41-MT Starting Motors

The identification tag on the starting motor displays two numbers: Part Number and Consist Number. The Part Number is used to order a complete starting motor. The Consist Number is used for identifying the specific starting motor and acquiring serviceable parts for the starting motor. In some cases, the Caterpillar part number and the Caterpillar consist number are identical.

Table 3
41-MT Part Numbers    
Part Number     Consist Number     Replaced By     Serviced By    
106-8558     106-8559     207-1517     –    
131-1275     131-1275     207-1514     –    
143-8434     143-8434     207-1519     –    
150-4247     150-4247     207-1516     –    
168-3499     168-3499     –     –    
177-4715     177-4715     207-1513     177-4715    
204-9742     204-9742     –     –    
207-1513     207-1513     –     –    
207-1514     207-1514     –     –    
207-1516     207-1516     –     –    
207-1517     207-1517     –     –    
207-1519     207-1519     –     –    
9X-9995     3E-2298     106-8558     –    

Illustration 3 g00782868

41-MT Typical cross section view

(1) Nut (Battery)

(2) Solenoid Mounting Screws

(3) Pinion

(4) Pinion Drive Housing Bolts

(5) Shift Lever Housing Bolts

(6) Field Winding Screws

(7) Laminated Core

(8) Rear Housing Bolts

(9) Brush

(10) Commutator

(11) Brush Lead Screws

(12) Motor Terminal Bolt

(13) Motor Terminal Nut

Illustration 4 g00801361

41-MT Typical end view

(1) Nut (Battery)

(12) Bolt (Motor Terminal)

(13) Motor Terminal Nut

(14) Nut (Terminal)

(15) Ground Terminal Nut

 

Table 4
41-MT Complete Starting Motor Specifications    
Rated Voltage:     12 V     24 V    
Solenoid Winding     Pull-In Resistance (1)     0.11 to 0.15 Ohms     0.43 to 0.49 Ohms    
Hold-In Resistance (1) 0.50 to 0.59 Ohms     1.37 to1.77 Ohms    
Pull-In Current  (1) 92.5 ± 7.5 Amp at 10 V     56.5 ± 4.5 Amp at 20 V    
Hold-In Current  (1) 23 Amp at 10 V     14.6 Amp at 20 V    
No-Load Test     Voltage     11.0 V     23.0 V    
Current 127.5 ± 27.5 A     65.0 ± 15.0 A    
Speed 7018 ± 1517 rpm     8450 ± 1250 rpm    
Load Test (2)     Voltage     9.0 V     18.0 V    
Current 1400 A     750 A    
Speed 1200 rpm     1500 rpm    
Commutator (5)     Diameter     54.0 mm (2.13 inch)     54.0 mm (2.13 inch)    
Diameter (min) 51.9 mm (2.04 inch)     51.9 mm (2.04 inch)    
Depth Of Insulation Between Commutator Bars (min) The insulation cannot be undercut.     0.64 mm (.025 inch)    
Total Indicator Runout (max) 0.13 mm (0.005 inch)     0.13 mm (0.005 inch)    
Pinion (12)     Clearance     4.57 ± 0.76 mm (0.18 ± 0.03 inch)     4.57 ± 0.76 mm (0.18 ± 0.03 inch)    
Brush (6)     Length  (3)     23.0 mm (0.91 inch)     23.0 mm (0.91 inch)    
Length  (4) 10.0 mm (0.39 inch)     10.0 mm (0.39 inch)    
Laminated Core (8)     Total Indicator Runout (max)     0.13 mm (0.005 inch)     0.13 mm (0.005 inch)    
Torques     Nut (Battery) (1)     30 ± 3 N·m (22 ± 2 lb ft)     30 ± 3 N·m (22 ± 2 lb ft)    
Solenoid Mounting Screws (2) 17.8 ± 3.7 N·m (13 ± 3 lb ft)     17.8 ± 3.7 N·m (13 ± 3 lb ft)    
Pinion Drive Housing Bolts (4) 23.7 ± 6.1 N·m (17 ± 4 lb ft)     23.7 ± 6.1 N·m (17 ± 4 lb ft)    
Shift Lever Housing Bolts (5) 18.9 ± 2.6 N·m (14 ± 2 lb ft)     18.9 ± 2.6 N·m (14 ± 2 lb ft)    
Field Winding Screws (6)  (5) 20.3 ± 2.3 N·m (180 ± 20 lb in)     20.3 ± 2.3 N·m (180 ± 20 lb in)    
Rear Housing Bolts (8) 5.7 ± 1.1 N·m (4 ± 1 lb ft)     5.7 ± 1.1 N·m (4 ± 1 lb ft)    
Brush Lead Screws (12) 2.9 ± 1.0 N·m (26 ± 9 lb in)     2.9 ± 1.0 N·m (26 ± 9 lb in)    
Motor Terminal Bolt (13) 9.6 ± 1.1 N·m (7.1 ± 0.8 lb ft)     9.6 ± 1.1 N·m (7.1 ± 0.8 lb ft)    
Motor Terminal Nut (14)  (6) 14.7 ± 3.4 N·m (10.8421 ± 2.5077 lb ft)     14.7 ± 3.4 N·m (10.8421 ± 2.5077 lb ft)    
Nut (Terminal) (15) 2.6 ± 0.8 N·m (1.9 ± 0.6 lb ft)     2.6 ± 0.8 N·m (1.9 ± 0.6 lb ft)    
Ground Terminal Nut (11) 30.5 ± 3.5 N·m (22 ± 2.5 lb ft)     30.5 ± 3.5 N·m (22 ± 2.5 lb ft)    

( 1 ) Measured at 20 °C (68 °F)
( 2 ) Measured at 27 °C (81 °F)
( 3 ) New brush
( 4 ) Minimum brush length
( 5 ) Put 9S-3263 Thread Lock on the threads of screws (11) before installation.
( 6 ) Hold the terminal with 1U-8007 Torxalign bit and 1U-7182 Ratchet while nut (14) is being tightened.

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