaching body (13) to power divider housing. Remove
body (13) and piston (16) assembled.
Remove spring (17) from shift fork (10).
Clean old sealant from power divider mounting flange.
If air shift unit is repaired, remove piston (16) from body (13). Remove piston stop (15).
Discard all O-rings and felt oilers. Inspect all other components for damage. Replace as
Inspect new components for nicks, scratches, and other defects before starting installation.