G3B, K3A and L3A Denso Alternators Caterpillar


Alternator

Usage:

426C 1CR



Illustration 1g00469612

Alternator Front View G3B Series (12 Volt 55 Amp)




Illustration 2g00469622

Alternator Side View G3B Series (12 Volt 55 Amp)




Illustration 3g00469623

Alternator Rear View G3B Series (12 Volt 55 Amp)

Table 1
Alternator Specifications    
Caterpillar Part Number     105-2811     105-2812     144-9952     144-9954    
Denso Part Number     101211-2240     101211-2310     101211-2780     101211-2770    
Caterpillar Reman. Part Number     0R4327     0R9273            
Slip Ring Outer Diameter Standard     14.4 mm     14.4 mm     14.4 mm     14.4 mm    
Slip Ring Outer Diameter Service Limit     14.0 mm     14.0 mm     14.0 mm     14.0 mm    
Brush Length Standard     10.5 mm     10.5 mm     10.5 mm     10.5 mm    
Brush Length Service Limit     4.5 mm     4.5 mm     4.5 mm     4.5 mm    
Pulley Nut Torque     94 - 127 Nm     94 - 127 Nm     94 - 127 Nm     94 - 127 Nm    
Belt Tension     356 - 444 N (1)     356 - 444 N (1)     356 - 444 N (1)     356 - 444 N (1)    
Battery Terminal Torque     5.9 - 8.9 Nm     5.9 - 8.9 Nm     5.9 - 8.9 Nm     5.9 - 8.9 Nm    
Denso Series     G3B     G3B     G3B     G3B    
Voltage Rating     12V     12V     12V     12V    
Polarity     Frame Ground     Frame Ground     Frame Ground     Frame Ground    
Minimum Output Current (Cold) at 5000 rpm     50A     50A     50A     50A    
Regulating Voltage     14.2 ±.6     14.2 ±.6     14.2 ±.6     14.2 ±.6    
Rotor Coil Resistance     2.9 ohms     2.9 ohms     2.9 ohms     2.9 ohms    
Rotation     CW     CW     CW     CW    
( 1 ) Initial Value. Readjustment Value Is 157 - 314 N.



Illustration 4g00481225

Alternator Front View K3A Series (12 Volt 90 Amp)




Illustration 5g00481224

Alternator Front View K3A Series (12 Volt 90 Amp)




Illustration 6g00481226

Alternator Front View K3A Series (12 Volt 90 Amp)

Table 2
Alternator Specifications    
Caterpillar Part Number     105-2813     105-2814     144-9963     144-9964    
Denso Part Number     101211-9020     101211-9010     N/A     N/A    
Caterpillar Part Number     0R9274     0R4328            
Slip Ring Outer Diameter Standard     14.4 mm     14.4 mm     14.4 mm     14.4 mm    
Slip Ring Outer Diameter Service Limit     14.0 mm     14.0 mm     14.0 mm     14.0 mm    
Brush Length Standard     10.5 mm     10.5 mm     10.5 mm     10.5 mm    
Brush Length Service Limit     4.5 mm     4.5 mm     4.5 mm     4.5 mm    
Pulley Nut Torque     94 - 127 Nm     94 - 127 Nm     94 - 127 Nm     94 - 127 Nm    
Belt Tension     356 - 444 N (1)     356 - 444 N (1)     356 - 444 N (1)     356 - 444 N (1)    
Battery Terminal Torque     5.9 - 8.9 Nm     5.9 - 8.9 Nm     5.9 - 8.9 Nm     5.9 - 8.9 Nm    
Denso Series     K3A     K3A     K3A     K3A    
Voltage Rating     12V     12V     12V     12V    
Polarity     Frame Ground     Frame Ground     Frame Ground     Frame Ground    
Minimum Output Current (Cold) At 5000 rpm     81A     81A     81A     81A    
Regulating Voltage     14.2 ±.6     14.2 ±.6     14.2 ±.6     14.2 ±.6    
Rotor Coil Resistance     2.9 ohms     2.9 ohms     2.9 ohms     2.9 ohms    
Rotation     CW     CW     CW     CW    
( 1 ) Initial Value. Readjustment Value Is 157 - 314 N.



Illustration 7g00481228

Alternator Front View L3A Series (24 Volt 60 Amp)




Illustration 8g00481227

Alternator Front View L3A Series (24 Volt 60 Amp)




Illustration 9g00481229

Alternator Front View L3A Series (24 Volt 60 Amp)

Table 3
Alternator Specifications    
Caterpillar Part Number     3E-7772    
Denso Part Number     101211-7920    
Slip Ring Outer Diameter Standard     14.4 mm    
Slip Ring Outer Diameter Service Limit     14.0 mm    
Brush Length Standard     10.5 mm    
Brush Length Service Limit     4.5 mm    
Pulley Nut Torque     94 - 127 Nm    
Belt Tension     356 - 444 N (1)    
Battery Terminal Torque     5.9 - 9.8 Nm    
Denso Series     L3A    
Voltage Rating     24V    
Polarity     Frame Ground    
Minimum Output Current (Cold) At 5000 RPM     54A    
Regulating Voltage     28 ±1    
Rotor Coil Resistance     12 ohms    
Rotation     CW    
( 1 ) Initial Value. Readjustment Value Is 157 - 314 N.



Illustration 10g00517877

Circuit Diagram For Denso G3B, K3A, And L3A Alternators

(1) Stator Coil. (2) Rotor Coil. (3) Lamp

Do not connect the "L" and "B" terminal directly. A lamp (3) must be connected in between "L" and "B" .

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