SPACER 9Y4578 - Caterpillar

Disassembly Procedure
Start By:
Remove the alternator from the machine. Refer to Disassembly and Assembly, "Alternator - Remove" for the machine that is being serviced.Note: Before disassembly, clean the exterior of the alternator in order to prevent dirt from entering the unit.
Illustration 1 g00825749
Remove the pulley nut, the washer, the pulley, the key, and the fan.
For proper alignment during assembly, mark the front frame, the stator, and the rear frame.
Remove four bolts (1). Remove front frame (3) from rear frame (4). The rotor remains connected to the front frame. Stator (5) remains connected to the rear frame.
Remove four bolts (2). Remove the rotor from the front frame.
Illustration 2 g00825750
Remove spacer (9), front felt washer (12), washer (11), ball bearing (8), plate (7), the rear felt washer, the rear spacer, and plate assembly (10). Remove two ball bearings (6) .
Illustration 3 g00825751
Remove the rear cover.
For proper assembly, mark all wires. Disconnect wire (16). Disconnect wire (14) and remove wire (14). Disconnect field winding lead (13) .
Remove the two bolts. Remove capacitor (17). Remove regulator (15) .
Disconnect stator leads (18). Lift rear frame (4) from the stator.
Illustration 4 g00825752
Loosen "B+" terminal nut (20) and loosen "B-" terminal nut. Remove four bolts (22). Remove rectifier (23). Remove "R" terminal (19) .
Illustration 5 g00825753
For proper assembly, mark the locations of field winding leads (13) in the rear frame. Remove three bolts (25). Remove field winding (24) from the rear frame.
Illustration 6 g00825227
Alternator Components (2) Bolts (3) Front frame (4) Rear frame (5) Stator (6) Ball bearings (7) Plate (8) Ball bearing (9) Spacer (10) Plate assembly (11) Washer (12) Felt washer (13) Field winding leads (15) Regulator (17) Capacitor (18) Stator leads (22) Bolts (23) Rectifier (24) Field winding (25) Bolts (26) Rotor