EPC Parts Catalogs

37-MT, 41-MT, and 42-MT Series Starting Motors Starting Motor - Disassemble - 42-MT Caterpillar


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Starting Motor - Disassemble - 42-MT
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37-MT, 41-MT, and 42-MT Series Starting Motors [SENR3581]
37-MT, 41-MT, and 42-MT Series Starting Motors Starting Motor - Assemble - 37-MT and 41-MT
37-MT, 41-MT, and 42-MT Series Starting Motors Starting Motor - Assemble - 42-MT
ELECTRICAL AND STARTING SYSTEM
STARTING MOTOR GP
37-MT, 41-MT, and 42-MT Series Starting Motors Starting Motor
37-MT, 41-MT, and 42-MT Series Starting Motors Component Description
37-MT, 41-MT, and 42-MT Series Starting Motors Normal Operation
37-MT, 41-MT, and 42-MT Series Starting Motors No Load - Test
37-MT, 41-MT, and 42-MT Series Starting Motors Starting Motor - Disassemble - 37-MT and 41-MT
37-MT, 41-MT, and 42-MT Series Starting Motors Engine Does Not Crank with Starting Motor On and Pinion Engaging Ring Gear
37-MT, 41-MT, and 42-MT Series Starting Motors Brush and Brush Holder - Check
1.1. Disassemble the Starting Motor

Disassemble the Starting Motor

Note: The disassembly and assembly that follows is of the 24 volt starting motor. The 12 volt is similar.

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Table 1
Required Tools    
Tool     Part Number     Part Description     Quantity    
A     1P-1855     Retaining Ring Pliers     1    
B     1P-0510     Driver Gp     1    
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    Illustration 1g00810559

  1. Disconnect wire assembly (4) from solenoid (1). Disconnect motor terminal connector (3) from the starting motor housing.

  1. Remove three bolts (2) from the shift lever housing. Do not disassemble the solenoid. The parts inside the solenoid are not serviceable.
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    Illustration 2g00818016

  1. Remove the O-ring seal and bushing (5) .
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    Illustration 3g00810580

  1. Remove the nut (6). Remove the solenoid from the shift lever housing.
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    Illustration 4g00810574

  1. Remove the negative terminal nuts "-", wire assembly (2), and washers. Remove six bolts (8) and rear housing (7) .
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    Illustration 5g00818558

  1. If necessary, remove bushing (9) from the rear housing.
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    Illustration 6g00810576

  1. Remove washer (12) from the armature shaft. Lift brush springs (10) and pull the brushes away from the commutator. Position the brush springs (10) on the side of the brushes in order to hold the brushes in the holders.

  1. Disconnect field winding leads (13) from brush holder (11). Remove the brush holder.
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    Illustration 7g00818538

  1. Remove brushes (15) and negative "-" terminal (14) from the brush holders.
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    Illustration 8g00810579

  1. Scribe a line on the pinion drive, the shift lever and the starting motor housings for the correct alignment at assembly.

  1. Remove six bolts (17) and pinion drive housing (16) .
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    Illustration 9g00810582

  1. Remove retainer (18) with tool (A). Remove shift lever pin (20). If necessary, remove the O-ring seals from the shift lever pin.

  1. Remove pinion drive (19) and the shift lever.
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    Illustration 10g00810585

  1. Remove the brake disc from the armature shaft. Remove five bolts (22), shift lever housing (21) and the washer. If necessary, remove the outside O-ring seals.

  1. If necessary, remove the seal and the bushing from the shift lever housing.
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    Illustration 11g00810588

  1. Remove armature (22) from the starting motor housing.
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    Illustration 12g00810589

  1. Remove the following components from the starting motor housing: eight screws (26), pole shoes (25) and field winding coil (24). It may be necessary to use an impact driver to remove screws (26) .

  1. Clean the armature, field winding coil and pinion drive with mineral spirits and a brush.

    Note: If the commutator is dirty, the commutator may be cleaned with Number 00 sandpaper. Do not use emery cloth.

  1. Inspect all parts for wear and damage.

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