LATCH AS-CAB 1293735 - Caterpillar

Illustration 1 g03322746
Rectifier Assembly mounted to drive end view of exciter rotor (1) Exciter Rotor lead wire and lug (2) Rectifier assembly (mounted to aluminum plate by four screws: aluminum plate, under rectifier assembly, mounted to exciter rotor laminations by three thread-forming screws)
Illustration 2 g03322747
Exciter Rotor shown from nondrive end view of generator (3) Balance weight (located in slots)Perform the following steps when repairing or replacing the rectifier assembly and/or exciter rotor:High voltage may be present. The power source must be disconnected before working on the equipment. Failure to disconnect the power source could result in injury or death. Verify that the equipment is not energized before performing any maintenance. This work must be performed by trained personnel with correct tools and procedures.
Shorten each of six rectifier leads. Refer to Illustration 1.
Replace lugs with stronger construction lugs, such as 6B-2864 Terminal .
Inspect integrity of aluminum rectifier assembly plate mounting to the exciter rotor laminations.
If the aluminum rectifier assembly plate is found not to be firmly mounted to the exciter rotor laminations, re-tap three new holes into the exciter rotor laminations and mount plate firmly or replace the exciter rotor assembly and plate.
The mounting hardware used are three thread-forming screws and the integrity of mounting requires holes to be new.
If the exciter rotor is removed to make repair or for replacement, care must be taken to assure the combination exciter rotor and main rotor assembly are mechanically balanced.Note: The exciter rotor for this design generator is not balanced as a separate component. Full confidence in mechanical balance can only be 100% achieved, if balanced with a balancing machine. Alternatively, an acceptable level of balance can be achieved by removing weights from the original exciter rotor, and installing the weights in the exact same position on the replacement exciter rotor.Note: Accessing of weights inside the exciter rotor is done only by removing the cover plate that is riveted to the exciter rotor at the non-drive end view of the generator (not by removing the aluminum rectifier assembly plate mounted on the drive end of the exciter).The improved exciter rotor design is adaptable to and effective with the serial numbers that are listed in Table 1.
Table 1
Sales Model     Adaptable Serial Number     Effective Serial Number    
3406     S/N:NKM1-499     S/N:NKM500-UP    
S/N:ZKC1-202 S/N:ZKC203-UP    
3456     S/N:C1G1-1671     S/N:C1G1672-UP    
S/N:C2T1-482 S/N:C2T483-UP    
S/N:C3G1-1417 S/N:C3G1418-UP    
S/N:C4G1-1070 S/N:C4G1071-UP    
3406C     S/N:C2G1-9715     S/N:C2G1916-UP    
S/N:C2Y1-2504 S/N:C2Y-2505UP    
S/N:C5G1-3724 S/N:C5G3725-UP    
S/N:C8G1-1164 S/N:C8G1165-UP    
C15 GEN SET     S/N:C5E1-3850     S/N:C5E3851-UP    
S/N:C5H1-2850 S/N:C5H2851-UP    
S/N:C5L1-6292 S/N:C5L6293-UP    
S/N:CYY1-1671 S/N:CYY1672-UP    
S/N:NKL1-499 S/N:NKL500-UP    
S/N:STG1-279 S/N:STG280-UP    
S/N:T4A1-659 S/N:T4A660-UP    
S/N:X4R1-666 S/N:X4R667-UP    
S/N:ZKA1-123 S/N:ZKA124-UP    
C15 PET GS ENG     S/N:PET1-370     S/N:PET371-UP    
C18     S/N:ZKB1-123     S/N:ZKB124-UP    
C18 GEN SET     S/N:C6C1-733     S/N:C6C734-UP    
S/N:DKE1-556 S/N:DKE557-UP    
S/N:EKW1-1520 S/N:EKW1521-UP    
S/N:G4C1-4926 S/N:G4C4927-UP    
S/N:G4C1-299 S/N:M1Y300-UP    
S/N:M1Z1-1921 S/N:M1Z1922-UP    
S/N:N1C1-538 S/N:N1C539-UP    
S/N:N1D1-818 S/N:N1D819-UP    
S/N:NKK1-111 S/N:NKK112-UP    
S/N:PEJ1-216 S/N:PEJ217-UP    
S/N:STD1-229 S/N:STD230-UP