HOUSING 2A2145 - Caterpillar

--------------- END SUPPLEMENT ---------------A new assembly and bearing adjustment procedure is now used for the final drives in 245 Excavators and 245 Front Shovels. The new procedure will increase the service life of the final drives. Change the procedure in the 245 Service Manual, Vehicle Systems Disassembly and Assembly, Form No. SENR7339. Use the information that follows to change Steps 21 through 40 on Pages 211 thru 213.
21. Install bearing cage (14) on the final drive cover without shims and O-ring seal. Tighten the bolts with your fingers (finger tight) only.
Illustration 1. Location of shafts in final drive. Make sure the bearings for the idler gears are loose.22. Heat the bearing cones for the input pinion to a maximum temperature of 135°C (275°F). Install the bearing cones on the input pinion.23. Put the input pinion in position in the final drive.24. Install the sprocket retainer and bolt on the sprocket shaft.25. Lower the temperature of the bearing cup for cage (14). Install the cup in the cage. See Illustration 2.
Illustration 2. Installation of bearing cage.26. Install cage (14) on the cover without shims and O-ring seal. Install two bolt (16) with flat washers, 180° apart. Use two 5/8"-11 NC bolts × 51 mm (2.0") long. Tighten the bolts to a torque of 14 N m (120 lb in).27. Turn the sprocket shaft and then check the torque on bolts (16). The torque for bolts (16) must be 14 N m (120 lb in). Do this step until the torque on the bolts is 14 N m (120 lb in) after the sprocket shaft has been turned.28. Measure the distance between cage (14) and the housing at the bolt locations with a feeler gauge. Find the average of these two dimensions. Use this dimension and the correction factor from the chart to get the total thickness of shims needed.29. Remove bearing cage (14) from the cover.30. Install the O-ring seal on bearing cage (14). Install the shims, bearing cage (14) and the bolts. The cage must be installed with the oil hole in the cage in alignment with the oil hole in the housing.31. Do Steps 26 thru 30 for the first and second reduction shafts.32. Loosen the bolts that hold the sprocket shaft cage in position. Tighten the bolts finger tight.33. Use a torque wrench on the nut on the end of the sprocket shaft to turn the shaft at a constant speed and record the torque value shown to turn the shaft. See Illustration 3.
Illustration 3. Check torque needed to turn sprocket shaft.34. Do Steps 26 thru 30 for the sprocket shaft. Remember to subtract the correction factor for the sprocket shaft shims.35. Check the torque that is needed to turn the sprocket shaft. The desired torque is 16 to 30 N m (12 to 22 lb ft) more than the value found in Step 33. If the torque is too low, remove shims until the torque is within the desired range. The torque range in Step