FED-STD-791D
14.
Continue the test at 34 kPa (5 psi) load oil pressure increments, until the
average scuffed area for all 28 teeth is closest to 22.5%. At this juncture,
visually estimate the percent effective tooth width to the nearest 1 percent,
and record the value.
15.
Also at this juncture, install photographic equipment and take a photograph
of each gear tooth. Make the first frame a test identification frame.
NOTE 4:
Step (15) is optional. Photographic records of the scuffed gear teeth are
not required in current test specifications. Using the photographic
equipment as supplied (see 4.5), and Plus-X film, the camera should be set
at a lens aperture ("f" value) of 16. The actual exposure time is controlled
by the electronic flash unit; but to insure adequate exposure, the camera
speed should be set at 1/25 s.
16.
Further continue the test at 34 kPa (5 psi) load oil pressure increments, until
an approximate average scuffed area of 40% or more is obtained.
17.
Push test oil heaters button "OFF".
18.
Drain all test oil by first opening 3-way valve L and then valves K and N.
19.
Close all drains.
20.
Stop test oil pressure pump.
21.
Push support oil heaters button "OFF".
22.
Stop support oil pumps.
Leave other controls on if test on "B" side will proceed after a short
NOTE 5:
midday break. Otherwise, push instruments button "OFF", and turn off
main electric switch and main water valve to test cell.
6.3.2 Test on "B" side of test gears.
The "B" side refers to the side obtained by reversing the gear (serial
NOTE 6:
numbers away from end cover).
1.
Push support oil heaters button "ON".
2.
Remove gear case end cover.
3.
Remove O-ring.
4.
Blow out test oil jet with compressed air.
5.
Blow out line screen filters with compressed air.
6.
Reverse test gears so that the serial numbers face inward, again matching
timing marks on shafts and gears. Check for proper seating of the retaining
nut, and lock the lock washer.
7.
Install new O-ring.
8.
Reinstall gear case end cover.
9.
Start test oil pressure pump.
10.
Flush test oil system with test oil, in accordance with 6.2, step (15).
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