26SI Series Alternator Caterpillar

Alternator

Usage:

769C 01X

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Illustration 1	g00620646
Front View of the 26-SI Alternator

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Illustration 2	g00620650
Side View of the 26-SI Alternator

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Illustration 3	g00620651
Rear View of the 26-SI Alternator

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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

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^( 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:

The results for a 24 volt 26-SI Alternator's rotor field winding test at 27 °C (80 °F) are in the following list:

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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 the Hex Mounting Bolt Bolt for the Adjusting Lug	88 N·m (65 lb ft)	88 N·m (65 lb ft)	88 N·m (65 lb ft)	88 N·m (65 lb ft)
Frame Bolts	6.2 N·m (55 lb in)	6.2 N·m (55 lb in)	6.2 N·m (55 lb in)	6.2 N·m (55 lb in)
Ground Screw	6 N·m (55 lb in)	6 N·m (55 lb in)	6 N·m (55 lb in)	6 N·m (55 lb in)