FED-STD-791D
TABLE I. Operating conditions.
Condition
Value
10,000 10
Test gear speed, rpm
165 5F
73.9 2.5C
Test oil inlet temperature
270 5 mL/min
Test oil flow rate
165 5F
Support oil inlet temperature
73.9 2.5C
Support oil pressure
110 10 psig
758 69 kPa gage
Step-up gear box pressure
25 to 30 psig
172 to 207 kPa gage
Support oil chamber vacuum
1 to 4 in of water
2.5 to 10.2 cm of water
6.2 Preparation for test.
1.
Record pertinent information such as test number, test oil code, operator's
name, etc., on suitable data sheets (Figure 11).
2.
Turn on main electric switch to test cell.
3.
Turn on main water valve to test cell.
4.
Push instruments button "ON".
5.
Push support oil heaters button "ON".
6.
Make sure that the test oil system has been thoroughly flushed with Stoddard
solvent and petroleum ether after the last test. See 6.3.2 steps (17) through
(25) for the flushing procedure. Use the flushing solvent once and discard.
7.
Remove gear case end cover.
8.
Inspect shaft seals. Replace with new seals if necessary.
Inspect shafts for any nicks or other damage in the area of the seals. Damage
9.
must be repaired before machine is used for testing.
Clean a set of new test gears with dry cleaning solvent and discard solvent.
10.
Measure gross tooth width of the narrow test gear, and record the
measurement.
Install test gears with the serial number facing outward, matching timing
11.
marks on shafts and gears. (See Figure 5.) Check for proper seating of the
retaining nut, and lock the lock washer.
12.
Install new O-ring in position.
13.
Reinstall gear case end cover.
14.
Start test oil pressure pump.
15.
Flush test oil system with test oil, as follows:
a.
Turn 3-way valve L to "DRAIN".
b.
Turn 3-way valve M to running position.
c.
Turn 3-way valve N to running position.
d.
Fill test oil sump with about 750 mL of test oil. Watch drop of level in sump.
Allow 400 mL to drain through L.
e. Drain the next l00 mL by opening drain K also. Then close drain K.
f. Turn valve L to running position, so as to permit flushing of that section of
the test oil system between valve L and sump.
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