BRACKET 3975140 - Caterpillar

Illustration 1 g00583663
Starting Motor Components (1) Housing (2) Armature (3) Brushes (4) Brush holder (5) Case of the starting motor (6) Frame (7) Armature reduction gear (8) Idler reduction gear (9) Field winding (10) Overrunning clutch gear (11) Pinion gear (12) Overrunning clutch (13) Solenoid switchThe major components of the reduction starting motor are the following items:
Case of the starting motor (5)
Field winding (9)
Armature (2)
Brushes (3)
Brush holder (4)
Gears (7), (8) and (10)
Pinion gear (11)
Overrunning clutch gear (12)
Solenoid switch (13) The reduction starting motor operates differently than the conventional starting motor. Solenoid (13), overrunning clutch gear (12) and pinion gear (11) are mounted below armature (2) and field winding (9). When the starting motor is activated, armature reduction gear (7) will turn clockwise. Idler reduction gear (8) will turn counterclockwise and overrunning clutch gear (10) with pinion gear (11) will turn clockwise. The reduction gears (7) and (8) reduce the speed of the armature. The speed of the armature is reduced by 25 percent to 33 percent of the pinion gear (11).
Illustration 2 g00583704
Field Winding And Case Of The Starting Motor (5) Case of the starting motor (9) Field winding The case of the starting motor (5) supports the field winding (9), the brush holder and the brushes. The two positive brushes are welded to the field winding leads. Field winding (9) provides the magnetic field for the armature.
Illustration 3 g00583707
Armature (2) Armature. Armature (2) consists of a laminated iron core which is assembled on the armature shaft. The commutator is at one end of the armature. The commutator is constructed with segmented bars of copper. The segmented bars are insulated from each other and the armature shaft. The armature windings are wound in the slots of the core. The windings are then connected to the commutator segments. Bearings support the armature and the field winding in the case of the starting motor. The armature and the field winding are connected in series. The equal current flow generates high torque especially when the motor is first started.
Illustration 4 g00583770
Brush Holder (3) Brushes (4) Brush holder (14) Brush springs Brush holder (4) is mounted over the commutator to the case of the starting motor. Four brushes are held against the commutator. Brush springs (14) keep pressure on the brushes so the brushes stay in contact with the commutator. Brushes (3) are made of carbon which is a good conductor of electricity. The brushes transmit current from the field winding to the commutator. There are four brushes. Two of the brushes are positive. The positive brushes are welded to the field winding leads. Two of the brushes are negative. The negative brushes are grounded to the case.
Illustration 5 g00583773
Overrunning Clutch (10) Overrunning clutch gear (11) Pinion gear (12) Overrunning clutch
Illustration 6 g00583774
Overrunning Clutch Components (10) Overrunning clutch gear (11) Pinion gear (12) Overrunning clutch (15) Clutch roller (16) Roller springThe overrunning clutch consists of the following items:
Pinion gear (11)
Overrunning clutch gear (10)
Clutch rollers (15)
Roller springs (16)
Ball bearingsThe outer