ENGINE AR 3197261 - Caterpillar

Illustration 2 g00620650
Side View of the 26-SI Alternator
Illustration 3 g00620651
Rear View of the 26-SI Alternator
Table 1
Specifications for 26-SI Alternators    
Part Number
Remanufactured Part Number    3E-7577
OR-3615    3E-7578
OR-5206    112-5041
OR-5206    3E-7892
OR-3616    
Voltage Rating     24V     24V     24V     12V    
Current     75A     50A     50A     85A    
Application     Extra Heavy Duty     Extra Heavy Duty     Heavy Duty     Extra Heavy Duty    
Weight     12.5 kg (27.6 lb)    
12.5 kg (27.6 lb)    
12.5 kg (27.6 lb)    
12.5 kg (27.6 lb)    
Polarity     Negative Case Ground     Negative Case Ground     Negative Case Ground     Negative Case Ground    
Minimum Full Load Current (Cold) at 5000 rpm     67A     47A     47A     77A    
Minimum Full Load Current (Cold) at 1500 rpm     29A (1) (2)     18A     18A     38A    
Amperes at
27 °C (80 °F)and 1800 rpm     45     33     33     56    
Amperes at
27 °C (80 °F) and 5000 rpm     75     50     50     85    
Rotation (3)     CW
CCW     CW
CCW     CW
CCW     CW
CCW    
( 1 ) Minimum Full Load Current (Cold) at 2000 rpm
( 2 ) The minimum speed of the alternator should be 1800 rpm at low engine idle.
( 3 ) The rotation is viewed from the pulley.The results for a 12 volt 26-SI Alternator's rotor field winding test at 27 °C (80 °F) are in the following list:
3.0 to 4.3 Amperes
2.8 to 4.0 OhmsThe results for a 24 volt 26-SI Alternator's rotor field winding test at 27 °C (80 °F) are in the following list:
2.0 to 2.8 Amperes
8.5 to 12.0 Ohms
Table 2
Torque Specifications for the 26-SI Alternator    
Part Number
Remanufactured Part Number    3E-7577
OR-3615    3E-7578
OR-5206    112-5041
OR-5206    3E-7892
OR-3616    
Pulley Nut    
102 7 N m (75 5 lb ft)    
102 7 N m (75 5 lb ft)    
102 7 N m (75 5 lb ft)    
102 7 N m (75 5 lb ft)    
Cover for the Rectifier    
5.3 N m (47 lb in)    
5.3 N m (47 lb in)    
5.3 N m (47 lb in)    
5.3 N m (47 lb in)    
Cover Plate
Regulator and Mounting Plate
Heat Sink    
3 N m (27 lb in)    
3 N m (27 lb in)    
3 N m (27 lb in)    
3 N m (27 lb in)    
Battery Terminal    
13.5 1.3 N m (119.5 11.5 lb in)    
13.5 1.3 N m (119.5 11.5 lb in)    
13.5 1.3 N m (119.5 11.5 lb in)    
13.5 1.3 N m (119.5 11.5 lb in)    
"R" Terminal
Nut for the Regulator Stud    
2 N m (18 lb in)    
2 N m (18 lb in)    
2 N m (18 lb in)    
2 N m (18 lb in)    
Nut for