DRUM 3P0331 - Caterpillar

1. Remove the panel and louvers from the frame assembly.2. Put two pieces of cardboard or sheet metal between the rotor assembly and the stator assembly. This will keep the rotor off of the stator when the cover assembly is removed. 3. Remove four bolts (2) and the retainers that hold the bearing.4. Remove six bolts (1) that hold the cover on the stator. Remove the wires F1 and F2 from the regulator assembly. 5. Install two guide bolts (4) with 1/2"-13 NC threads, 10 in. (250 mm) long.6. Install two 3/8"-16 NC forcing bolts (3) in the threaded holes in cover. Push the cover from the bearing and remove the cover with a hoist.
Do not damage the stationary exciter field, which is part of the cover, when the cover is removed.
7. Remove ring (6) that holds bearing (5) on the shaft. 8. Install tool group (A) and remove the bearing from shaft.
Do not damage the armature of the exciter when the tool group is installed.
After the bearing has been removed, the armature of the exciter can be removed. The armature windings will be destroyed.Install Generator Bearing
If the armature of the exciter has been removed, press the replacement armature on the rotor shaft using a pipe with approximately an I.D. and O.D. of the rotor shaft O.D. and armature winding I.D. respectively. The rotor shaft has a taper and keyway.1. Heat the bearing in oven to a maximum temperature of 225°F (107°C). 2. Install bearing (1) on the shaft.3. Install the ring that holds the bearing on the shaft.4. Install two guide bolts with 1/2"-13 NC threads, 10 in. (250 mm) long, in the generator. Install the cover assembly on the two guide bolts. Slide the cover into position over the bearing.
Do not damage the exciter fields and armature when cover is installed.
5. Install the bolts that hold the cover on the generator. 6. Install retainers (2) and bolts that hold the bearing in the cover.7. Connect the two field wires F1 and F2 to the regulator assembly terminal strip.8. Remove the cardboard or sheet metal that was used to keep the rotor off of the stator.9. Fill the bearing chamber with lubricant. See Lubrication and Maintenance Guide.10. Install the louvers in the end of the generator frame. Install the panel in the frame.