Specifications

87
Driver-Controlled Main Differential Lock
MAINTENANCE MANUAL
Engagement or Lockout of the DCDL
WARNING
During DCDL disassembly or differential re-
moval, when the DCDL is in the locked or en-
gaged position and one of the vehicle’s wheels
israisedfromtheoor,donotstarttheengine
and engage the transmission. The vehicle can
moveandcauseseriouspersonalinjury.Dam-
age to components can result.
Park the vehicle on a level surface. Block the
wheels to prevent the vehicle from moving.
Support the vehicle with safety stands. Do not
workunderavehiclesupportedonlybyjacks.
Jacks can slip and fall over. Serious personal
injuryanddamagetocomponentscanresult.
Manual Method
Use the following manual engaging method to
shift the DCDL into the locked position:
If an auxiliary air supply is not available or if the
differential differential is to be stored for later
use, use this manual engaging method for the
DCDL. Figure 6.2 and Figure 6.3.
1. Park the vehicle on a level surface. Block the
wheels to prevent the vehicle from moving.
2. Remove the drain plug from the bottom of
the housing and drain the lubricant.
3. Use a jack to raise the left-hand wheel of
the drive axle.
4. Placeajackstandundertheleft-handspring
seat to hold the vehicle in the raised posi-
tion.
5. Disconnect the driveline from the input fork
of the differential.
6. Disconnect the vehicle air line from the
inter-axle differential and main differen-
tial lock actuator assemblies.
7. Remove the plug and gasket from the hole in
the center of the Threaded DCDL cylinder or
angedxedcapscrewDCDL.
8. Remove the manual engaging capscrew from
the top storage hole in the cylinder cover or
the shift tower with the threaded type shift as-
sembly. Figure 6.2 and Figure 6.3.
NOTE:
For a xed capscrew DCDL shift assem-
bly, the storage hole for the plug and gas-
ket is the opposite end of the storage hole
for the manual engaging capscrew. Figure
6.3.
9. Install the plug and gasket into the bottom
storage hole in the cylinder cover or in the
shift tower.
Threaded DCDL
AIR HOSE
CYLINDER
STORAGE
HOLE
MANUAL ENGAGING
CAPSCREW
Figure 6.2
FIXED CAPSCREW DCDL
AIR LINE
CYLINDER
COVER
PLUG AND
GASKET
WIRE
OPERATING POSITION
HOLE
MANUAL
ENGAGING
CAPSCREW
TOP STORAGE HOLE
FOR MANUAL ENGAGING
CAPESCREW
Figure 6.3
BOTTON STORAGE HOLE
FOR PLUG AND GASKET