FED-STD-791D
When the test-oil temperature is up to the specified value of 205 2.8C
27.
(401 5F), check the test-oil flow rate as follows: Adjust the speed of the
test-oil pump motor until the test-oil flow is approximately 270 mL/min.
Turn flow-check valve (Figure 4) to the closed position, and measure the time
required to fill the flow-check chamber to the tip of the wire indicator. The
time required should be 30 s. Turn flow-check valve to the open position to
allow the test oil to drain to the test-oil sump. If the time required to fill the
flow-check chamber to the tip of the wire indicator varies from the 30-second
requirement by more than 1 s, readjust the test-oil pump motor speed and
recheck test-oil flow rate as above.
The test-oil in pressure is maintained at 103.4 34.5 kPa gage (15 5
NOTE 6:
psig). If the test-oil pressure is outside the specified range, a different size
test-oil jet must be used. The test-oil jet sizes normally used are 0.066 and
0.081 cm (0.26 and 0.032 in) diameter, depending upon the test oil
viscosity.
28. Turn radiometer function switch to "NORMAL RANGE" position.
29. Check radiometer temperature detector spot position on narrow test gear.
Refocus temperature detector if necessary.
NOTE 7:
The radiometer temperature detector must be focused accurately on the
black chromium ring of the narrow test gear to insure correct test gear
temperature indication.
6.2.1 Test sequence on "A" side of test gears.
NOTE 8:
The "A" side of the gear refers to the side obtained by installing the test
gears with the serial numbers facing the gear-case end cover. The "B"
side is obtained by reversing the test gears such that the serial numbers
face the gear case.
1.
Turn radiometer function switch to "READY" position.
2.
Recheck test-oil flow rate as in step 27 of 6.2.1.
3.
Determine radiometer reference temperature using null meter on radiometer
NOTE 9:
The reference temperature must be subtracted from the predetermined test
gear operating temperature. After determining this difference, use this
value to determine from a temperature/radiometer reading calibration chart
the radiometer reading which must be maintained during the test run.
4.
Set radiometer scale selector to appropriate scale for test temperature desired.
5.
Turn radiometer function switch to "NORMAL RANGE" position.
6.
Turn on air supply to automatic load-control unit.
7.
Check to see that the rotating device of the gear-tooth inspection equipment
is in the disengaged position.
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