FED-STD-791D
3. Makeup oil should be added immediately after each 80 mL sample is taken by adding
sufficient quantity of unused test oil to the tank to bring the oil level in the visual sight
gage to the full mark.
4. The test oil filter changes should be made after shutting down on the first day. If the
pressure drop across the 100-mesh filter exceeds 21 gage kPa (3 psig) during operation,
the rig should be shut down in accordance with the shutdown procedure under 6.6.5,
and a new weighed filter reinstalled. The dirty 100-mesh filter element and the
40-mesh filter element are to be weighed and the amount of the weight gain recorded.
Prior to weighing, the 100- and 40-mesh filter screens should be allowed to drain for 1 h
at room temperature.
5. Actual running time should conform to the following conditions:
a. 17-hour maximum test time between shutdowns.
b. Minimum shutdown period of 7 h.
c. Minimum daily running time of 6 h.
6.6.5 Shutdown procedure.
1. Shut off bearing and tank heaters.
2. Open air regulated loading valve on console and reduce loading pressure to 172 gage
kPa (25 psig).
3. Continue running at these conditions until test bearing temperature (maximum) drops to
204C (400F).
4. Reduce load completely and shut off drive motor.
5. When the dynamatic output shaft stops turning, shut off test pumps, support pumps and
heat, test tank stirrer, main electrical and water switches, and all air valves.
6.6.6 Post-stabilization run.
1. This procedure is done in place of the last shutdown.
2. Repeat steps 1 through 3 of the shutdown procedure.
6.6.5 Shutdown procedure.
1. Shut off bearing and tank heaters.
2. Open air regulated loading valve on console and reduce loading pressure to 172 gage
kPa (25 psig).
3. Continue running at these conditions until test bearing temperature (maximum) drops to
204C (400F).
4. Reduce load completely and shut off drive motor.
5. When the dynamatic output shaft stops turning, shut off test pumps, support pumps and
heat, test tank stirrer, main electrical and water switches, and all air valves.
6.6.6 Post-stabilization run.
1. This procedure is done in place of the last shutdown.
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