FED-STD-791D
2. Repeat steps 1 through 3 of the shutdown procedure
3. Reduce load on bearing completely.
4. Allow the test oil tank temperature and the oil-in temperature to reach 138C (280F)
and 121C (250F) respectively. Maintain these temperatures.
5. When the test temperatures stabilize, run for one hour and monitor the maximum
temperature of the test bearing.
6. Record the highest bearing temperature.
7. Shut off bearing drive motor.
8. Repeat step 5 of the shutdown procedure.
6.7 Demerit system for rating deposits in Erdco bearing machine.
6.7.1 Outline of method.
6.7.1.1 Cleanliness demerits. Bearing head cleanliness shall be reported in this demerit
system by the assignment of values of 0 to 20 to the inspection results, as follows:
0 shall designate a new or thoroughly clean condition.
20 shall represent the worst condition that could be expected.
6.7.1.2 Table III shows the numerical demerits to be assigned to different types and
degrees of deposits:
TABLE III. Deposit rating demerit scale
Type of deposit
Degree
Demerit values
Flaked carbon
Heavy
20
Moderate
19
Light
18
17
Blistered carbon
Heavy
Moderate
16
Light
15
Heavy
14
Crinkled
Moderate
13
Light
12
Smooth carbon
Heavy
11
Moderate
10
9
Light
Sludge
Heavy
8
Moderate
7
Light
6
Varnish
Heavy
5
Moderate
3
Light
1
135
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