Specifications

Driver-Controlled Main Differential Lock
88 MAINTENANCE MANUAL
10.Install the manual engaging capscrew into
the threaded hole in the center of the cylin-
der cover or cylinder.
WARNING
THERE WILL BE A SMALL AMOUNT OF
SPRING RESISTANCE FELT WHEN YOU TURN
IN THE MANUAL ENGAGING CAPSCREW. IF A
HIGH RESISTANCE IS FELT BEFORE REACH-
ING THE LOCKED OR ENGAGED POSITION,
STOP TURNING THE CAPSCREW, OR THE
COVER, FORK AND CAPSCREW THREADS
WILL BE DAMAGED.
11.Turn the manual adjusting capscrew to the
right until the head is approximately 0.25-inch
(6 mm) from the cylinder cover. Do not turn
the capscrew beyond its normal stop.
A high resistance on the capscrew indicates
that the splines of the shift collar and the differ-
ential case half are not aligned or engaged. To
align the splines, use the following procedure.
A. Rotate the left-hand wheel to align the splines
of the shift collar and case half while you turn in
the manual engaging capscrews.
B. When the normal amount of spring resis-
tance is again felt on the capscrew, the
splines are engaged. Continue to turn in the
manual engaging capscrew until the head
is approximately 0.25-inch (6 mm) from the
cylinder cover. The capscrew is now in the
service position and the main differential lock
is completely engaged.
12. Remove the differential from the axle hous-
ing. See the Section 3.
13.Release the differential lock by removing
the manual engaging capscrew and seal
from the cylinder cover or cylinder.
Auxiliary Air Supply Method
1. Park the vehicle on a level surface. Block the
wheels to prevent the vehicle from moving.
2.Useajacktoraisetheleft-handwheelofthe
drive axle. Place a safety stand under the left-
hand axle housing leg to support the vehicle in
the raised position.
3. Remove the drain plug from the bottom of the
housing and drain the lubricant.
4. Disconnect the driveline from the input fork.
5. Disconnect the vehicle air line from the inter-
axle differential and main differential lock ac-
tuator assemblies.
6. Install a suitable air line coupling into the main
differential actuator assembly.
7. Install the air line into the coupling.
WARNING
WHEN YOU USE AN AUXILIARY AIR SUPPLY
TO ENGAGE THE DCDL, YOU MUST SUPPLY
AIR TO THE DCDL UNTIL YOU REMOVE THE
DIFFERENTIAL. DO NOT DISCONNECT THE
AIR LINE OR REDUCE AIR PRESSURE TO
THE DCDL BEFORE YOU REMOVE THE DIF-
FERENTIAL FROM THE HOUSING.
DAMAGE TO COMPONENTS CAN RESULT.
8.Supply 120 psi (827 kPa) regulated air pres-
sure through the air line.
9. Verify that the DCDL is engaged.
10.Remove the differential from the axle hous-
ing. See the Section 3.
11. Shut-off the air supply to the DCDL..
12. Disconnect the air line from the main differ-
ential actuator assembly coupling.
Figure 6.4
NUBS