RA1.2, R1.4, R2.0, R2.2, R2.5, R2.7, R3.0, R4.5 and R5.5 Series Reduction Starting Motors Caterpillar


Electric Starting Motor

Usage:

426C 1CR



Illustration 1g00553157

R5.5 Series - Side View

(1) Commutator.

(2) Through bolts.

(3) Brushes.

(4) Battery terminal nut.

(5) Ground terminal nut.

(6) Drive housing screws.

(7) Switch terminal screw.

(8) Solenoid cover bolts.




Illustration 2g00553165

R5.5 Series - End View

(2) Through bolts.

(4) Battery terminal nut.

(5) Ground terminal nut.

(7) Switch terminal screw.

(8) Solenoid cover bolts.

(9) Motor terminal nut.

Table 1
Starting Motor Coverage    
Part No.     Consist No.    
RA1.2 Series (12V)    
160-4648     None    
R1.4 Series (12V)    
3E-5128     None    
3E-5129 (1)     None    
3T-5128     None    
3T-5649 (1)     None    
3T-8209 (1)     None    
3T-8210 (1)     None    
3T-8211 (1)     None    
6T-7002 (1)     None    
6T-7004 (1)     None    
7X-1057 (1)     None    
R2.0 Series (12V)    
3E-5127     None    
3E-5130 (1)     None    
3T-8208 (1)     None    
6T-7003 (1)     None    
144-9966     None    
R2.2 Series (12V)    
155-9849     None    
R2.5 Series (12V)    
3E-0079 (1)     None    
7C-2264 (1)     8T-8619    
7C-4622 (1)     None    
6T-7001 (1)     None    
143-0535 (1)     None    
143-0536 (1)     None    
143-0537     None    
R2.7 Series (12V)    
3E-7905 (1)     None    
6V-0492 (1)     None    
143-0538     None    
144-9955     None    
R3.0 Series (12V)    
3E-5382     None    
9W-2946 (1)     None    
105-3133     None    
R4.5 Series (24V)    
8C-5580 (1)     None    
100-6929 (1)     None    
143-0540     None    
143-0541     None    
R5.5 Series (24V)    
3E-5381     None    
9W-3748 (1)     None    
9X-1301     None    
105-3134 (1)     None    
111-9861     None    
( 1 ) Discontinued, not serviced, or pending discontinued.

Part numbers for the electric starting motors are shown in table 1. The Consist Number is required when you are ordering various electric starting motors. The 9W-3748 Electric Starting Motor and 6T-7003 Electric Starting Motor are referenced in this module.

Table 2
STARTING MOTOR SPECIFICATIONS    
Series     RA1.2     R1.4     R2.0     R2.2    
RATED VOLTAGE     12V     12V     12V     12V    
SOLENOID:    
Pull-In Winding Resistance     .33Ω     .36Ω     .36Ω     .36Ω    
Hold-In Winding Resistance     .88Ω     .85Ω     .85Ω     .95Ω    
Pull-In Winding Current     36.4A at 12V     33.3A at 12V     33.3A at 12V     33.3A at 12V    
Hold-In Winding Current     13.6A at 12V     14.1A at 12V     14.1A at 12V     12.6A at 12V    
Starting Motor No Load Test:    
Voltage     11.5V     11.5V     11.5V     11.5V    
Current (max)     90A     90A     120A     120A    
Speed (min)     3000rpm     3500rpm     4000rpm     4000rpm    
Starting Motor Load Test:    
Voltage     8.0V     8.5V     7.5V     7.5V    
Current (max)     280A     350A     500A     500A    
Speed (min)     900rpm     1000rpm     1300rpm     1400rpm    
Commutator (1):    
Diameter (new)     30 mm (1.18 inch)    
30 mm (1.18 inch)    

35 mm (1.38 inch)    

35 mm (1.38 inch)    
Diameter (min)    
29 mm (1.14 inch)    

29 mm (1.14 inch)    

34 mm (1.34 inch)    

34 mm (1.34 inch)    
Mica Depth (min)    
0.20 mm (0.008 inch)    

0.20 mm (0.008 inch)    

0.20 mm (0.008 inch)    

0.20 mm (0.008 inch)    
Total Indicator Runout (max)    
0.05 mm (0.002 inch)    

