ASTM D4998-13 (R2021) pdf free download.Standard Test Method for Evaluating Wear Characteristics of Tractor Hydraulic Fluids.
1.1 This test method is used to screen lubricants for gear wear. It is primarily applicable to tractor hydraulic fluids hut may be suitable for other applications.
1.2 The values stated in SI units are to he regarded as standard. No other units of measurement are included in this standard.
9. Procedure
9. 1 FZG Test Machine Assemblv6—Assemble the test machine according to the instructions given in Section 3,5 except employ a modified, low speed drive motor as described in Annex Al.
Note 1—In addition to other precautions. machinery guards are supplied with the FZG test machine to protect personnel from hatards assxiated with rotating machinery. These should be properly installed before operating the equipment.
Nom 2—In addition to other precautions, the electrical connections for the drive motor and heater should he installed in accordance with the current edition of the National Electrical Code.
9.2 Machine cleaning—Flush the test gear case and associated parts with mineral spirits solvent (see 7.1). (Warning— Combustible. Vapor harmful. Keep away from heat, sparks. and open flame. Keep container closed. Use with adequate ventilation. Avoid prolonged breathing of vapor or spray mist. Avoid prolonged or repeated skin contact.) Fill the gear case with mineral spirits solvent to a level that is above the shaft center line. Manually rotate the shafts so that the bearings are rinsed. Drain mineral spirits solvent from the gear case. Refill gear case with fresh mineral spirits solvent, manually rotate shafts, and drain. Dry gear case with compressed air.
9.3 Gear Condition—Examine the gear tooth faces with a magnifying lens of 3 to 6 power. Do not use gears with imperfections on the tooth faces.
9.4 Gear Cleaning—Wash the test gears in mineral spirits solvent, then acetone (see 7.2), and finally in pentane (see 7.3). After cleaning, handle the gears only with clean tongs or with clean gloves. Allow the gears to dry. To prevent water condensation following gear cleaning, carefully warm the gears to room temperature with a clean, steam hot plate or bearing heater with surface temperature below 75 °C.
9.5 Gear Weighing—Weigh the individual gears using an analytical balance. The gears shall be clean, dry, and at ambient temperature. Record the mass of each gear, rounding to the nearest milligram. Add the mass of each gear and record the sum as initial total gear mass (TM1).
9.6 Gear Ins tallation—Install the test gears.
9.7 Test Procedure—Fill the gear case with test fluid until level with the shaft centerline. Install all machine guards in their proper operating positions. Set the temperature controller to 121 °C. With the heater on and no torque applied, start motor to run at 100 r/min test speed. When temperature stabilizes at (121 ± 3) °C for (20 to 25) mm, stop the motor and apply a tenth stage load.ASTM D4998 pdf download.