MOTOR GP-PISTON 2029940 - Caterpillar

Illustration 1 g00719273
Rest position (1) Return spring (2) Solenoid assembly (3) Pull-in winding (4) Start terminal "S" (5) Hold-in winding (6) Battery terminal "Bat" (7) Key start switch (8) Solenoid contacts (9) Motor terminal "Mtr" (10) Shift lever assembly (11) Field winding assembly (12) Pinion drive assembly (13) Pinion (14) Armature assembly (15) BatteryA DC series wound motor is used as the starting motor. The starting motor has a field winding assembly (11). The starting motor has an armature assembly (14). The excitation windings and the armature windings are connected in series. The pinion end of the armature shaft has splines for the pinion drive assembly (12) .The solenoid assembly (2) is an integral part of the starting. The assembly has a pull-in winding (3) and a hold-in winding (5). The shift lever assembly (10) fits in the solenoid plunger slot. There is a small amount of free play between the shift lever assembly (10) and the solenoid plunger. This free play allows return spring (1) to pull the solenoid plunger back to the initial position. The movement turns the starter off. The electrical connection is quickly broken at the solenoid contacts (8). The connection is quickly broken in order to turn off the starting motor if the engine is not started.The pinion drive assembly (12) contains a pinion (13) and an overrunning clutch. The pinion drive assembly (12) engages the helical spline of the armature shaft. The pinion drive assembly is coupled to pinion (13) with an overrunning clutch. The drive has two guide rings or discs which are engaged with the forked end of shift lever assembly (10). The shift lever assembly (10) moves the drive along the armature shaft. A meshing spring separates the guide ring from the overrunning clutch portion of pinion drive assembly (12). The spring allows the shift lever assembly to move against the stop. As a result, the starting motor current is always turned on. The current is on even if the flywheel is not engaged by the pinion. The pinion drive assembly and pinion (13) are moved by the shift lever assembly axially until the pinion reaches the stop position. The helical spline prevents torque from being applied to the engine until the pinion is fully meshed. The overrunning clutch portion of pinion drive assembly (12) transmits the force of the starting motor armature to the engine flywheel after pinion (13) is fully meshed. The pinion drive assembly (12) breaks the connection immediately after the engine speed exceeds the speed of the starting motor.
Illustration 2 g00719279
Partial engagement (1) Return spring (2) Solenoid assembly (3) Pull-in winding (4) Start terminal "S" (5) Hold-in winding (6) Battery terminal "Bat" (7) Ignition switch (8) Solenoid contacts (9) Motor terminal "Mtr" (10) Shift lever assembly (11) Field winding assembly (12) Pinion drive assembly (13) Pinion (14) Armature assembly (15) BatteryUpon closing the switch (7), the pull-in winding (3) is energized and the hold-in winding (5) is energized. The solenoid armature pulls the shift lever assembly (10)