0.05 mm (0.002 inch)    

0.05 mm (0.002 inch)    

0.05 mm (0.002 inch)    
Brush (3):    
Length (new)    
15.5 mm (0.61 inch)    

15 mm (0.59 inch)    

15 mm (0.59 inch)    

16.5 mm (0.65 inch)    
Length (min)    
10 mm (0.39 inch)    

10 mm (0.39 inch)    

10 mm (0.39 inch)    

10 mm (0.39 inch)    
Torques:    
Battery Terminal Nut (4)    
5.9 N·m (52 lb in)
to

11.8 N·m (104 lb in)    

8 N·m (71 lb in)
to

14 N·m (125 lb in)    

8 N·m (71 lb in)
to

14 N·m (125 lb in)    

17.7 N·m (157 lb in)
to

24.5 N·m (217 lb in)    
Ground Terminal Nut (5)     None     None     None     None    
Switch Terminal Screw (7)    
2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

1.18 N·m (10.5 lb in)
to

1.77 N·m (15.7 lb in)    

1.18 N·m (10.5 lb in)
to

1.77 N·m (15.7 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    
Motor Terminal Nut (9)    
5.9 N·m (52 lb in)
to

9.8 N·m (87 lb in)    

5.9 N·m (52 lb in)
to

9.8 N·m (87 lb in)    

3.9 N·m (35 lb in)
to

6.9 N·m (61 lb in)    

3.9 N·m (35 lb in)
to

6.9 N·m (61 lb in)    
Through Bolts (2)    
4.5 N·m (40 lb in)
to

7.3 N·m (65 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

10.8 N·m (96 lb in)
to

14.7 N·m (130 lb in)    
Solenoid Cover Bolts (8)    
1.8 N·m (16 lb in)
to

3.2 N·m (28 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    
Drive Housing Screws (6)    
4.5 N·m (40 lb in)
to

7.3 N·m (65 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

Table 3
STARTING MOTOR SPECIFICATIONS    
Series     R2.5     R2.7     R3.0     R4.5     R5.5    
RATED VOLTAGE     12V     12V     12V     24V     24V    
SOLENOID:    
Pull-In Winding Resistance     .22Ω     .22Ω     .22Ω     .80Ω     .80Ω    
Hold-In Winding Resistance     .66Ω     .66Ω     .66Ω     2.15Ω     2.15Ω    
Pull-In Winding Current     54.5A at 12V     54.5A at 12V     54.5A at 12V     30A at 24V     30A at 24V    
Hold-In Winding Current     18.2A at 12V     18.2A at 12V     18.2A at 12V     11.2A at 24V     11.2A at 24V    
Starting Motor No Load Test:    
Voltage     11.0V     11.0V     11.0V     23.0V     23.0V    
Current (max)     200A     200A     220A     90A     120A    
Speed (min)     3000rpm     3000rpm     4200rpm     3500rpm     3800rpm    
Starting Motor Load Test:    
Voltage     8.0V     8.0V     7.0V     17.0V     16.0V    
Current (max)     600A     600A     890A     530A     690A    
Speed (min)     1100rpm     1130rpm     940rpm     950rpm     900rpm    
Commutator (1):    
Diameter (new)    
36 mm (1.42 inch)    

36 mm (1.42 inch)    

43 mm (1.69 inch)    

36 mm (1.42 inch)    

43 mm (1.69 inch)    
Diameter (min)    
35 mm (1.38 inch)    

35 mm (1.38 inch)    

42 mm (1.65 inch)    

35 mm (1.38 inch)    

42 mm (1.65 inch)    
Mica Depth (min)    
0.20 mm (0.008 inch)    

0.20 mm (0.008 inch)    

0.20 mm (0.008 inch)    

0.20 mm (0.008 inch)    

0.20 mm (0.008 inch)    
Total Indicator Runout (max)    
0.05 mm (0.002 inch)    

0.05 mm (0.002 inch)    

0.05 mm (0.002 inch)    

0.05 mm (0.002 inch)    

0.05 mm (0.002 inch)    
Brush (3):    
Length (new)    
20.5 mm (0.81 inch)    

20.5 mm (0.81 inch)    

20 mm (0.79 inch)    

20.5 mm (0.81 inch)    

