MIL-DTL-62030E(AT)
3.4.7.1 Brake coolant pump pressure. With transmission output shafts uncoupled from
the dynamometer, range selector in fourth range, and input speed of 900 to 1000 rpm, and the
"pivot" valve in the "land" position; the RH and LH coolant pressure shall not exceed 172 kPa
(25 psi). With the RH brake partially applied, the right hand coolant pump pressure shall rise to
345 kPa (50 psi) min, to 689 kPa (100 psi) max, and return to 172 kPa (25 psi) max when the
brake is released. With the LH brake partially applied, the LH coolant pump pressure shall rise to
345 kPa (50 psi) min, to 689 kPa (100 psi) max, and return to 172 kPa (25 psi) max when the
brake is released (see 4.5.5.7).
3.4.8 Reverse range stall. With the range selector in reverse-one (R1) range, output
shafts stalled by the dynamometer, full TV, and the input torque gradually increased to
157-163 N·m (116-120 ft-lb); the transmission performance shall be as specified in table V
(see 4.5.5.8).
TABLE V. Reverse range stall.
Item
Output torque N·m (ft-lb)
Oil pressure kPa (psi)
Main
5966 (4400) minimum
965 (140) min -1206 (175) max
RH reverse clutch
5966 (4400) minimum
Actual main -69 (10) min
LH reverse clutch
5966 (4400) minimum
Actual main -69 (10) min
3.4.9 Fourth range friction loss. With range selector in fourth range, an input speed of
1995-2005 rpm, no TV, output shafts uncoupled, and service brakes released; there shall be not
more than 136 N·m (100 ft-lb) input torque (see 4.5.5.9). The cooler "in" oil temperature shall be
between 66 and 107°C (150 and 225°F).
3.4.10 Downshift inhibitor. A fourth to third range downshift shall be permitted by the
downshift inhibitor when input speed is reduced slowly, with an initial input speed between 1950
and 2050 rpm in fourth range, no TV, and output shafts uncoupled. A first range to neutral shift
shall be permitted by the downshift inhibitor under the same conditions. Downshift input speed
shall be within the speed values specified in table VI. The lockup clutch shall be applied prior to
the downshift. Lockup pressure shall drop momentarily as the fourth to third range shift is made
and return to its original value when the shift is completed (see 4.5.5.10).
TABLE VI. Shift values.
Input speed (rpm)
Downshift range
min
max
4th to 3rd
1200
1520
1st to neutral
1240
1500
3.4.11 Speedometer drive. The speedometer drive gear shall rotate when the transmission
output shaft is turning (see 4.5.3 and 4.5.5.11).
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