10. Procedure
10.1 With the reservoir of grease packer resting on a clean bench top, and while wearing gloves, place bearing cup with small diameter face down into the recess of the packer. Place the bearing cone over the cup, and while holding the bearing assembly against the packer, lift and invert the whole unit and return it to the bench.
10.2 Fill the reservoir with the grease sample, and use the plunger to force grease through the bearing. Carefully remove the plunger from the reservoir to avoid sucking air into the bearing, and slide the packer unit over the edge of the bench. While holding the bearing assembly in the packer, invert the unit to its original position on the bench.
10.3 Using a small square-ended spatula, remove excess grease from the bearing bore and the annulus between the grease packer and outer perimeter of the bearing cup. The bearing is removed from the packer by either use of the pliers or by placing gloved index finger in the bore and lifting out. While holding the bearing, use the spatula to remove excess grease above the cage on both sides of the bearing. This procedure is done to ensure that approximately the same volume of grease is used each time.
10.4 Using Fig. 1 as a guide, hold the packed bearing between gloved fingers with large inside diameter of cup downward and insert the small diameter plastic flange on top of the bore, and the larger flange into the bottom of the bore. Slide the bearing assembly onto the 1-kg weight so that the large diameter flange fits into the recess on the top of the weight. Insert the bolt through the assembly and screw the bolt tightly into the weight. Lower the plastic bearing holder (Part 8) over the bearing (the large O ring faces upward). Press down the holder so that the bearing fits squarely into the holder.
10.5 Invert a plastic jar over the bearing assembly. Slide the two components over the edge of the bench, and with fingers pressing the weight against the inner bottom of the jar, invert the entire assembly.
10.6 Place the jar onto the base of the motor driven spindle and center under the indexing pin of the drive. Start the motor and bring the drive into the center of the 1-kg weight and load until the nut hits the depth stop. Run for 60 s, raise the drive, and allow the bearing to coast to a stop. Extreme care should be taken not to break the contact between the races and rollers at this point and in the following steps.
10.6.1 At no time during or after the 60 s run shall the grease be redistributed or forced back into the bearing.
10.7 Freshly boil the distilled water for 10 more or less 5 min to remove carbon dioxide and cool to 25 more or less 5°C.
10.8 Fill a clean syringe with 100 more or less 5 mL of distilled water from 10.7. With the run-in bearing in the jar, simultaneously start a timer and begin adding the water into the hole provided for this purpose in the bearing holder. Add the 100 mL of water within 20 more or less 3 s. When the timer shows 50 more or less 3 s start withdrawing the water. When the timer shows 60 more or less 3 s, complete the withdrawal of 70 more or less 5 mL of water. Leave the remaining 30 more or less 5 mL of water in the jar. Make sure that water does not touch the bearing after 70 more or less 5 mL is withdrawn. It may be difficult to withdraw 70 more or less 5 mL water in 10 s using a 16 gage needle. A larger needle may be required.
10.9 Screw the cap on the jar and transfer to a dark oven essentially free from vibration for 48 h at 52 more or less 1°C.
10.10 Prepare three bearings with each grease to be tested. Each group of three bearings is one test.
