Specifications

23
Removal and Disassembly
MAINTENANCE MANUAL
Removal Inter-Axle Differential Lock
IAD Shift Unit
Air Applied and Spring Release Models,
Standard.
1. Remove the cylinder.
A.For ange-type cylinders, remove the cap-
screws that fasten the cylinder to the cage off
differential . Remove the cylinder.
B. For threaded cylinders, remove the cylinder.
2. Remove the piston from the shift shaft.
Figure 3.38.
3. Remove the shift shaft from the cage of dif-
ferential. When you remove the shift shaft,
the fork and the spring may fall.
• If the shift shaft cannot be removed by hand:
Removetheadjustingboltandjamnut.Place
a brass drift through the adjusting bolt hole
against the rear of the shift shaft. Use a ham-
mer on the brass drift to remove the shift
shaft. Inspect the shift shaft for damage.
4. From the input shaft bore, remove the collar
and fork.
5.If necessary, remove the jam nut and the
adjustingbolt.
Spring Applied and Air Release Models, Re-
verse Shifter
1. Remove the four capscrews that fasten the
shift cylinder cover to the cage of differential.
2. Remove the two capscrews and washers that
fasten the cover to the shift cylinder. Remove
the cover and spring. Figure 3.39.
3. Remove the small snap ring from the cover
end of the shift shaft.
4. Remove the cylinder assembly from the shaft
5. Rotate the shift shaft until the “E” clip ahead
of the shift fork is at approximately the ve
o’clock position. Figure 3.40.
6.Withthe“E”clipbaseintheveo’clockposi-
tion, use needlenose vise grips or equivalent
to remove the “E” clip.
7. Remove the shift shaft from the differential.
When you remove the shaft, the fork may fall.
8. Remove the piston from the shift cylinder. In-
spect the O-rings for wear and damage. Re-
place the O-rings, if necessary.
FigurE 3.38
Figure 3.39
Figure 3.40
FORK
SPRING
PISTON
O-RING
SHIFT
SHAFT
COLLAR
BOLT-ON DCDL REVERSE SHIFTER
ADJUSTING BOLT
SCREW-IN DCDL
COVER
BOLT-ON DCDL
COVER CAPSCREW
Remove “E”clip from shaft before
reverse shifter removal
“E” CLIP BASE ROTATED TO
THE 5 O’ CLOCK POSITION
O-RING
O-RING
O-RING
PISTON
SMALL
SNAP RING
COVER
SHIFT SHAFT
SHIFT CYLINDER
“E” CLIP
SLOT”
SPRING
JAM NUT
“E” CLIP
REMOVED