Electric Starting Motor
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Illustration 1 | g00553157 |
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. |
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Illustration 2 | g00553165 |
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. |
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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     |
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( 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.
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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)     |
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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)     |
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