FED-STD-791D
g. Drain the remaining 250 mL by turning valve M to bypass the Ryder gear
machine, and turning valve N to "DRAIN".
NOTE 1:
The test oil for flushing is to be discarded after use. If the supply test oil is
limited, a reduced quantity may be used for flushing.
16.
Turn valves L, M, and N to running position.
17.
Fill test oil sump with a new charge of test oil (500 mL).
18.
Push test oil heaters button "ON".
19.
Close valve to support oil chamber vacuum manometer.
Allow at least 20 minutes to elapse since the support oil heaters were turned
20.
on (step 5). Then start support oil pumps.
21.
Turn timer switch to "STOP" position.
22.
Set electric timer to 10 min and 0 s. Then lock timer dial.
23.
Turn rpm adjust control to "ZERO" position.
Check calibration of electronic rpm counter by setting the input sensitivity
24.
control to "CHECK" position, and the gate selector switch to "ONE
SECOND" position. The counter should read 60. After checking, turn input
sensitivity control to about midscale.
25.
Turn load bypass control to "OPEN" position.
26.
When the test oil and support oil temperature are up to the specified value of
73.9 2.5C (165 5F), check support oil chamber vacuum 2.5 to 10.2
cm ([1 to 4 in], of water, see 4.2.3).
Check test oil flow rate as follows:
27.
a. Turn 3-way valve L to stop flow from the Ryder gear machine. By noting the
drop of oil level in the test oil sump, measure the time required for 270 mL of
test oil to accumulate in the Ryder gear machine. Then turn valve L back to
running position.
b. Adjust the variable speed transmission to vary the speed of the test oil
pressure pump, until the specified flow rate at 270 5 mL/min is obtained.
6.3 Test procedure.
6.3.1 Test on "A" side of test gears.
NOTE 2:
The "A" side of the gear refers to the side obtained by installing the test
gears with the serial numbers facing the end cover. The "B" side is
obtained by reversing thegear (serial numbers facing away from the end
cover).
Check all temperatures and pressures for the specified limits. (See paragraph
1.
3). Recheck test oil flow rate if necessary.
Make sure that the gear-tooth indexing rachet is locked in disengaged
2.
position.
3.
Make sure that the load adjust control is wide open (counterclockwise).
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