TM-9-2320-273-10

TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; OPERATOR’S MANUAL

DECEMBER 2012
TM-9-2320-273-10

  TM-9-2320-273-10 - Page 192 of 452

OPERATING TRAILER BRAKE HAND CONTROL
CAUTION
After use, always return the trailer brake hand control to its
off position (all the way up), or the trailer brakes will burn.
Failure to comply may result in damage to equipment.
Use the trailer brake hand control to help avoid jackknifing. This control applies the
trailer brakes only. To apply the trailer brakes, pull down on the control. Be sure to
return the trailer brake hand control to its off position (all the way up) when finished.
END OF TASK
OPERATING INTER-AXLE DIFFERENTIAL LOCKUP
CAUTION
Do not operate the truck on hard surfaces any longer than
necessary with the differential lockup engaged. Driveline
windup may occur and damage the differential.
Inter-axle differential lockup provides additional traction by applying full torque to both
rear axles. On M916 through M920 models, the front driving axle is also engaged. This
feature should be used any time tractive conditions are poor, e.g., rainy or icy
pavement. For M916 through M920 models, it should also be used in off-road
operations.
The Differential Lock/Unlock control (Figure 16, Item 1) is located on instrument panel
(Figure 16, Item 2) to the right of driver. Use the following instructions to engage and
disengage the system.
Engage Inter-axle Differential Lockup All Models
1. Pull to the side of the road and stop truck.
2. Place Differential Lock/Unlock control (Figure 17, Item 1) in the LOCK position.
3. Observe that Differential Lockout indicator light (Figure 17, Item 3) comes on.
The truck is now ready for operation.
NOTE
On all models, if the Differential Lockup indicator light does
not go off it may be necessary to back up slowly, go forward
again, and repeat until the light goes off.
Disengage Interaxle Differential Lockup (M915)
1. Remove foot from the accelerator pedal.
2. Place Differential Lock/Unlock control (Figure 17, Item 1) in the LOCK position.
3. Observe that Differential Lockup indicator light (Figure 17, Item 3) goes off. The
system is now disengaged.
TM 9-2320-273-10
0010
0010-26


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