FED-STD-791D
10. Install test gears on proper shafts with the serial number facing out ward ( narrow
gear on drive shaft, wide gear on driven shaft ), matching timing marks on shafts
and gears. Check for proper setting of the retaining nuts and lock washers. After
tightening the retaining nuts, bend one tang of each lock washer to lock the
retaining nuts in position.
11. Loosen the lock nut on the driven shaft adjusting pin (at rear of gear case ) , and
unscrew adjusting pin until driven shaft is free to move to the extreme rearward
position without touching the adjusting pin. Using a scale set adjusting pin so that
the driven shaft can move through only one half of the normal free travel ( from
extreme rearward position to extreme forward position ). Tighten lock nut on
adjusting pin.
12. Re install gear-case end cover with induction heating coil
13. Connect induction heating coil in end cover to load coil transformer. Visually
check position of induction heating coil relative to the test gear hubs.
NOTE 4. The induction heating coil should not touch either test gear and should be
insulated from the test end cover. An ohm meter may be used to insure that the coil is
insulated from the end cover and test gears.
14.
Turn on water supply to induction heater load coil transformer and induction
heating coil.
15.
Turn on ventilating blower in load coil transformer.
16.
Turn on ventilating blower connected to gear-case end cover.
Turn on air to non rubbing seals. Adjust to approximately 6.9 kPa gage (1
17.
psig).
NOTE 5:
Approximately 0.33 L/sec (0.7 cfm) of air (total for both air seals) is
required for the nonrubbing air seals to function correctly.
18.
Fill test-oil sump with approximately 1 L of test oil.
19.
Start test-oil pump motor, and immediately open test-oil drain line from
test-oil pressure gage and pressuretrol to allow new test oil to fill the line to
the gage and pressuretrol. Close test-oil drain line.
20.
Push test-oil heater button to "ON" position.
21.
Allow approximately 20 min to elapse after turning support oil sump heaters
on (step 3). Then start support oil pumps.
22.
Turn timer switch to "STOP" position.
23.
Check electric timer to insure it is set to 10 min and 0 s, then lock timer dial.
24.
Turn rpm-adjust control to "ZERO" position.
When the support-oil temperature is up to the specified value of 73.9° 2.8°
25.
C (165° 5°F), adjust the support oil supply pressure to the required values.
26.
Check calibration of the rpm counter by setting the input-sensitivity control
to the "CHECK" position and the gate-selector switch to the "ONE
SECOND" position. The counter should read "60." After checking, turn the
input-sensitivity control to about midscale.
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