MIL-PRF-46750E(AT)
3.4 Operating requirements. Each transmission shall provide the following functional,
operational, and performance capabilities. The individual item requirements shall be as specified
herein and in accordance with the applicable performance specification sheet(s). Where the word
"transmission" is used herein, it is intended to mean an assembly consisting of the main
transmission assembly and the input transfer gear assembly.
3.4.1 Oil temperature and oil level. Unless otherwise specified, the cooler-in oil
temperature shall be maintained between 82 and 121 degrees Celsius (°C) (180 and 250 degrees
Fahrenheit (°F)) during dynamometer operation. Oil level in the transmission shall be maintained
within the proper operating range during operation.
3.4.2 Functional operations. The transmission shall operate at 300-400 revolutions per
minute (rpm) input speed in all shift and steer positions without any indications of mechanical
malfunction.
3.4.2.1 First to second range shift. The transmission shall shift at 300-400 rpm input
speed from first range to second range without any momentary stop or decreased speed.
3.4.2.2 Brake adjustment. The transmission brakes shall be adjusted so when the brake is
applied with 133-138 Newton meter (N-m) (98-102 pound-feet (lb-ft)) torque, rotation on the left
hand (LH) and right hand (RH) brake apply shafts is not less than 28 nor more than 32 degrees (°)
travel.
3.4.3 Fourth range stall. Fourth range stall shall be in accordance with
MIL-PRF-46750/1A or MIL-PRF-46750/2A, as applicable.
3.4.4 Third range steer. Third range steer shall be in accordance with Table I and
MIL-PRF-46750/1A or MIL-PRF-46750/2A, as applicable.
TABLE I. Third range partial steer performance values.
Item
RH
LH
Minimum (min.) Maximum (max.)
Min.
Max.
Direction of steer limits
Input speed (rpm)
*1450
*1510
*1450
*1510
Output torque (N-m)
*217
*813
*271
*813
(200 lb-ft)
(600 lb-ft)
(200 lb-ft)
(600 lb-ft)
Steer lever travel for
0.5
6.5
0.5
6.5
Output clutch pressure
to drop to 0 (°)
3
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