CHECK TIRES and make sure all tires are inflated to proper pressures,
CHECK FREQUENTLY FOR RUST AND FUNGUS GROWTH, both of which are com-
mon problems in hot, humid weather. CLEAN AND LUBRICATE YOUR TRUCK to
help prevent deterioration.
2-21. Unusual Terrain.
BECOME FAMILIAR WITH THE PROCEDURES IN FM 21-305 for driving on unusual
terrain. The M915A1 is not designed or intended for off-road use. If, however, you
should find the adverse conditions described in this paragraph unavoidable, the recom-
mended procedures given should be applied.
In areas WHERE THE GROUND SURFACE PROVIDES POOR TRACTION, MOVE
THE DIFFERENTIAL LOCK/UNLOCK LEVER TO THE LOCK POSITION (See instruc-
tions in paragraph 2-12).
When you engage the locking system, driving axles receive equal torque.
Use the differential lock/unlock control as needed for better traction. Disengage dif-
ferential lockup when conditions are back to normal. For instructions on operating
the inter-axle differential lockup system refer to paragraph 2-12.
WOODS AND ROCKY TERRAIN
MAKE SURE YOUR TRUCK CAN CLEAR ANY GROUND OBSTRUCTIONS LIKE
STUMPS OR ROCKS BEFORE YOU DRIVE OVER THEM. Such objects can damage
components underneath the truck. Try to avoid hanging limbs which might cause
If you must drive over very rocky terrain, BE SURE YOU HAVE A SPARE WHEEL
AND TIRE, since there will be a greater chance of tire punctures.
MUD OR OTHER SOFT SURFACES
Before you enter mud or other soft surfaces, check the conditions, and SELECT
THE TRANSMISSION GEAR RANGE THAT YOU JUDGE APPROPRIATE TO GET
YOUR TRUCK THROUGH the area. Enter the soft area at a medium speed for the
gear range you have selected.
MAINTAIN A STEADY PRESSURE ON ACCELERATOR PEDAL to keep your truck
rolling until you reach solid ground again. Do not accelerate to the point of spinn-
ing the wheels.
IF YOUR TRUCK GETS STUCK, TRY TO PULL OUT SLOWLY IN A LOW GEAR
RANGE. YOU MAY HAVE TO PLACE BOARDS, BRUSH OR SIMILAR MATERIAL
UNDER TIRES TO PROVIDE TRACTION.