CORE AS- 2745095 - Caterpillar

M105R Starting Motors
The identification tag on the starting motor displays two numbers: Part Number and Consist Number.Part Number - Used to order a complete starting motorConsist Number - Used for identifying the specific starting motor and acquiring serviceable parts for the starting motorNote: In some cases, the Caterpillar part number and the Caterpillar consist number are identical.
Table 1
M105R Part Numbers    
Part Number    Description    Model    
390-0787     Electric Starting Motor Gp     950H, 962H    
Table 2
M105R Starting Motor Specifications    
Title    Description    Rated Specification    
No Load Test     Speed     3000 rpm minimum    
Current 130 A maximum    
Voltage 24 V    
Load Test     Speed     1100 rpm    
Current 700 A maximum    
Voltage 19 V    
Torque 45 Nm minimum    
Stall Torque Test     Speed     1100 rpm    
Current 2000 A maximum    
Torque 180 Nm minimum    
Solenoid Winding     Pull-In Resistance     0.0738 5% Ohms    
Hold-In Resistance 1.3 5% Ohms    
Pinion Clearance         12 mm (0.476 inch)    
Brushes     Original Length    
21.75 0.25 mm (0.86 0.01 inch)    
Commutator     Original Armature Diameter    
39 mm (1.54 inch)    
Table 3
Relay Specifications    
Coil Data     Nominal Exciting Current     1.5 A    
Resistance 16.95 5% Ohms    
Pull-in Voltage Max 16 V    
Hold-in Voltage Max 8 V    
Contact Data     Current Rating     300 A    
Max Current Inrush 500 A    
Voltage Drop 100 mV (100 A)    
Environment     Operating Temperature    
−40° C (−40° F) through
105° C (221° F)    
Sealing Rating IP67    
Table 4
Torque Specification    
Solenoid Mounting Bolt    
14 1 N m (123.9 8.9 lb in)    
Rear Housing Bolts    
14 1 N m (123.9 8.9 lb in)    
Negative Terminal Nut    
26.1 1.4 N m (231 12 lb in)    
Motor Terminal Nut ("Mtr")    
26.1 1.4 N m (231 12 lb in)    
JSP Cover Screw    
5 1 N m (44.3 8.9 lb in)
   
Hexagon Flange Nut    
7 1 N m (62 8.9 lb in)    
Solenoid Terminal Nut    
2.1 0.3 N m (18.6 2.7 lb in)    
Lead Mounting    
3.5 0.5 N m (31 4.4 lb in)    
IMS 50 C Terminal    
2 N m (18 lb in) -
2.5 N m (22 lb in)    
Battery ("BAT") Terminal    
25 1 N m (18 1lb ft)    
Ground Terminal    
25 1 N m (18 1lb ft)    
M10 Mounting Bolts for SAE flange    
55 10 N m (40.6 7.4 lb ft)    
Integrated Magnetic Switch (IMS) Mounting    
8 1 N m (71 9 lb in)