20 mm (0.79 inch)    
Length (min)    
13 mm (0.51 inch)    

13 mm (0.51 inch)    

14 mm (0.55 inch)    

13 mm (0.51 inch)    

14 mm (0.55 inch)    
Torques:    
Battery Terminal Nut (4)    
17.6 N·m (157 lb in)
to

24.5 N·m (218 lb in)    

17.6 N·m (157 lb in)
to

24.5 N·m (218 lb in)    

22.5 N·m (200 lb in)
to

29.4 N·m (262 lb in)    

22.5 N·m (200 lb in)
to

29.4 N·m (262 lb in)    

22.5 N·m (200 lb in)
to

29.4 N·m (262 lb in)    
Ground Terminal Nut (5)     None     None    
22.5 N·m (200 lb in)
to

29.4 N·m (262 lb in)    

19.6 N·m (174 lb in)
to

29.4 N·m (262 lb in)    

22.5 N·m (200 lb in)
to

29.4 N·m (262 lb in)    
Switch Terminal Screw (7)    
1.45 N·m (12.9 lb in)
to

1.95 N·m (17.4 lb in)    

1.45 N·m (12.9 lb in)
to

1.95 N·m (17.4 lb in)    

2.0 N·m (18 lb in)
to

2.5 N·m (22 lb in)    

2.0 N·m (18 lb in)
to

2.5 N·m (22 lb in)    

2.0 N·m (18 lb in)
to

2.5 N·m (22 lb in)    
Motor Terminal Nut (9)    
17.6 N·m (157 lb in)
to

29.4 N·m (262 lb in)    

17.6 N·m (157 lb in)
to

29.4 N·m (262 lb in)    

17.6 N·m (157 lb in)
to

29.4 N·m (262 lb in)    

17.6 N·m (157 lb in)
to

29.4 N·m (262 lb in)    

17.6 N·m (157 lb in)
to

29.4 N·m (262 lb in)    
Through Bolts (2)    
6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

9.8 N·m (87 lb in)
to

16.7 N·m (149 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

9.8 N·m (87 lb in)
to

16.7 N·m (149 lb in)    
Solenoid Cover Bolts (8)    
6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    

6.9 N·m (61 lb in)
to

11.8 N·m (105 lb in)    
Drive Housing Screws (6)    
2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

2.6 N·m (23 lb in)
to

4.6 N·m (41 lb in)    

Caterpillar Information System:

Generator Set Control Panel for Switchgear Conversion Warning Operation
3612 and 3616 Engines Engine Oil Filter Housings - Disassemble
3408E and 3412E Engines for Caterpillar Built Machines Unit Injector Hydraulic Pump - Remove
3408E and 3412E Engines for Caterpillar Built Machines Unit Injector Sleeve - Remove
G3408 and G3412 Engines Air Starting Motor
Generator Set Control Panel for Switchgear Conversion Service Tools
3408E and 3412E Engines for Caterpillar Built Machines Unit Injector Hydraulic Pump Drive - Assemble
Generator Set Control Panel for Switchgear Conversion Engine Shutdown
Generator Set Control Panel for Switchgear Conversion Engine Overspeed
Generator Set Control Panel for Switchgear Conversion Engine Overspeed - Adjust
G3606 and G3608 Engines Engine Oil Filter Housings - Install
3408E and 3412E Engines for Caterpillar Built Machines Unit Injector - Install
3612 and 3616 Engines Engine Oil Filter Housings - Assemble
Generator Set Control Panel for Switchgear Conversion Normal Mode
3408E and 3412E Engines for Caterpillar Built Machines Unit Injector Hydraulic Pump - Install
Generator Set Control Panel for Switchgear Conversion Harness Code Mode
3406E Truck Engines Electrical Ground Stud
3408E and 3412E Engines for Caterpillar Built Machines Unit Injector Sleeve - Install
3412E and C30 Marine Engines Information Plate
3054 Engine Valve Mechanism Cover
3612 and 3616 Engines Engine Oil Filter Elements - Remove and Install
Generator Set Control Panel for Switchgear Conversion Service Mode
G3606 and G3608 Engines Engine Oil Pan - Remove
3054 and 3056 Industrial and Generator Set Engines Cylinder Head Valves
Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.