MIL-DTL-62460E
4.6.3 Performance tests. The following test procedures, or equivalent procedures
acceptable to the Government, shall be applied to determine conformance to requirements of 3.4.
Prior to performing the following tests, preparation for testing 4.5.4 shall have been accomplished
to provide a proper setup.
4.6.3.1 Functional check. To determine initial conformance to 3.4.1 and 3.4.2:
a. Apply 56 to 76 L/min flow into lube port L.
b. Apply 1380 +35 kPa to control port M and hold that pressure.
c. Gradually increase the steer unit input shaft speed in CW direction of rotation to
3900 rpm in the geared steer mode and to 1800 rpm in the clutch brake mode.
CAUTION!! DO NOT SHIFT FROM GEARED STEER TO CLUTCH BRAKE
OR VICEVERSA AT HIGH SHAFT SPEEDS.
d. Operate the steer control lever through the full steering range at various input shaft
speeds in both geared steer and clutch brake.
e. Repeat c and d above except in reverse counter clockwise (CCW) direction of
rotation with input speed increasing to only 750 rpm.
4.6.3.2 Lube regulator. To determine conformance to 3.4.3 and table I, and 3.4.4.a:
a. Vent control port M to steer unit sump, place selector in geared steer mode, and
leave steer control lever at 0 steer position.
b. With 0 rpm to steer unit, apply flow into lube port L. Slowly increase the flow
rate until pressure at lube port L is per test item A of table I, then hold that
pressure and record the flow rate. Also record the pressure at each of the six lube
pressure ports for conformance to 3.4.4.a.
c. Repeat b for test item B of table I.
d. Increase the flow rate until it is per test item C of table I, then hold that flow rate
and record the pressure at lube port L and the six lube pressure ports.
e. Repeat d for test item D of table I.
f. Repeat a thru e above, except with selector in the clutch brake mode.
4.6.3.3 Lube pump high pressure output and auxiliary regulator in geared steer mode. To
determine conformance to 3.4.4.b, 3.4.5, 3.4.6, 3.4.7, and 3.4.8 in geared steer mode:
a. Vent control port M to steer unit sump, apply 56 to 76 L/min flow into lube
port L, place selector in geared steer mode, and leave steer control lever at 0 steer
position.
b. Slowly increase the input shaft speed and record the following:
1. For conformance to 3.4.5, record the minimum clockwise (CW) output speed
required to produce 552 kPa at the high speed clutches.
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