42-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 5
42-MT Part Numbers    
Part Number     Consist Number     Replaced By     Serviced By    
104-5724     104-5724     3T-2648     –    
104-6547     104-5725     207-1535     3T-2648    
104-7041     104-7042     –     6V-5539    
104-7044     104-7044     –     6V-5795    
106-8553     106-8553     207-1548     –    
106-8555     6V-5207     207-1554     6V-5227    
120-8967     120-8898     –     –    
128-3172     128-3172     –     –    
145-2413     145-2413     –     –    
146-3503     146-3503     207-1521     –    
150-8750     150-8750     –     –    
151-8090     151-8090     –     –    
156-5461     156-5461     –     6V-5227    
165-4619     165-4619     –     –    
193-9185     193-9185     –     –    
193-9186     193-9186     –     –    
198-7746     207-1521     –     207-1521    
200-6962     200-6962     –     –    
200-6963     200-6963     –     –    
207-1520     207-1520     –     207-1532    
207-1522     207-1522     –     207-1525    
207-1523     207-1523     –     –    
207-1524     207-1524     –     –    
207-1525     207-1525     –     –    
207-1527     207-1527     –     –    
207-1529     207-1529     –     207-1525    
207-1531     207-1531     –     207-1525    
207-1532     207-1532     –     –    
207-1533     207-1533     –     –    
207-1535     207-1535     –     207-1533    
207-1537     207-1537     –     207-1524    
207-1539     207-1539     –     –    
207-1541     207-1541     –     207-1551    
207-1542     207-1542     –     207-1560    
207-1543     207-1543     –     207-1560    
207-1545     207-1546     –     207-1545    
207-1547     207-1547     –     –    
207-1548     207-1548     –     207-1558    
207-1549     207-1549     –     207-1556    
207-1551     207-1551     –     –    
207-1552     207-1553     –     207-1560    
207-1554     207-1555     –     207-1560    
207-1556     207-1557     –     –    
207-1558     207-1558     –     207-1560    
207-1560     207-1561     –     207-1560    
207-1562     207-1562     –     207-1558    
207-1564     207-1564     –     207-1556    
3E-7863     3E-7863     201-1524     –    
3E-7864     3E-7864     207-1531     6V-3948    
3E-8845     3E-8845     –     8C-4090    
3T-2646     8C-3645     6V-4246     6V-5539    
3T-2648     8C-3646     –     –    
3T-2648     104-5724     207-1533     –    
3T-2650     8C-3649     207-1549     6V-5539    
3T-2652     8C-3647     207-1558     6V-5227    
3T-2655     8C-3648     207-1529     –    
3T-2657     8C-3643     207-1527     –    
3T-2764     8C-3594     6V-4641     –    
3T-4586     8C-3650     207-1552     6V-5227    
4N-3181     8C-3651     6V-5227     –    
4Q-5708     4Q-5708     128-3172     –    
4Q-5709     4Q-5709     –     –    
4Q-5739     4Q-5739     –     4Q-5708    
5R-7873     5R-7873     –     6V-5227    
6N-1889     8C-3644     207-1564     –    
6V-3948     6V-3969     207-1525     –    
6V-4031     6V-4031     –     –    
6V-4213     6V-4213     207-1532     –    
6V-4214     6V-4214     207-1523     –    
6V-4215     6V-4215     –     6V-3948    
6V-4215     6V-4215     6V-3948     –    
6V-4246     106-8551     207-1562     6V-5539    
6V-4451     6V-4458     207-1543     6V-5227    
6V-4641     6V-4646     207-1545     6V-4641    
6V-5207     6V-5207     6V-5227     –    
6V-5227     6V-5537     207-1560     6V-5227    
6V-5539     106-8554     207-1556     –    
6V-5795     6V-5795     –     –    
6V-5821     6V-5821     –     –    
8C-3592     8C-3592     207-1537     3E-7863    
8C-3593     8C-3593     207-1520     6V-4213    
8C-3595     8C-3595     6V-4214     –    
8C-3596     8C-35960     207-1522     6V-3948    
8C-3597     8C-3597     104-7044     6V-5795    
8C-4090     8C-4090     207-1547     –    
8Q-1863     8Q-1863     –     –    
8T-9685     8T-9685     106-8553     –    
9G-4339     9G-4339     207-1542     –    
9W-0058     9W-0058     3E-7864     6V-3948    

 


Illustration 5 g00801373

42-MT 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) Brush

(9) Commutator

(10) Ground Terminal Nut

(11) Brush Lead Screws

(12) Rear Housing Bolt

(13) Motor Terminal Bolt

(14) Motor Terminal Nut

Illustration 6 g00801384

42-MT End View

(1) Nut (Battery)

(10) Ground Terminal Nut

(13) Bolt (Motor Terminal)

(14) Motor Terminal Nut

(15) Nut (Terminal)

Table 6
42-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) 0.5 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     67.5 ± 7.5 A    
Speed 6900 ± 1800 rpm     7643 ± 1683 rpm    
Load Test (2)     Voltage     9.0 V     18.0 V    
Current 1400 A     750 A    
Speed 1200 rpm     1200 rpm    
Commutator (6)     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 (0.025 inch)    
Total Indicator Runout (max) 0.13 mm (0.005 inch)     0.13 mm (0.005 inch)    
Pinion (12)     Clearance     9.1 ± 0.8 mm (0.36 ± 0.03 inch)     9.1 ± 0.8 mm (0.36 ± 0.03 inch)    
Brush (7)     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 Bolts (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 (12) 5.7 ± 1.1 N·m (4 ± 1 lb ft)     5.7 ± 1.1 N·m (4 ± 1 lb ft)    
Brush Lead Screws (11) 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 (10) 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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