ASTM D5182 Evaluating the Scuffing Load Capacity of Oils (FZG Visual Method)
8. Hazards
8.1 (Warning - This test method involves the use of highly loaded gears and shafts turning at high speeds. Appropriate precautions must be taken to protect personnel (see Annex A1.2).)
9. Preparation of Apparatus
9.1 Test Gears - The test gears are cleaned with Stoddard solvent to remove all of the protective coating. In some cases this requires brushing (soft bristle brush) of the gears to remove excess amounts of the coating material. Each gear is to be dried and then visually inspected for any evidence of damage or corrosion on the tooth flank surfaces. In such cases where damage or corrosion is found these gears should not be used for test purposes.
9.2 Test Gearbox - The test gearbox and bearings shall be washed thoroughly with Stoddard solvent to remove the previous test oil. (This can be done at the termination of a test after the oil has been drained from the gearbox and prior to disassembling the test gears.) It is recommended that the gearbox be flushed twice with Stoddard solvent to remove all traces of the previous test oil. After draining the solvent from the test gearbox the unit should be air dried to remove all traces of solvent. (Warning - Be sure the gearbox temperature has decreased below 60°C prior to adding the Stoddard solvent.)
9.3 Assembly of Test Gears - The test gears, spacers, and bearings are heated on a hot plate or other device to approximately 60 to 80°C. Install the test gears on the shafts with the alignment marks in the position shown in Fig. 3. Complete the assembly of the gearbox with the appropriate spacers, bearings, and front cover.
9.3.1 It has been found critical for correct results that the test gears are properly aligned on their respective shafts. (Warning - Misalignment can lead to erratic or lower fail loads due to uneven distribution of the load on the tooth.)
9.4 Test Oil - Add 1.25 L of test oil to the test gearbox (approximately to the centerline of the shafts).
9.5 Final Assembly - Secure the top of the test gear case in place with the 6 bolts. Connect the heater to its power source.
