MIL-PRF-46750E(AT)
(738-742 lb-ft). Transmission performance shall be in accordance with applicable specification
sheet. Reduce input speed to 300 ± 25 rpm and shift to no steer. Repeat the above sequence for
LH steer.
4.3.3.5 Lockup clutch engagement no load. Operate transmission with range selector in
third gear, throttle valve full "on", with no load on output shaft, and check for performance
requirements.
4.3.3.6 Lockup clutch load. Operate transmission with range selector in third gear,
throttle valve full "on", with an input speed of 2045-2055 rpm, the load on the dynamometers
shall be increased to produce 1356-1491 N-m (1000-1100 lb-ft) total transmission output torque,
and checked for performance requirements.
4.3.3.7 Lockup clutch disengagement- no load. Operate transmission with the range
selector in third gear, with no throttle valve pressure, the lockup clutch engaged, no load on
output shafts, and check for performance requirements.
4.3.3.8 First range steer. With the range selector in first range, throttle valve full "on",
with an input speed of 1490-1510 rpm and a 678-813 N-m (500-600 lb-ft) load on the output
shafts, monitor cooler oil flow. Move the steer lever to full RH steer position and increase the
load on the LH output in accordance with MIL-PRF-46750/1A or MIL-PRF-46750/2A, as
applicable. Check for performance requirements. Reduce input speed to 300 rpm ± 25 rpm and
return steer lever to "no steer" position. Repeat the above sequence to LH steer, interchanging
RH and LH.
4.3.3.9 R2 function. Transmission shall be operated with selector in R2, the throttle value
full "on", an input speed of 1640-1660 rpm, and an output speed of 275-335 rpm, check for
performance requirements.
4.3.3.10 Service break capacity. With the selector lever in first range, throttle valve full
"on", and RH output shaft coupled to and stalled by the dynamometer, the input speed shall be
increased until RH output shaft torque is as specified in MIL-PRF-46750/1A or
MIL-PRF-46750/2A, as applicable. With 133 to 138 N-m (98 to 102 lb-ft) torque applied to RH
brake shaft and dynamometer released, the RH brake shall meet performance requirements. The
above procedure shall be repeated on the LH brake.
4.3.3.11 Fourth range friction loss. Operate transmission with the range selector in fourth
range, the throttle valve full "on", and the output shafts uncoupled and an input speed of
1995-2005 rpm, and check for performance requirements.
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