FED-STD-791D
Method 3430.2
September 30, 1986
COMPATIBILITY CHARACTERISTICS OF UNIVERSAL GEAR LUBRICANTS
1. SCOPE
1.1 This method is used for determining the compatibility of a universal gear lubricant
when blended with a reference gear lubricant by observing for precipitation of additive material
after storage.
2. SUMMARY
2.1 The test consists of mixing the reference gear and test gear lubricants, storing the
mixture for 30 days, and centrifuging the mixture to determine the percentage of sludge present.
3. SAMPLE SIZE
3.1 Approximately 4 L (1 gal) of the gear oil to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 100 mL cone-shaped centrifuge tubes as in ASTM D 96.
4.2 Centrifuge with a diameter of swing (tip-to-tip of whirling tubes) 38.1 to 43.2 cm (15
to 17 in) and shall be capable of being controlled at a speed of 1500 " 25 rpm.
NOTE 1:
If the available centrifuge does not conform dimensionally to the preferred form,
the speed of rotation of the available centrifuge must be adjusted to give the same
centrifugal force at the tips of the tubes as that obtained with the prescribed
instrument when operated at 1500 " 25 rpm. The speed to operate the available
centrifuge shall be calculated from the formula.
rpm = y * 1500
where:
y = The 40.7 divided by the diameter in cm of the swing (tip-to-tip of the whirling tubes) of
the available centrifuge. Use 16 as the dividend when the diameter is measured in
inches.
4.3 Balance capable of weighing to "1 mg.
150
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