MIL-DTL-62460E
4.5.3.1 Test fixture. A test fixture, to mount the steer unit that will also act as an anchor
to counteract the output torque, shall be performed.
4.5.3.2 Power source. A powertrain to drive the steer unit input shaft at speeds up to
3900 rpm in the CW direction and 750 rpm in the CCW direction, input torque up to 7000 N.m in
both directions, and up to 250 input horsepower in both directions shall be used (see figure 1).
4.5.3.3 Dynamometers. A dynamometer coupled to each steer unit output shaft is to be
capable of absorbing an input torque of 6200 N.m at a speed of 300 rpm, and other torque and
speed combinations listed in tables VI and VII.
4.5.3.4 Dynamometer cooling system. A system such as a cold water circuit to cool the
dynamometers shall be provided.
4.5.3.5 Dynamometer control system. A system to control the input torque to the
dynamometers, and thus control the input torque to the steer unit shall be provided.
4.5.3.6 Dynamometer mounting stands. Stands to mount the dynamometers that will also
act as anchors, to counteract the input torque shall be provided.
4.5.3.7 Hydraulic power source. A hydraulic power source capable of 2100 kPa pressure
at 76 L/min flow, and a hydraulic circuit setup similar to that shown in 4.5.2 shall be provided.
4.5.3.8 Hydraulic oil temperature control. Means to heat and to cool the oil so that oil
temperature can be maintained within the limits specified in 4.5.2 shall be provided. A relief valve
can also be used for heating, and an air-oil heat exchanger for cooling.
4.5.3.9 Instrumentation. Gages and meters to measure the items listed below shall be
used. For locations, see figures 1, 2, and 3.
a. Pressure gages at lube port L and the six lube pressure ports to measure 0 to
210 kPa.
b. Pressure gages at main control port M and the six clutch pressure ports to measure
0 to 1520 kPa.
c. Flow meter at lube port L to measure 0 to 76 L/min flow into L.
d. Flow meter at main control port M to measure 0 to 23 L/min flow into M.
e. Torque meters to measure torque at the steer unit input shaft from 0 to 7000 N.m,
and at each output shaft from 0 to 6200 N.m.
f. Tachometers to measure speed of the steer unit input shaft from 0 to 3900 rpm,
and speed of the steer unit output shafts from 0 to 3100 rpm.
g. A temperature probe and readout to indicate the temperature of the oil in the steer
unit sump from 0 to 104°C.
h. A scale or other means of measuring movement of the steer control lever from 0°
to 38° LH and RH steer, with an accuracy of +0.5 degree.
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