FED-STD-791D
NOTE 7: If the supply of test oil is limited, this flushing between tests on "A" and "B"
sides of the gears may be omitted.
11.
Turn valves L, M, and N to running position.
12.
Fill test oil system with a new charge of test oil (500 mL). Then push test oil
heaters button "ON".
13.
Allow at least 20 min to elapse since the support oil heaters were turned on
(step 1). Then start support oil pumps.
When the test oil and support oil temperatures are up to the specified value of
14.
73.9 2.5C (165 5F) check support oil chamber vacuum 2.5 to 10.2 cm
(1 to 4 in) of water.
Check test oil flow rate as described in 6.2, step (27).
15.
16.
Proceed on test on "B" side of the test gears, by following the procedure
outlined in 6.3.1 steps (1) through (18).
17.
Flush test oil system with Stoddard solvent, as follows:
a. Turn 3-way valve M to running position.
b. Turn 3-way valve N to running position.
c. Fill test oil sump with about 750 mL of the solvent. Watch drop of level in
sump. Slowly turn the test gears by operating the indexing ratchet. Allow
about 400 mL to drain through L.
d. Drain the next 100 mL by opening drain K also. Then close drain K.
e. Turn valve L to running position, so as to permit flushing of that section of
the test oil system between valve L and sump.
f. Drain the remaining 250 mL by turning valve M to bypass the Ryder gear
machine, and turning valve N to "DRAIN".
NOTE 8:
The flushing fluid is to be used only once and then discarded.
18.
Flush test oil system with petroleum ether, by repeating step (17).
19.
Operate test oil pressure pump in reverse for about 60 s, and then resume
normal rotation. To reverse pump, adjust the variable speed transmission.
20.
Stop test oil pressure pump.
21.
Remove gear case end cover.
22.
Remove O-ring.
23.
Remove used test gears.
24.
Blow out gear case and test oil jet with compressed air.
25.
Blow out line screen filters with compressed air.
26.
Reinstall gear-case end cover (without test gears).
27.
Push support oil heaters button "OFF". Then stop support oil pumps.
28.
Push instruments button "OFF".
29.
Turn off main electric switch to test cell.
30.
Turn off main water valve to test cell.
6.3.3 Sequence for repeat test. Repeat test on the same oil may be conducted by
omitting steps (26) through (30) of the sequence for "B" side of the test gears (6.3.2.
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