Specifications

81
Assembly and Installation
MAINTENANCE MANUAL
14.Adjusttheshiftforkfortheinter-axlediffer-
ential lock. The movement of the shift fork
is controlled by the adjusting screw ofthe
locking mechanism.
A. Loosenthejamnutontheadjustingscrew.
Loosen the adjusting screw so that the
screw does not touch the shift of the drive
mechanism. Figure 5.106.
B. Apply and hold 60 psi (413 kPa) of air pres-
sure to the shift cylinder so that the shift col-
lar engages the splines in the inter-axle dif-
ferential case.
C. Verify that the adjusting screw does not
touch the shift shaft when the shift collar
engages the inter-axle differential case.
D. Tightentheadjustingscrewuntilthetipofthe
screw touches the end of the shift shaft. Re-
lease the air pressure
D. When the screw touches the shaft, tighten
theadjustingscrewanadditionaloneturn.
Applyairpressure,thentightenthejamnut.
Figure 5.107.
F. Disengage the inter-axle differential lock by
holdingtheinputforkorangeandrotating
theoutputforkorange.Theoutputforkor
ange should rotate with less than 50 lb-ft
(67 Nm) of torque applied.
.
G. Apply and hold 60 psi (413 kPa) of air
pressure to the shift cylinder mechanism
to verify that the shift collar engages the
splines in the inter-axle differential case.
When the input fork or ange is rotated,
theoutputforkorangemustrotate.Re-
lease the air pressure.
H. Apply a rust prevention oil, for example, as
Meritor part number 1199-U-1113 or equiv-
alent to the inlet of the air cylinder.
15. Connect the vehicle driveshafts to the in-
put and the thru forks or flanges.
16. Connect the air lines to the inter-axle differen-
tial air cylinder and, if used the main differential
lock cylinder.
17. On axles with a main differential lock, con-
nect the electrical connector of the sensor
unit. Verify that the main differential lock
is disengaged.
SHIFT SHAFT
LOOSEN THE JAM NUT AND
ADJUSTING SCREW.
Figure 5.106
TIGHTEN THE ADJUSTING
SCREW ONE TURN AFTER THE
SCREW TOUCHES THE END OF
THE SHOFT.
APPLY 60 PSI (413 kpa)
OF AIR PRESSURE
HERE.
SHIFT SHAFT
Figure 5.107