TUBE AS 3904702 - Caterpillar

Measuring Rolling Torque
(A) Torque wrench. (B) Direction of pull. (C) Viewed standing here.1. Use a torque wrench as illustrated above to determine the rolling torque created by the seal and boot. A typical rolling torque value is 3.4 N m (30 lb in).1. After seal (1), boot (2) and bearing cone (3) have been installed in hub (9), install spindle (8) into hub (9). Hold the spindle stationary and use a torque wrench as illustrated above to determine the rolling torque created by the seal and boot. A typical rolling torque value is 3.4 N m (30 lb in). Bearing cones (3) and (4) should be clean and wiped dry of any lubricating oil. Bearing cones which have oil present will affect rolling torque readings.2. Heat shaft bearing cone (4) in an oven to 135°C (275°F). Press in the shaft bearing cone until the rolling torque increases 1.7 to 4.5 N m (15 to 40 lb in) greater than the value measure in Step (A). It will be necessary to continually rotate the housing to seat the bearing cone in order to obtain a correct rolling resistance.3. Apply 9S3263 Thread Lock to the threads of the locknut. Install washer (5), lock tanged washer (6) and locknut (7).4. Tighten the locknut with a torque wrench to 306 N m (225 lb ft). Rotate hub (9) to seat the bearings.5. Recheck the rolling torque. The final reading should be 1.7 to 4.5 N m (15 to 40 lb in) greater than the value measure in Step (A).6. A final rolling torque of 5 to 7 N m (45 to 65 lb in) should result in a bearing preload of .025 to .051 mm (.0010 to .0020 in).7. If the lockwasher tang does not line up with the locknut slot, tighten the locknut to line up the tang and bend into the locknut slot.(10) Torque for eight bolts ... 20 to 25 N m (15 to 20 lb ft) Four shoulder bolts (2) are equally spaced.(11) Torque for four shoulder bolts ... 20 to 25 N m (15 to 20 lb ft)